• 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:
    PARAMETRIC TEMPERATURE REGULATION OF HEATED INDUCTION LOAD. The present invention relates to a fuel delivery system (10) for a vehicle that includes a fuel injector (12) that delivers heated fuel flow and controls the temperature of the heated fuel within a desired temperature range. Fuel flowing through the exemplary fuel injector (12) is inductively heated by a valve element sealed to the fuel flow. A trigger controller detects changes in temperature by monitoring changes in parameters that vary in response to the temperature in the heated element material. Changes in material in response to temperature are used to prepare the inlet to the heated element to maintain a desired temperature of the heated element and thus the temperature of the fuel.
    公开号:BR112012018150B1
    申请号:R112012018150-5
    申请日:2011-01-20
    公开日:2021-05-25
    发明作者:Perry Czimmek
    申请人:Continental Automotive Gmbh；
    IPC主号:
    专利说明:

    Background
    [001] The present invention relates to fuel injectors including a heating element to preheat the fuel before combustion. More particularly, this description relates to a method and device for detecting and regulating a temperature of a heating element for a fuel injector.
    [002] Preheating fuel before it is injected into a combustion chamber provides a more complete and efficient combustion that increases fuel efficiency while reducing the production of unwanted emission by-products. Fuel injectors preheat fuel by exposing fuel flow through the fuel injector to a heating element. The fuel temperature is desired to be within a desired range at the fuel injector outlet and inlet to the combustion chamber. Fuel that is not sufficiently heated does not provide a full range of desired benefits, where fuel that is overheated can result in undesirable build-up within the fuel system. For these reasons, the fuel temperature is detected and regulated. Typically, a temperature sensor is provided inside the fuel injector to sense the fuel temperature. Such wired sensors required additional circuitry and control at an additional cost. Consequently, it is desirable to design and develop a method and device for detecting temperature that is more efficient. summary
    [003] An example fuel distribution system described for a vehicle includes a fuel injector that distributes heated fuel flow and controls the temperature of the heated fuel within a desired temperature range.
    [004] The fuel flowing through the exemplary fuel injector is inductively heated by a valve element sealed with the fuel flow. The temperature of the heated valve element is monitored without wires or external sensors. The exemplary driver circuit monitors a material parameter that changes the inductance of materials in response to changes in temperature. The driver circuit detects changes in inductance and changes in energy input in the heated element responsive to the sensed temperature. The temperature of fuel supplied to an engine is therefore kept within a desired temperature range to provide a desired performance.
    [005] The driver circuit detects changes in temperature by monitoring changes in parameters that vary in response to the temperature in the heated element material. Changes in material permeability caused by changes in temperature cause a proportional change in parameters responsive to changes in inductance. In one example, frequency is detected and used to correct the input of energy into the heated element to increase, decrease or maintain a desired temperature of the inductively heated valve element and thereby control the fuel temperature.
    [006] These and other aspects described here can be better understood from the following report and drawings, of which the following is a brief description. Brief Description of Drawings
    [007] Figure 1 is a schematic view of an exemplary fuel system including an inductance heated fuel injector.
    [008] Figure 2 is a graph illustrating a relationship between temperature and permeability.
    [009] Figure 3 is a graph illustrating the relationship between temperature and material properties.
    [0010] Figure 4 is a schematic view of an exemplary fuel injector driver circuit.
    [0011] Figure 5 is a schematic view of an exemplary inductive heating circuit. Description
    [0012] This description is subject to the fulfillment of the constitutional purposes of the US Patent Laws "to promote the advancement of useful science and techniques" (Article 1, Section 8).
    [0013] Referring to Figure 1, an exemplary fuel delivery system 10 for a vehicle includes a fuel injector 12 that measures fuel flow 14 from a fuel tank 16 to an engine 18. The fuel 12 is governed by a controller 20. The controller 20 provides power to a drive coil 22 to control the movement of an armature 24. The movement of the armature 24 controls the flow of fuel 14 through the internal passages of the fuel injector 12.
    [0014] The Exemplary Fuel Injector 12 delivers preheated fuel to aid combustion. A heater coil 30 generates a time varying magnetic field in a heated element 28. In this example, the heated element 28 is a valve element that is sealed into the fuel flow 14 through the fuel injector 12. There are no wires. fixed to the heated element 28. The heating is accomplished by coupling energy through the magnetic field varying with time produced by the heater coil 30. The energy produced by the heater coil 30 is converted to heat within the sealed chamber of the fuel injector 12 by hysteresis and eddy current losses in the heated element material. The heated element 28 transfers heat to the fuel stream 14 to produce a heated fuel stream 28 which is injected into the engine 18. The heated fuel stream 28 improves cold start performance and improves the combustion process to reduce unwanted emissions.
