• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A control circuit of a fuel management control system for internal combustion engines monitors the operation of an exhaust line sensor. When the oxygen sensor is perceived to be inoperative, for example, due to low ambient temperature, the previously closed loop control process governing the fuel management control signals is interrupted and a direct forward control process is substituted therefor. The reference voltage is changed during this time for eventual adaptation to the changeover to closed loop feedback control after the oxygen sensor again becomes operational.
    公开号:SU1005668A3
    申请号:SU762343765
    申请日:1976-04-14
    公开日:1983-03-15
    发明作者:Херт Харро；Шнюрле Ханс；Древс Ульрих；Зингер Эрих；Краус Бернд；Вернер ПЕТЕР
    申请人:Роберт Бош Гмбх (Фирма)；
    IPC主号:
    专利说明:

    device, and the value of the reference signal is constantly higher than the limit value of the lean mixture signal from the exhaust gas sensor. The reference signal is lowered during periods when the lean mixture signal is applied from the exhaust gas sensor. The reduction of the desired reference signal is initially set in accordance with the engine load and is blocked from decreasing during the formation of control pulses from a correction device, or the value of the reference signal is reduced abruptly after switching to the formation of control pulses from the exhaust gas composition sensor. FIG. 1 shows a block diagram of a part of an electronic fuel injection control system implementing the proposed control method; in fig. 2 is an electrical diagram of a part of the electronic system of FIG. one; in fig. 3 - part of the electronic system, located to the left of FIG. 2; in fig. 4 — graph of the change in the internal resistance and capacitance of the exhaust gas sensor depending on temperature; in fig. 5 shows voltage variation in the elements of the system: in FIG. 6 shows an embodiment of the system in FIG. 7 is a graph of voltage variations in the elements of the system of FIG. 6. The proposed method of controlling the supply of fuel to the internal combustion engine is carried out by an electronic control system (Fig. 1) containing an exhaust gas composition sensor 1 installed in the exhaust pipe (not shown) connected to the input of the comparison circuit 2 and producing a signal 3 having limits for enriched and depleted mixture, an integration circuit 4, the output of which is connected to a computing unit equipped with a rotation sensor (not shown, and a correction device formed by consequently included the first 5 and second 6 delay circuits. The input of the first 5 delay circuits is connected to the output of the comparison circuit 2, and the output is connected to the auxiliary input 7 of the integration circuit 4, and the output of the second 6 delay circuits is connected to the additional input 8 of the circuit 2. Circuit 5 (see Fig. 2) is made in the form of Miller integrator, containing the first 9 and second Yu transistors and a capacitor 11, connecting the input and output of the integrator, and is equipped with an emitter follower formed by the third transistor 12 installed at the input, and the fourth transistor located at the output ohm 13. The third transistor 12 with its collector directly below10 84 is connected to the positive pole 14, the base through the resistance 15 is connected to the emitter, which is connected to the base of the transistor 9 through series-connected resistances 16 and 17 whose emitter is connected to the base of the transistor 10 and through the resistance 19 is connected to the negative pole 18, and the collector is connected to the positive pole 14 via the co-stimulation 20. The emitter of the transistor 10 is connected directly to the negative pole 18, and its collector through resistance 21 - with a positive pole 14 and through series-connected resistances 22 and 23 - with a negative pole 18. To the common point of resistances 22 and 23 is connected the base of the transistor 13, the emitter of which is directly connected to the negative pole 18, and the collector through the resistance 24 - to the positive pole 14. The output of the first circuit 5. through the diode 25 is connected to the input of the second circuit 6, also made in the form of Miller's integrator, formed by the fifth and sixth transistors 26 and 27 and the second capacitor 28. The base of the transistor 26 is connected through resistance 29 to the diode 25, and its collector - via a resistance 30 - to positive 14, and the emitter - to the base of transistor 27 and through resistance 31 to a negative pole 18. Circuit 14 has the first operational amplifier 32, which through adjustable resistors 33 and 34 and a diode 35 is connected to the collector of the fourth transistor 13. Circuit 2 has a second operational amplifier (see FIG. 3) and two transistor amplifier stages formed by transistors 37 and 38, whose emitters are, respectively, but through resistances 39 and 40 are connected to the inverting and non-inverting inputs 41 and 42 of the second operational amplifier 36. Circuit 2 also has a reference voltage source made in the form of a Zener diode 43, connected in series with two resistances 44 and 45 and in parallel with the first resistance 46, connected in series with adjustable in parallel switched-on resistances 47 and 48 and silicon diode 49. Output 50 V The second operational amplifier 36 is connected to the output 51 of the circuit 2 and is simultaneously connected via diode 52 and resistance 53 and 54 with the output wire 55 and emitter of the seventh transistor 56, the base of which is connected via resistance 57 to the Zener diode 43, and the collector to the positive pole 14 Simultaneously base of the seventh transistor
    56 through the resistances 58 and 59 are connected respectively to the inputs 41 and 42 of the second otipation amplifier 36.
