• 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:
    The invention relates to a device for measuring the speed of a roller which moves relative to a camshaft. The roller is fitted at the lower end of a piston which forms part of a high-pressure pump for a fuel injection system of a combustion engine (101 ). The roller is magnetic and a magnetic field sensor is situated inside the piston, close to the roller's journal. When the roller moves towards the camshaft, a periodic signal is generated which can be compared with the camshaft's rotation to make it possible to detect sliding of the roller.
    公开号:SE1150828A1
    申请号:SE1150828
    申请日:2011-09-14
    公开日:2013-03-15
    发明作者:Stefan Jonsson；Anne-Lise Deraedt
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    10152025302using oil. During operation of the engine, the oil is exposed to high temperatures, whichaffects it negatively by making it acidic and corrosive. The axis of the rollerstored on is usually made of brass and when exposed to degenerate oilso it corrodes and its diameter increases. The roller will then not rotate freely aroundthe shaft and slippage between the roller and the camshaft occurs. This causes wear and tearthe cams of the camshaft which can eventually lead to them breaking andthe injection into the engine is adversely affected.
    US2008 / 0116884 describes a magnetic sensor that can be used to measurethe rotational speed of a axle in a vehicle. The sensor is bulky and free-standingfrom those of the vehicle components to be measured. Such a sensor is impossible toutilize where space is limited.
    Thus, there is a need for an improved and less bulky sensor thatcan measure the speed of a roller against a shaft to detect slippage.
    OBJECT OF THE INVENTIONAn object of the invention is to provide a device which solves those problemsfound in the prior art. In particular, the invention relates to a deviceto measure the speed of the roller in a piston pump in an injection system to ainternal combustion engine to be able to detect slippage of the roller.
    SUMMARY OF THE INVENTIONThe invention solves the above-mentioned problems by means of a device according toclaim 1.
    As the roll is made magnetic, the measurement of the roll's speed can be madedirectly on one of the components included in the piston pump. The number of components such asis added to the piston pump to be able to perform the measurement will thus be few. This is beneficialas the available space is very limited. No machining of the roller surfaceis also required, which means that the contact surface between the roller and the cams is unchanged.
    No effect on the lubrication of the roller occurs either. By placing the tendoninside the piston pump adjacent to the recess of the piston pump, a compact installation is obtainedof the sensor, which requires minimal impact on the other components of the piston pump.
    This makes the device according to the invention cheap and easy to install.101520253According to an embodiment of the invention, the sensor is a magnetic field sensor.
    According to another embodiment, the sensor is a Hall sensor. It is a common type ofmagnetic field sensor that is easy to get hold of. Hall sensors are also small enoughto fit in the limited space available in the pump piston. The measured value of aHall sensor is not dependent on the rotation speed of the roller but equally good signalsperceived no matter how fast the roller rotates.
    According to a further embodiment, the roller has been magnetized before mounting. Byapply a given magnetic field to the roller to ensure that the measurement signals are sufficientstrong to be measured and the risk that the roller has a too weak magnetic fieldreduces.
    According to one embodiment, the sensor is connected to a control unit which is arranged to idepending on the kneaded signal, identify sliding motion of the roller. Then the control unitdetected slippage of the roller can, for example, a handler or a service technicianpay attention to it and take measures to prevent further wear and tear.
    According to yet another embodiment, the invention is included in a fuel injection system ofcommon rail type of an internal combustion engine, and the piston pump consists of onehigh pressure pump. Thereby, the invention can be used to detect wear onthe camshaft cam that arises when the roller slides against them and not just rolls.
    The fuel injection system then has a higher operational reliability.
    The invention also relates to an internal combustion engine with a device according tothe invention, as well as a vehicle with such an internal combustion engine.
    LIST OF FIGURESFigure 1 schematically shows a vehicle according to the invention.
    Figure 2 schematically shows the injection system for an engine according to the invention.
    Figure 3 schematically shows a high pressure pump for the fuel injection according tothe invention.
    Figure 4 schematically shows a perspective view of a pump piston according to the invention.10152025304Figure 5 schematically shows a bottom view of a pump piston according to the invention, witha sensor mounted.
    Figure 6 schematically shows a roller according to the invention.Figure 7 shows a measurement signal for the speed of the roller.
    Figure 8 shows a measurement signal for the roller sliding speed occurred.
    DETAILED DESCRIPTION OF THE INVENTIONFigure 1 schematically shows a vehicle 100 with an internal combustion engine 101 according tothe invention. In the figure, the vehicle is shown as a heavy truck, but the inventor canalso be used on other types of vehicles, such as construction vehicles and buses, orstand-alone engines such as in reserve power plants or on ships.
    Figure 2 shows an injection system for injecting the fuel with a very highpressure in an internal combustion engine in the form of a schematically indicated diesel engine 101.
    By injecting the fuel at a very high pressure, the emissions are reducedemissions from the diesel engine 101. The injection system includes a fuel line102 for supplying fuel from a fuel tank 103 to the cylinders of the diesel engine 101. Onefuel pump 104 is provided in the fuel line 102 to transport fuelfrom the fuel tank 103, via a filter 105, to a high pressure pump 106.
