EP2569519B1 - Method of controlling an engine having a variable output oil pump - Google Patents

Method of controlling an engine having a variable output oil pump Download PDF

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Publication number
EP2569519B1
EP2569519B1 EP11723869.1A EP11723869A EP2569519B1 EP 2569519 B1 EP2569519 B1 EP 2569519B1 EP 11723869 A EP11723869 A EP 11723869A EP 2569519 B1 EP2569519 B1 EP 2569519B1
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EP
European Patent Office
Prior art keywords
oil pressure
oil
internal combustion
combustion engine
camshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11723869.1A
Other languages
German (de)
French (fr)
Other versions
EP2569519A1 (en
Inventor
Dirk Windrich
Axel Wachtendorf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE201010019933 priority Critical patent/DE102010019933A1/en
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to PCT/EP2011/002164 priority patent/WO2011141130A1/en
Publication of EP2569519A1 publication Critical patent/EP2569519A1/en
Application granted granted Critical
Publication of EP2569519B1 publication Critical patent/EP2569519B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/02Pressure lubrication using lubricating pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/16Controlling lubricant pressure or quantity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/18Indicating or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445Details relating to the hydraulic means for changing the angular relationship

Description

  • The invention relates to a method for operating an internal combustion engine, wherein in an oil circuit of the internal combustion engine, in particular for pressure circulation lubrication, a first oil pressure stage with a first minimum and maximum oil pressure level and at least one second oil pressure stage with a second minimum and maximum oil pressure level is generated by an oil pump, wherein the first minimum oil pressure level is less than or equal to the second minimum oil pressure level and the first maximum oil pressure level is less than the second maximum oil pressure level, wherein a camshaft of the internal combustion engine is hydraulically adjusted by an actuator by means of an oil pressure from the oil circuit of the internal combustion engine, according to the preamble of claim 1
  • Internal combustion engines usually have a mechanically driven oil pump. In some applications, it is possible by a corresponding adjusting device or a switching mechanism to approach two or more pressure levels with this oil pump with different oil pressure level or different value ranges in which the oil pressure moves depending on the operating state of the internal combustion engine. The oil pump has a mechanically acting device for regulating the oil pressure. The internal combustion engine does not require the same, high oil pressure in each operating map point. Usually, the oil pressure can be lowered to low speeds and loads. Only when a corresponding, predetermined load and speed threshold is exceeded is switched to the higher second pressure level. The oil pressure is thus adapted to the current needs of the internal combustion engine. The power consumption of such a two-stage or multi-stage oil pump compared to a single-stage oil pump is lower. A problem of two-step, as from the JP 2004 116 430 known, oil pump is the diagnosis of the actuating mechanism. For this purpose, it is known to use a separate oil pressure sensor for each pressure stage. The two or multi-stage oil pump therefore requires at least one additional pressure sensor. This additional sensor requires corresponding costs and requires space.
  • The monitoring of an oil pressure by means of a pressure sensor is for example from the DE 10 2005 050 775 A1 known. In an engine oil circuit for an internal combustion engine, a pressure sensor is spatially integrated into a hydraulic component. As a result, an otherwise conventional pressure switch for monitoring an existing minimum pressure can be omitted, since the output signal of the integrated pressure sensor can be used for pressure monitoring.
  • From the DE 198 25 288 A1 an internal combustion engine is known in which a camshaft adjuster (actuator for adjusting the camshaft) comprises a hydraulic vane actuator which rotates the camshaft relative to the crankshaft and this is acted upon by an electrically actuated hydraulic valve with engine oil from the engine oil circuit.
  • From the US 5 529 023 It is known to monitor the functionality of a camshaft adjuster based on a displacement angle of the camshaft adjustment. If a predetermined adjustment angle is not reached, then a defect in the camshaft adjuster is assumed. However, this monitoring is suspended when an oil pressure in a camshaft adjuster supplying oil circuit is lower than a predetermined value. In this case, the camshaft adjustment is exposed to itself.