    The base of the transistor 37, forming the first amplifying stage, through a resistance 60 and a low-pass filter formed by inductance 61 and connected to the negative pole 18 by a capacitor 62, is connected to input 63 connected to exhaust gas sensor 1, and the base of transistor 38 is connected to an additional input 8, which is connected via wire 64 to the output of the second delay circuit 6. The lead wire 55 through the resistance 65 is connected to the collector of the sixth transistor 27. The base of the transistor 38. is connected through the resistance 66 to the common point of the first resistance 46 and adjustable resistances 47 and 48.
    The comparison circuit 2 has an eighth transistor 67, the emitter of which through wire 68 is connected to the lead wire 55, the base through diode 69, the resistance 70 and wire 71 to the collector of the fourth transistor 13, and the collector of transistor 67 is connected to the negative pole 18 through sequentially connected resistances 72 and 73, the common point of the latter being connected through series-connected resistances 74 and diode 75 to the base of transistor 37 and such a
    Thus, with the input 63 of the circuit 2. Simultaneously, the collector of the eighth transistor 67 through adjustable resistors 7i6 and 77 and the diode 78 is connected to the wire 79 connected to the common base point of the transistor 38 and the additional input 8. The common point of the resistances 44 and 45 are connected in series with The Zener diode 43 is connected to the inverting input 41 via the resistance 80, and the common resistance point 53 and 54 connecting the output of the second operational amplifier 36 to the output wire 55 is connected to the non-inverting input 42 via an additional resistance 81.
    The base of the third transistor 12 through the diode
    82 is connected to 51 of the comparison circuit 2, and a capacitor is connected in parallel with the emitter-base circuit of the first transistor 9.
    83 large capacity.
    The integration circuit 4 is provided with two input transistors 84 and 85 of different conductivity, the bases of which are connected to the output 51 and, thus, to the output 50 of the second operational amplifier 36, the collectors are interconnected through resistance blocks 86 and 87 formed by the respective adjustable resistance 88 , 89 and 90, 91, and the inverting input 92 of the first operative amplified 32 through a resistance 93 is connected to a common point of blocks 86 and 87 and through a resistance 94 and a diode 95 with a collector of the fourth transistor 13. Circuit 4 has the ninth transient The stop 96, the base of which through diode 97 and the resistance 98 is connected to the input 99, connected to the output of the high-speed rotation sensor, and the zmitter-collector junction of the transistor 96 has adjustable resistance 100 and is connected to the input transistors 84 and 85. The circuit 4 integration is also provided with a tenth transistor 101, the base of which through a resistance 102 and a low-pass filter formed by induction 103 and a capacitor 104 is connected to an input 105 connected to the output of a rated load sensor (not shown), G1re in the system, and the collector of the transistor 101 through the diode 106 and in parallel connected adjustable resistances 107 and 108 are connected to the output of the first operational amplifier 32 and through, Daodo 109 and the resistance 1GO to the inverting input. The emitter of the tenth transistor 101 of the pulses 113 and 114 is connected to the positive 14 and negative 18 poles, respectively, through the resistances 115 n 116.