    [0015] The temperature of the heated fuel 28 is controlled within a desired temperature range to provide the desired performance. A temperature that is low will not provide the desired benefits. A temperature that is higher than desired can cause unwanted damage and also result in deposit formation inside the fuel injector.
    [0016] The exemplary fuel delivery system 10 includes a method and circuit that establishes the determination and control of the temperature of the heated element 28 without the use of temperature sensors, or any other sensors installed within the sealed fuel stream.
    [0017] Referring to Figure 2, ferromagnetic materials exhibit a magnetization or magnetic permeability response to temperature that results in some change in induction, B, according to a known relationship: B = uH , where uu is permeability and HH is magnetomotive force.
    [0018] Changes in induction may be non-linear, non-monotonic in the case of a Neel temperature and a Currie temperature demagnetization, with ferromagnetism between these two temperatures. Additionally, the change in induction could be linear, as illustrated in Graph 68, or at least monotonic of strong ferromagnetism at low temperature and reduced ferromagnetism at higher temperature. Graph 68 illustrates a relationship between permeability 70 and temperature 72. With the known relationship for a specific material the temperature of an induced element such as exemplary heated element 28 can be determined.
    [0019] Referring to Figure 3, graph 62 illustrates the relationship between magnetic saturation 64 and temperature 66 for many different materials. The relationships illustrated by graph 62 are used by the exemplary method and circuit to determine the temperature of the heated element. As illustrated, many different magnetic materials can be used as the heated element 28 and provide a known relationship used to determine and control a desired temperature.
    [0020] Consequently, the exemplary fuel system 10 measures induction as a parameter that changes in response to changes in temperature.
    [0021] Induction is a parameter that causes measurable changes in frequency and phase changes. Frequency is related to inductance according to the equation:
    where L is inductance, the measure of induction, or slope of B plotted against H ; and C is capacitance.
    [0022] The exemplary fuel delivery system 10 includes a circuit 32 (figure 4) that uses changes in frequency changes due to changes in inductance, as a control parameter to determine a change in temperature. Alternatively, the phase between current and voltage can also be used as the desired control parameter. The lagging voltage current when the inductance decreases, finally being in perfect phase with no inductance, or reversing with the lagging current voltage in the case of a capacitor. Impedance decreases with less inductance, which affects reactive power and will increase current at a given voltage or decrease the voltage needed to maintain a given current in the inductor. Therefore, frequency, phase and impedance control parameters can be used to determine an induction change as a result of a temperature change. Any of these can be used in the exemplary fuel delivery system 10 to sense and control the temperature of the heated element 28.
    [0023] Referring to Figure 4, the exemplary circuit 32 uses a change in frequency to determine a change in induction and therefore temperature. Exemplary circuit 32 schematically illustrates a portion of electronic drive devices of controller 20. A zero voltage switching power oscillator 36 drives heating coil or inductive load 34 in exemplary circuit 32. However, other oscillator configurations such as , for example, a difficult switching oscillator or other known drive circuit could be replaced by this circuit without being outside the scope of this invention.
    [0024] The frequency or phase is determined from the measurement of a frequency dependent variable of the oscillator 36. In this example, the input voltage is measured from one side of the symmetric oscillator 36 because the input voltage changes directly with the frequency. Frequency or phase is therefore converted into a conveniently measured output such as voltage as indicated schematically at 38.
    [0025] The current in oscillator 36 is monitored by means of a current sensing resistor 40 (R1 in parallel with R2). The measured current from current sensing resistor 40 is differentially amplified to provide a useful value. This value is then multiplied by the scaled frequency voltage on an analog computational motor 42. The result is a frequency corrected current that is represented by a voltage. The voltage is then differentially amplified relative to a target current value in a current error amplifier 56 defined by a voltage integrator 54.
    [0026] This frequency conditioning detects changes and transforms the detected changes in frequency into signals that control the energy sent to load 26 by oscillator 36. In this example, if the frequency increases (indicating an increase in temperature), then the voltage of Current detection is multiplied to a larger value that looks like a larger current to the current error amplifier 56, which causes a smaller error voltage to be output which in turn drives a smaller current.
    [0027] The error voltage is compared to a triangle wave generated from generator 44 used in a PWM (Pulse Width Modulation) circuit part that includes buyer 46 and PWM output driver 48 to create a PWM waveform that represents the determined current. The determined current supplies the energy fed to the power oscillator 36 that is responsive to the detected changes in frequency, and inductance to control heat generation in the heated element 28.