  • The invention is based on the object, a method of o.g. Simplify the type of component complexity while improving the monitoring of the operability of the switching mechanism of the oil pump.
  • This object is achieved by a method of o.g. Art solved with the features characterized in claim 1. Advantageous embodiments of the invention are described in the further claims.
  • For this purpose, it is provided according to the invention in a method of the aforementioned type that a first adjustment speed of the camshaft is determined by the actuator, while the first oil pressure stage is generated by the oil pump, wherein for at least one second oil pressure stage, a second adjustment speed of the camshaft is determined by the actuator while the second oil pressure stage is generated by the oil pump, wherein at least one difference between the first and at least a second adjustment speed is determined, wherein a switching mechanism of the oil pump for switching between the oil pressure levels is judged to be okay when an amount of the difference is equal to or greater as a predetermined differential value, and the switching mechanism of the oil pump for switching between the oil pressure levels is classified as defective when an amount of the difference is smaller than a predetermined difference value.
  • This has the advantage that a functionality of the switching mechanism of the oil pump is monitored without additional hardware exclusively with existing sensors, the monitoring is independent of tolerances on oil viscosity, the oil pump, the actuator or a valve of the actuator in the oil circuit.
  • One independent of the operating condition of the internal combustion engine monitoring the functioning of the switching mechanism of the oil pump without compensation, for example, speed or load-related fluctuations of the oil pressure is achieved in that the first and at least a second adjustment speed are determined in an identical operating condition of the internal combustion engine.
  • Additional monitoring of the operability of the oil pump itself is achieved in that in an operating state of the internal combustion engine, during which the first oil pressure stage is generated by the oil pump, the oil pressure is monitored by a pressure sensor.
  • An active diagnosis of the switching mechanism of the oil pump for the various oil pressure levels achieved by the fact that after determining the first adjustment speed, the oil pump regardless of the current operating state of the internal combustion engine switched to at least a second oil pressure stage, the camshaft adjusted and thereby the second adjustment speed is determined.
  • An examination of the switching mechanism of the oil pump for the different oil pressure levels at defined states of the internal combustion engine is achieved by the fact that the first and second Verstellgeschwindigkeit be determined at least one predetermined operating point of the internal combustion engine, regardless of the operating point, the respective oil pressure level is switched and the camshaft is adjusted ,
  • To comply with pollutant limits for the internal combustion engine, the at least one predetermined operating point of the internal combustion engine is selected such that there is a minimal increase of pollutant emissions in the exhaust gas.
  • The invention will be explained in more detail below with reference to the drawing. This shows in
  • Fig. 1
    FIG. 2 shows a schematic block diagram of an internal combustion engine for carrying out the method according to the invention, FIG.
    Fig. 2
    a flow diagram of a preferred embodiment of the method according to the invention and
    Fig. 3
    an operating map for an internal combustion engine.
  • The invention relates to an internal combustion engine, as shown schematically in FIG Fig. 1 shown, with an engine block 10, an oil pump 12 and a motor oil circuit 14, which is in particular designed for circulation pressure lubrication. In the engine oil circuit 14 for circulation pressure lubrication controllable hydraulic components are connected, the necessary for their operation operating fluid is provided by the engine oil of the engine oil circuit 14. The regulation of the fluid flow, that is, the engine oil flow flowing through the hydraulic component, is effected by electrical control signals of an electronic control unit 22. Such a controllable hydraulic component is a hydraulic camshaft adjuster 18 for adjusting a camshaft 16 with a hydraulic valve, which is designed, for example, as a solenoid valve. In other words, the actuator for the camshaft adjustment is integrated into the engine oil circuit.