    The output of the Miller integrator formed by transistors 26 and 27 in the delay circuit 6 through parallel-connected adjustable resistances 117 and 118 and a series-connected diode 119 is connected to wire 64. The output of the first operational amplifier 32 through adjustable resistances 120 and 121 to diode 122 is connected to output terminal 123 connected to the BXOI computing unit through a resistance 124 to a positive pole 14, and through parallel-connected capacitors 125 and 126 to the inverting input 92. The base of the ten transistor 101 is connected to -negative pole 18 via a parallel-connected capacitor 127, the resistance 128 n diode 129, and the total point of the diode 25 and resistance 29 soeschshena through a resistance 130 to the negative terminal through a resistance 18 and 131. - a retractable wire 55.
    权利要求:
    Claims (5)
    [1]
    The comparison circuit 2 is provided with an input terminal 132, connected, for example, to the nominal load, and through a low-pass filter of inductance 133 | And a capacitor 134 connected in parallel, directly connected to the negative pole 18. Non-inverted input 111 of the first operational amplifier 32 through the resistance 112, 113 and 114 are connected to the emitters of the input transistors 84 and 85. The common emitter points of the latter and the resistive resistances 135 and 136 are connected to the base of transistor 38, which is also connected to the negative pole 18 through parallel-connected adjustable resistances 137 and 138. The base of transistor 37 is connected to the negative pole 18 through series-connected adjustable and unregulated resistances 139 and 140 and a parallel-connected capacitor 141 in parallel. Parallel to the alternator-base circuit of the first transistor 9, a series-connected diode 142 AND is connected a switch 143, the common point of which is connected through a resistance 144 to the output of the second operational amplifier 36. Method of regulating the supply of fuel to the internal combustion engine performed as follows. Under normal engine operating conditions, sensor 1 generates a signal 3, which indicates the composition of the exhaust gases and is changed, and the composition areas of the air-fuel mixture that is close to stoichiometric within / 100-700 m are generated. This signal is fed to input 63 of the circuit. Comparison and, passing a low-pass filter, is applied to the base of transistor 37, which provides a signal to the inverting input that corresponds to the signal from sensor 1. A non-inverting input 42 of the second one-amplifier 36 is given a constant signal th voltage of the transistor 38 which receives a signal from the source opornog voltage, ie, from a general point..; Zener diode 43 and resistance 44, and the compensation of the voltage variation as a function of temperature is provided by the first resistance 46 and adjustable resistances 47 and 48, which change their resistance value as a function of temperature, and adjustable resistances 137 and 138 by resistance 66. as the signal at the inverting input oscillates, and the signal at the non-inverting input has a constant value, then at the output 50 of the second operational amplifier 36 a signal appears with high variable voltage values, which Scheme 4 aets to integration. When the feed mixture is poor, the signal from transistor 9 has a lower potential, and amplifier 36 produces a high voltage output when the mixture is rich, produces (low voltage signal. The signal from amplifier 36 is fed to the base of transistor 84 and 85, and Depending on the magnitude of the signal, one of these transistors is conductive, as a result of which, through one of the resistance blocks 86 or 87 of the SRI, an inverting input 92 is given a signal, as a result of which the first operational amplifier produces an output voltage supplied Through adjustable resistances 120 and 121 and diode 122 to the output terminal 123. At this, the rates of change in the output voltage, both upwards and downwards, are controlled independently of each other. In this connection, the computing unit generates control pulses for electromatite nozzles that provide fuel injection in a variable quantity. When a high potential is produced at the output of the second operational amplifier 36, the transistor 85 becomes conductive, and the output voltage changes to the sides have a positive potential. When the engine is warm, the output of the second operational amplifier 36 is rapidly shifting from low to high and vice versa. However, when sensor 1 is cold, the second operational amplifier for a longer time has a low potential of the output voltage and the first and second delay circuits 5 and 6 provide the first operational amplifier 32 to operate. The existing low potential for a long time is approximately O (since sensor 1 