    The high pressure pump 106 is adapted to pressurize the fuel so that it with a highpressure is fed into an accumulator tank 107 which consists of a so-called Commom Rail.Injection means 108 are provided in each of the connections betweenthe accumulator tank 107 and the respective cylinders of the internal combustion engine 101. Where andone of the injection means 108 includes a pressure booster 108a to enableinjection of the fuel by means of an injection valve 108b with an even higher pressurepg than the pressure pi prevailing in the accumulator tank 107. An electric control unit 109 isintended to control the operation of the fuel pump 104, the high pressure pump 106 andthe injection means 108. The electric control unit 109 may be acomputer unit provided with appropriate software 109a to provide asuch control. A pressure sensor 107a is mounted in the accumulator tank 107 tosense the prevailing pressure p1 therein and send a signal to the control unit 109 withinformation on sensed pressure values.10152025305During operation of the diesel engine 101, the control unit 109 receives substantially continuouslycontrol signals regarding motor parameters such as, for example, load and speed.
    Using this information, the control unit 109 calculates the amount of fuel thatneed to be supplied to the 101 cylinders of the diesel engine. The control unit 109 also receivesinformation regarding the instantaneous pressure p1 in the accumulator tank 107 fromthe pressure sensor 107a and it can thus estimate the second pressure pg withknowledge of the properties of the pressure amplifier 108a. With i.a. this information canthe control unit 109 controls the injection valves 108b so that they open and closetimes so that a desired amount of fuel with the second high pressure pg canare injected into the respective cylinders of the diesel engine 101.
    Figure 3 shows the high pressure pump 106 in detail. The high pressure pump is equipped with three inrow of cylinders of which Figure 3 shows only one cylinder. For its drive hasthe high pressure pump 106 a camshaft 12 with three cams 14, 14, 14 eachhas two opposite cam cams 16, 16. Each cam 14 is in cam engagement with each onepump piston 18 (only one is shown) which is slidably mounted in a cylinder bore 24 in onepump housing 22. Above each pump piston 18 is defined a pump chamber 26 inthe cylinder bore 24. In the pump chamber 26 there is a spring (not shown) which abuts againstthe pump piston 18 and the upper end of the pump chamber 26. The spring pressesthe pump piston 18 so that it always abuts against the cams 14 of the camshaft 12pump chamber 26 has an inlet 28 and an outlet 32. Adjacent to the inlet 28 andoutlet 32 there are valves 30 resp. 34 for dosing fuel to and from the pump housing22.
    Fuel is supplied to the high pressure pump 106 via a feed pump 104 from the fuel tank103 through an inlet line 102. The fuel is then discharged out of high pressurethe fuel pump 106 to the diesel engine 101 via an outlet line 46. The fuel pump106 camshaft 12 is driven by an output shaft 52 of the internal combustion engine 50 via adrive transmission 60 which typically includes a gear 62 not shown.
    Figure 4 shows a pump piston 18 according to the invention. The pump piston 18 is hollow and wideabout half its height divided but an inner wall 185. In the inner wall 185 there is oneopening 186 through which oil can flow for lubrication. In the pump piston 18mantle surface there is a recess 181 in the upper edge which merges into a ditch 187 in the inner surface ofpump piston 18 jacket surface. Ditch 187 continues along the not wall 185 and10152025306terminates in a hole 182 leading through the inner wall 185. At the bottom ofThe pump piston 18 has recesses 183 in which a roller 19 is mounted on a shaft 191 (see figure3).
    Figure 5 shows the pump piston 18 according to the invention from below. A sensor 184 isarranged in connection with the recesses 183. The sensor 184 thus comes close to the roller 19and can measure the periodic signal which occurs when the magnetic roller 19rotates.
    When the sensor is mounted, the cables are routed through the recess 181, further into the trench 187 andthrough the hole 182 so that the sensor can be mounted adjacent to the recesses 183. It is offgreat importance that the cables to the sensor 184 are mounted in such a way that they are not damagedduring the movement of the pump piston 18 in the pump housing 22. Therefore, it is desirable that the ditch 187made as deep as possible and that the cables are fastened carefully with, for example, glue or tape.
    The roller 19 is shown in more detail in Figure 6. The roller 19 is shaped as a circular cylinder witha through heel 192 into which the shaft 191 is inserted during assembly. The roller 19 ismade of ferromagnetic material and has a certain magnetic field already atmanufacturing. However, this magnetic field differs between different manufacturing batchesand can be very weak. To know for sure which magnetic field the roller 19 has soit is magnetized in a known manner before it is mounted on the pump piston 18 by acertain, specific magnetic field is applied to the roller 19. During the magnetization, an outer layer is appliedmagnetic field on the roller 19 and the material in the roller 19 will then maintain a certainmagnetic field after the outer field is laid off. Since the external magnetic field is known is alsothe magnetic field that the roller 19 will retain after the outer magnetic field has been laidof, known.