  • The pressure prevailing in the engine oil circuit oil pressure is provided by the mechanically driven oil pump 12 in the engine oil circuit 14. The oil pump 12 has a switching mechanism 20 to switch between different oil pressure levels. Here, a first oil pressure stage is provided, in which the oil pressure in response to an operating condition of the internal combustion engine in a first range between a first minimum oil pressure value (oil pressure level) and a first maximum oil pressure value (oil pressure level) fluctuates. Furthermore, at least one second oil pressure stage is provided in which the oil pressure fluctuates in a second range between a second minimum oil pressure value (oil pressure level) and a second maximum oil pressure value (oil pressure level) depending on an operating condition of the internal combustion engine. Here, the first minimum oil pressure value is less than or equal to the second minimum oil pressure value, and the first maximum oil pressure value is smaller than the second maximum oil pressure value. For the first oil pressure stage, an oil pressure sensor 24 is provided for monitoring the oil pressure.
  • Depending on the level of oil pressure, the camshaft adjustment varies at different speeds. The resulting angular velocity correlates with the oil pressure. The angular velocity can be measured by passing through a sufficient adjustment range with maximum activation of the solenoid valve of the camshaft adjuster 18. The angular velocity is additionally dependent on the engine speed and oil temperature and should be corrected via this. It is typically in a range that is well and safely measurable with devices available in engine controls.
  • According to the invention, it is provided to use the angular velocity of the camshaft adjustment for monitoring the switching mechanism 20 of the oil pump 12 for different oil pressure levels. Due to the tolerance chain regarding in particular oil viscosity, pump characteristics, camshaft adjuster 18 and solenoid valve, not only the angular velocity in the second oil pressure stage that can not be monitored by the remaining oil pressure sensor is determined. Rather, it is provided according to the invention even at the first Ödruckstufe, i. So in both pressure stages, to measure or determine the angular velocity of the camshaft adjustment. If the difference in angular velocities is sufficiently pronounced, i. greater than or equal to a predetermined threshold, it can be assumed that the switching mechanism 20 of the oil pump 12 is working properly. The first, low oil pressure level is monitored by the pressure sensor. The second pressure stage is monitored by evaluating the above-described comparison of the measured adjustment speed of the camshaft adjusting device 18 at different oil pressure levels. If the speed of the camshaft adjustment is identical in both oil pressure stages, it can be assumed that the switching mechanism 20 of the oil pump 12 is not working properly. The oil pump 12 can only set a pressure or an oil pressure stage in this case.
  • In a preferred embodiment of the method according to the invention, first the first and then the second oil pressure stage are driven at a constant operating point. The term "constant operating point" here refers to an operating state of the internal combustion engine in which not necessarily one of the second, higher oil pressure stages and also not necessarily a camshaft adjustment is required. In other words, the oil pressure stage and the camshaft adjustment are adjusted or changed independently of the current operating state of the internal combustion engine. In both pressure stages, the adjustment speed of the camshaft adjustment is measured or determined and evaluated or determines the difference. The dependencies on the oil temperature and the load-speed point are excluded in this way. The impact on the Emissions due to the non-optimal camshaft position during the measurement are taken into account by a suitable choice of the constant operating point.
  • The cost or installation space disadvantage of a second oil pressure sensor for the second oil pressure stage can be saved because no additional oil pressure sensor is required for monitoring whether the second pressure level is reached. A cost neutrality is achieved because the diagnosis of the second oil pressure stage is based on already existing in the internal combustion engine actuators and sensors.
  • In Fig. 2 By way of example, a flow chart of a preferred embodiment of the method according to the invention is shown. In a first step 100, input conditions for the method are checked. For example, it is checked whether a load, a rotational speed and a temperature of a coolant and the engine oil are in a predetermined range. If this is not the case even for one of the aforementioned parameters, the diagnosis of the camshaft is not carried out and jumped back to step 100 via a first branch 102 "no".