cold), locking the transistor 12, and when locked; the transistors 9 and 10, the capacitor 11 is charged through the resistance 17 and the resistance 21, and with the selected characteristics of the resistances 17, 21, 22 and 24 and the capacitor 11 (approximately 2-5 s), the transistor 13 becomes conductive, due to which the collector, the potential drops to the potential of the negative pole 18. As a result, through the diode 95 and the resistance 94, the inverting input 92 is connected to the negative pole 18, the signal at the output of the first operational amplifier 32 rises, therefore the adjustable resistances 33 and 34 provide through the diode 35 with regulation output from the amplifier 32. Thus, the signal from sensor 1 during this time period does not control the integration circuit 4, but generates control pulses by means of a correction device formed by the delay circuits 5 and 6. This process occurs until sensor 1 assumes a working condition, as a result of which excessive enrichment of the mixture is prevented when the engine is cold. Simultaneously with the amplifier 32, a second delay circuit 6 is turned on, which causes a charge on the capacitor 28, which is connected through resistance 65 to the emitter 9 of transistor 56, which supplies a constant voltage to wire 55. At the same time, from the collector of transistor 27 through adjustable resistances 17 and 118 and the diode 119 is supplied to the base of the transistor 38. While the transistor 13 is locked, the diode 119 is also locked, therefore the signal from the second delay circuit 6 does not affect the operation of the comparison circuit 2. The magnitude of the stabilized voltage is controlled by a Zener diode 43, and transistor 56 operates as an emitter follower. The transistor 13 also provides a health signal to the eighth transistor 67, which includes the voltage divide, formed by the resistances 72 and 73, which increase the voltage at the base of the transistor 38. Thus, the transistor 67 is an auxiliary element, duplicating the second circuit 6 delays. Simultaneously from the common point of the voltage divider from the resistances 72 and 73, the current through the resistance and the diode 75 is supplied to the sensor 1. The resistances 72 and 73 are selected so that the maximum voltage of sensor 1 does not exceed the allowable value (in this case the diode 75 is locked) . It also improves the detection of current from sensor 1 compared to applying it only to the base of transistor 37. Resistances 130 and 140 compensate for the peaks of high voltages of sensor 1 when it is cold. The transistor 96 provides the peak of the operation of the integration circuit 4 synchronously with the motor rotation and, thus, provides control of the duration of the supply of the control pulse in accordance with the air flow. When a signal appears at the input 99, .to the transistor. 96 becomes conductive and at the same time the input transistors 84 and & 5 become wire with it, in connection with which the potentials at both inputs of the amplifier 32 become the same and the potential does not change at it. the output at which the control appears from the giap only when the non-conductive transistor 96. This ensures, when the engine is idling, the prevention of revolutions. The whole system has a short time constant in order to provide feed regulation according to the indication of sensor 1. But this time constant should not be so small that uncontrolled oscillations in the electric circuit do not occur. Resistance 100 provides the bias of the output voltage of the integrating circuit during a pulse pause. When the motor is operating at a nominal load, a signal is applied to the input 105, and 6810 through the transistor 10 is set at the inverting input 92 such potential that provides the output signal to the engine full power. what is needed to do so. that sensor 1 does not interfere with engine operation at rated load. When the engine is started, until the exhaust gas sensor 1 is heated up, the inclusion of the system through the capacitor 83 causes a short circuit effect on the base of the first transistor 9, as a result of which the transistors 9 and 10 become non-conductive regardless of other operating conditions, as a result, the transistor 13 becomes wire and the system turns on feed control as described above. This effect can be achieved without a capacitor 83, and with the help of a switch 143 and a diode 142 that connects the base of transistor 9 to the negative pole 18. At the same time, the switch 143 can be interlocked with an ignition lock (not shown). Control signals from various sensors, for example, measurements of the number of air, motor temperature and others, can be fed to the input terminal 132. At the same time, the control signal through inductance 133 and adjustable