    The roller 19 can be made of low-alloy steel with at least 0.98% C and 1.30% -1.60%Cr and can therefore act as a permanent magnet. Also other alloys andmagnetization methods are possible. The key to the invention is that the roller 19 canis provided with a given magnetic field which it maintains during its service life.
    As the roller 19 moves against the cams 14 of the camshaft 12, its magnetic field will givegives rise to a periodic signal, see figure 7. For example, Sensor 184 can sendthe measuring signal to the control unit 109. When the roller moves towards the camshaft without sliding isthe signal continuous, which is shown in Figure 7 as a regular sine curve 701. In Figure10152077 shows the amplitude of the measured magnetic field on the y-axis and the time on the x-axis.
    If, on the other hand, slippage occurs, nails 801 will occur in the signal shown inFigure 8. Figure 8 shows the amplitude of the measured magnetic field on the y-axis and the timeon the x-axis. If slippage is detected, the control unit can be arranged to emit onecorresponding signal to an indicating means, for example that a warning is sent tothe driver by lighting a message on the information cluster. Alternatively canthe control unit includes a memory which stores the information about the slip and which canread as an error code the engine is in the workshop.
    The invention provides a device for detecting wear on the camshaft of ahigh pressure pump in an injection system of an internal combustion engine. Bymagnetize the roller of the piston pump that rests against the camshaft and measure itperiodic signal that thus arises, can slip between the roller and the camshaftdetected. The signal can be processed by a control unit that can pay attention to onedriver or a service technician that a slip has occurred so that the problem can be fixedbefore the cams on the camshaft have broken, or other damage has occurred inthe contact between the pump piston and the camshaft.
    The invention is of course not in any way limited to those described aboveembodiments, but a number of possibilities for modifications thereof should beobvious to a person skilled in the art, without the latter deviating from itthe basic idea of the invention as defined in the appended claims.
    权利要求:
    Claims (1)
    [1]
    A device for a piston pump comprising a pump housing (22), a pump piston (18) which is slidably arranged in a cylinder bore (24) in the pump housing (22), and at its lower end carries a rotatably mounted roller (19) which abuts against a cam (14) on a camshaft (12) to effect reciprocating pump movement of the pump piston (18) during operation, which roller (19) is rotatably mounted on a shaft (19) arranged in the lower part of the pump piston (18). end characterized in that the roller (19) is magnetic and that a sensor (184) is mounted inside the pump piston (18) which sensor senses the magnetic field of the rotating roller. Device according to claim 1, characterized in that the sensor (184) is a Hall-SGFISOF. Device according to one of the preceding claims, characterized in that the roller (19) has been magnetized before mounting. Device according to one of the preceding claims, characterized in that the sensor (184) is connected to a control unit (109) which is arranged to identify the sliding movement of the roller in dependence on the sensed signal. Device according to Claim 4, characterized in that the control unit (109) is arranged to emit a signal if the sliding movement of the roller (19) has been detected. Device according to one of the preceding claims, characterized in that the device is part of a fuel injection system of the common rail type of an internal combustion engine (101) and in that the piston pump consists of a high-pressure pump (106). Internal combustion engine (101) characterized in that it comprises a device according to any one of the preceding claims. Vehicle (100) characterized in that it comprises an internal combustion engine (101) according to claim 7.
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    同族专利:
    公开号 | 公开日
    EP2756315B1|2016-07-27|
    EP2756315A4|2015-04-22|
    WO2013039441A1|2013-03-21|
    SE536012C2|2013-04-02|
    EP2756315A1|2014-07-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3731527A|1970-11-27|1973-05-08|Umc Electronics Co|Fuel injection transducer and timing system|
    JPS54124805U|1978-02-21|1979-08-31|
    US6213075B1|1999-06-10|2001-04-10|Caterpillar Inc.|Roller follower assembly for an internal combustion engine|
    DE10326880A1|2003-06-14|2004-12-30|Daimlerchrysler Ag|Radial piston pump for fuel high pressure generation in fuel injection systems of internal combustion engines|
    WO2005088259A1|2004-03-11|2005-09-22|Robert Bosch Gmbh|Magnet sensor arrangement|
    DE102006041673A1|2006-02-20|2007-08-23|Robert Bosch Gmbh|High pressure pump especially for fuel injection in IC engine has the cam follower supported axially by hardened low wear surfaces|
    DE102009028392B4|2009-08-10|2018-05-24|Robert Bosch Gmbh|high pressure pump|IT201600093157A1|2016-09-15|2018-03-15|Bosch Gmbh Robert|PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150828A|SE536012C2|2011-09-14|2011-09-14|Device for measuring the movement of the pump piston roller as it moves against the camshaft in an injection system|SE1150828A| SE536012C2|2011-09-14|2011-09-14|Device for measuring the movement of the pump piston roller as it moves against the camshaft in an injection system|
    PCT/SE2012/050935| WO2013039441A1|2011-09-14|2012-09-04|Device for measuring movement of a rotating body|
    EP12831432.5A| EP2756315B1|2011-09-14|2012-09-04|Device for measuring movement of a rotating body|
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