    [0028] Referring to Figure 5, the exemplary circuit 32 uses current direction and error 40, voltage integrator 54, current error amplifier 56, PWM comparator 46, PWM output driver 48, Class Amplifier Bridge D 50, and carrier filter 52, together to form a synthetic energy inductor that provides parametric temperature control that is schematically indicated by block 58. This exemplary circuit diagram illustrates this detection frequency, phase, and/or impedance are used to allow a parametric temperature control by varying the virtual loss of the synthetic energy inducer 58 which controls the replenishment of energy available to the energy oscillator 36.
    [0029] Consequently, the exemplary circuit 32 detects changes in temperature by monitoring changes in parameters that vary in response to the temperature in the magnetic material of the heated element. Changes in material permeability caused by changes in temperature cause a proportional change in parameters responsive to changes in inductance. In the example, the frequency is detected and used to correct energy input to the inductive load to reduce, increase or maintain a desired temperature of the inductively heated element 28, and thereby fuel temperature control.
    [0030] Although a preferred embodiment of this invention has been described, one skilled in the art would recognize that certain modifications would fall within the scope of this invention.
    权利要求:
    Claims (6)
    [0001]
    1. Assembly of heated fuel injector driver circuit, comprising an inductor to provide a magnetic field varying with time in a heating element, with the heating element located in the fuel flow and separated from the inductor; a monitor which detects energy supplied to the inductor and provides a first output value, the energy supplied to the inductor being provided by an oscillator (36) coupled to the inductor; a converter that converts the frequency that changes in response to changes in temperature of the heating element into a second output value; a computational motor (42) that combines the first output value and the second output value to obtain a scaled value; an error amplifier (56) that combines the scaled voltage value with a value target for obtaining an error value; a comparator (46) which compares the error value to a periodic waveform to adjust the energy supplied to the inductor to maintain a desired temperature of the steel element. heating; characterized by the fact that the desired temperature being different from a determined temperature of the heating element, where the determined temperature of the heating element is based on a variable material characteristic with the temperature being a permeability of the heating element; that the monitor comprises a current sensitive resistor that monitors the current supplied to the inductor and where the oscillator (36) comprises a synthetic energy inductor (58), configured to change the output frequency of the oscillator (36) and thus control the energy which is provided to the inductor; the heating element being a fuel injector (12), the fuel injector (12) being coupled to an armature (24), the armature (24) being coupled to a drive coil (22).
    [0002]
    2. Assembly of heated fuel injector driver circuit, according to claim 1, characterized in that the converter converts a phase of the current in the inductor into a voltage that is indicative of the phase.
    [0003]
    3. Heated fuel injector driver circuit assembly according to claim 1, characterized in that the error amplifier (56) combines a monitored current from the current-sensing resistor (40) with the voltage value indicative of frequency to obtain a frequency corrected current value.
    [0004]
    4. Assembly of heated fuel injector driver circuit, according to claim 3, characterized in that the frequency corrected current is differentially amplified with respect to a target current value.
    [0005]
    5. Assembly of heated fuel injector driver circuit, according to claim 4, characterized by the fact that a current corrected by higher frequency is indicative of an increase in temperature that triggers a reduction in energy supplied to the inductor.
    [0006]
    6. Assembly of heated fuel injector driver circuit, according to claim 4, characterized by the fact that a current corrected by lower frequency is indicative of a decrease in temperature that triggers an increase in energy supplied to the inductor.
    类似技术:
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    同族专利:
    公开号 | 公开日
    BR112012018150A2|2016-04-05|
    CN102753811A|2012-10-24|
    DE112011100315T5|2012-11-15|
    DE112011100315B4|2017-10-05|
    WO2011091121A1|2011-07-28|
    US20110180624A1|2011-07-28|
    US8884198B2|2014-11-11|
    CN102753811B|2015-09-09|
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    法律状态:
    2018-05-08| B25A| Requested transfer of rights approved|Owner name: CONTINENTAL AUTOMOTIVE SYSTEMS, INC. (US) |
    2018-05-22| B25A| Requested transfer of rights approved|Owner name: CONTINENTAL AUTOMOTIVE GMBH (DE) |
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-10-06| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2021-03-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-04-06| B09W| Decision of grant: rectification|Free format text: RETIFICACAO DO DESPACHO 9.1 NA RPI2618. |
    2021-05-25| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/01/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/691,810|US8884198B2|2010-01-22|2010-01-22|Parametric temperature regulation of induction heated load|
    US12/691,810|2010-01-22|
    PCT/US2011/021836|WO2011091121A1|2010-01-22|2011-01-20|Parametric temperature regulation of induction heated load|
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