resistances 135 and 136 are fed to the base of transistor 38, therefore Provides the required fuel control. At the same time, adjustable resistances provide the required parameters for changing the fuel supply. The second operational amplifier 36, with feedback from the lead-in wire 55, through the resistance 81 has a feedback coefficient independent of the supply voltage level. I When the cold exhaust gas composition sensor 1 is heated by the current J passing through it decreases its internal voltage and the system starts working as described above, and the output potential of the second operational amplifier 36 jumps to a higher level. The start of the feed control process depends on the magnitude of the resistance 16. In this case, the switching of transistors 9 and 10 causes the eighth transistors 67 to be locked, the additional current supply to the sensor 1 is turned off and the threshold magnitude on the transistor 38 is increased via wire 64. In FIG. Figure 4 shows a plot of the internal resistance and the capacity of the exhaust gas sensor 1 as a function of time t or temperature. In this case, curve 145 shows the internal resistance of sensor 1, curve 146 is the supply voltage. From an external current source, curve 147 is the output voltage with the rich mixture, curve 148 is the output voltage for the lean mixture, and section 149 is the voltage on sensor 1, in the absence of current. As can be seen from FIG. 4, when the sensor 1 is cold, its internal resistance is large and its output voltages are determined by the supply voltage from the current source (curve 146). After warming up, i.e. after time t, sensor. 1 is switched on and its output voltage varies within curves 147 and 148, depending on the composition of the mixture, as the capacitance changes. When ego, voltage levels can range from 100 mV to 900 mV. FIG. Figure 5 shows a graph of voltage changes at sensor 1 and at the outputs of the op amp as a function of time when the engine is warming up. As can be seen from the graph, at time t. the voltage on the sensor 1 is fed to the input of the second, operational amplifier 36, which previously had a constant high value of about 1.1 V and is indicated by a segment 150. The voltage at the output of the amplifier 36 begins to decrease, since during adjustment the mixture was depleted, and for some period of time before the time was reduced by a small amount. This decrease is denoted by segment 151. For a period of time 12 - t xj, the mixture is enriched, and the formation of control pulses is carried out as indicated by sensor 1. Then the formation of control pulses from the correction device jHO occurs at a different voltage value of the reference signal at the output determined by the transistor 38, switched on from the delay circuit 6. This period is denoted by 152. 3aieM again sensor 1 switches the output voltage of amplifier 36 to a lower value. This decrease is denoted by segment 153. Thus, the process of regulating the supply of Togshiva according to the reading of sensor 1 and the reference signal from the correction device repeats until the output voltage at the output of the second operational amplifier (line 154) is approximately equal to 350 mV At the same time, the voltage on sensor 1 is always lower than the voltage at the output of amplifier 36. However, if there is a sharp decrease in the output voltage (below the voltage of the sensor 1 of the lean mixture), further signal attenuation is blocked, as the system signals the mix . The voltage at this time at the output of the first operational amplifier 32 is shown by the line 155. This allows the 10 812 to regulate the flow of the mixture within acceptable limits, and therefore the accuracy of the fuel control is improved. FIG. Figure 6 shows an embodiment of the system in which the latter has a sensor 1 with a steep change curve in the output voltage. In the system, the collector of the transistor 13 is additionally connected via diode 156 to the base of transistor 26, and diode 25 via diode 157 is connected to a blocking device formed by an adjustable voltage divider from resistors 158 and 159, the common point 160 of which is connected via diode 161 to the output of the second operational amplifier 36. Condensure 28 is connected to the collector of transistor 27 through diode 162. The common point of capacitor 28 and diode 162 is connected to collector of transistor 27 through capacitor 163 and is directly connected to common point 164 of resistances 165 and 166 the first of which is connected to the lead wire 55, and the second through diode 167 to the collector of transistor 13. The collector of transistor 27 is connected through diode 168 to common point 169 of the voltage divider of resistances 170 and 171 connected between wire 55 and negative pole 18 The common point 169 is through a diode 172 and the resistance 173 is connected to terminal 174. This system operates as follows Before the adjustment process using a reference signal from a correction device, the output of the second delay circuit through the collector of the transistor 27 is connected to positive potential, therefore, common point 164 accepts a negative potential and diode 162 is closed. Having a voltage difference between the collector of transistor 27 and its capacitor 28 charges the latter to the potential of the voltage divider of the resistances 165 and 166 until until the diode 167 becomes conductive due to the conductive state of the transistor 13. If then the switch to regulation occurs according to the sensor reading. I, then the input signal of the second delay circuit 6 becomes positive and the diode 167 is closed. Therefore, the second delay circuit on transistors 26 and 27 changes its output signal stepwise, diode 162 becomes conductive, and the potential on the collector of transistor 27 drops in steps to a voltage at a common resistance point 170 and 171 plus the voltage of the diode 162. The nature of the step change in voltage shown in the graph (FIG. 7), where the solid line 175 represents the voltage in the system of FIG. 6. Voltage jump 176 is a function of resistance 166, the smaller the latter, the greater the magnitude of the voltage drop. Codenser 163 serves as an enhanced interference protection. Thus, the proposed method of regulating the supply of TonniijBa to an internal combustion engine allows for improving the accuracy of the dosing of fuel supply to the engine. Claim 1. The method of controlling the supply of fuel to an internal combustion engine, which consists in measuring the composition of the exhaust gases and the number of revolutions by the sensor of the composition of the exhaust gases, generating a signal having limits for the enriched and lean mixture, form control pulses for the elec- tromagnetic nozzles and change the duration of the control pulses depending on the engine operating modes with the help of a correction device, which is indicated by the fact that, in order to improve the metering accuracy opliva signal from the exhaust gas composition sensor when it is inoperable due to thermal regime is working range after a predetermined period of time by blocking. and the formation of the control pulses is carried out from the corrective device which supplies the reference signal towards the exhaust gas sensor signal, and the reference signal is measured during engine operation in accordance with the thermal mode of the exhaust gas sensor.
    [2]
    2. A method according to claim 1, wherein the value of the reference signal is reduced after the start of operation of the correction device, and the value of the reference signal constantly exceeds the value of the limit signal of the lean mixture from the exhaust gas composition sensor.
    [3]
    3. Method according to paragraphs. 2 and 3, that is, in that, the lowering of the magnitude of the reference signal is carried out during the periods when the lean mixture signal is sent from the exhaust gas composition sensor.
    [4]
    4. Method according to paragraphs. 2 and 3, that is, the fact that the decrease in the magnitude of the reference signal is first established in accordance with the engine load and blocks the decrease in the period of formation of control pulses from the correction device.
    [5]
    5. The method according to claim 2, that is, that the magnitude of the reference signal is reduced stepwise after the transition to the formation of control pulses from the sensor of the composition of the exhaust gases. Priority signs: 18.04.75 in PP. 1-4; December 30, 75 under item 5. Sources of information taken into account during the examination 1. U.S. Patent No. 3,782,347, cl. 123-119, publ. 1974.
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    类似技术:
    公开号 | 公开日 | 专利标题
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    CA1093184A|1981-01-06|Frequency modulated single point fuel injection circuit with duty cycle modulation
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    同族专利:
    公开号 | 公开日
    SE7601598L|1976-10-19|
    SU822767A3|1981-04-15|
    BR7602298A|1976-10-12|
    GB1547391A|1979-06-20|
    JPS6041220B2|1985-09-14|
    IT1059163B|1982-05-31|
    FR2307968B1|1982-12-17|
    JPS51129530A|1976-11-11|
    SE411784B|1980-02-04|
    FR2307968A1|1976-11-12|
    US4244340A|1981-01-13|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2517269A|DE2517269C3|1975-04-18|1975-04-18|Method and device for determining the duration of fuel injection pulses|
    DE19752559046|DE2559046C2|1975-12-30|1975-12-30|Method and device for determining the duration of fuel injection pulses|
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