  • If all tested parameters are within a predetermined range, then a second branch 104 "yes" is used to jump to a second step 106 "oil pump in pressure stage 1 => requirement camshaft desired jump". In this second step 106, the oil pump is operated in such a way that it provides a first pressure stage and the camshaft is adjusted. In a third step 108 "Camshaft measurement", an adjustment speed 1 of the camshaft during the adjustment is determined as angular velocity w [° / ms] for the first pressure stage. In a fourth step 110 "oil pump in pressure stage 2 => request camshaft desired jump", the oil pump is operated such that it provides a second pressure level in the oil circulation system of the internal combustion engine, wherein the resulting in the oil circuit system of the engine pressure different from the corresponding pressure at the first pressure level is, and it is again adjusted the camshaft. In a fifth step 112 "camshaft measurement", an adjustment speed 2 of the camshaft during the adjustment is determined as angular velocity ω [° / ms] for the second pressure stage. In a sixth step 114 "Verstellgeschwindigkeit 2> Verstellgeschwindigkeit 1" is checked whether the adjustment speed 2 for the second pressure level is greater than the adjustment speed 1 for the first pressure stage. If the oil pump or the actuator for the pressure stages operates correctly and generates a higher pressure in the oil circuit system of the internal combustion engine in the second pressure stage than in the first pressure stage, the adjustment speed must be 2 Thus, conversely, this is an indication of a correctly working oil pump or switching between the pressure levels. Therefore, from the sixth step 114 via a third branch 118, "yes" is entered to a seventh step 116 "Test completed, oil pump pressure stage actuator OK", if in step 114 the result of the test is "Verstellgeschwindigkeit 2> Verstellgeschwindigkeit 1?" yes is. If this is not the case, however, then a fourth branch 120 "no" to an eighth step 122 "test completed, actuator for pressure stages of the oil pump is not in order" jumped.
  • Fig. 3 FIG. 2 illustrates an operating map of an internal combustion engine, wherein a rotational speed n of the internal combustion engine is plotted on a horizontal axis 200 and an engine torque M or a load is plotted on a vertical axis 202. In this so-called "load speed map" results in an operating range for the internal combustion engine, which is limited by a first graph 204, the horizontal axis 200 and the vertical axis 202. Within this operating range of the internal combustion engine there is a first map area 206, in which the first and second pressure stage of the oil pump can be driven. Within this first map area 206, there is a second map area 208, in which the diagnostic method described above can be performed, for which the following conditions must be fulfilled: both pressure levels must be permissible, an influence on the exhaust gas by the position jump of the camshaft must be low and An influence on the driving behavior of a vehicle equipped with the internal combustion engine by the position jump of the camshaft must be low. All this is met in the second map area 208. The remainder of the operating range outside of the first map area 206 is a third map area 210 in which only the second pressure stage can be driven. For this reason, this third map area 210 is not suitable for the diagnostic method described above.
  • LIST OF REFERENCE NUMBERS
  • 10
    block
    12
    oil pump
    14
    Oil circuit
    16
    camshaft
    18
    actuator
    20
    Switching mechanism of the oil pump for switching between the oil pressure stages
    22
    control electronics
    24
    Oil pressure sensor
    100
    First step: Check the entry conditions for the procedure
    102
    Branch: "no"
    104
    Branch: "yes"
    106
    second step: oil pump in pressure stage 1 => request camshaft setpoint jump
    108
    third step: measuring camshaft
    110
    4th step: oil pump in pressure stage 2 => request camshaft setpoint jump
    112
    fifth step: measuring camshaft
    114
    sixth step "Adjustment speed 2> Adjustment speed 1
    116
    Seventh step: Test completed, actuator for pressure stages of the oil pump in order
    118
    third branch "yes"
    120
    fourth second: "no"
    122
    Eighth step: Test completed, actuator for pressure stages of the oil pump out of order
    200
    horizontal axis: speed n
    202
    vertical axis: motor torque M
    204
    first graph
    206
    first map area
    208
    second map area
    210
    third map area

Claims (6)

  1. Method for operating an internal combustion engine, wherein, in an oil circuit of the internal combustion engine, in particular for the purposes of pressure circulation lubrication, a first oil pressure stage with a first minimum and maximum oil pressure level and at least one second oil pressure stage with a second minimum and maximum oil pressure level are selectively generated by an oil pump, wherein the first minimum oil pressure level is lower than or equal to the second minimum oil pressure level, and the first maximum oil pressure level is lower than the second maximum oil pressure level, wherein a camshaft of the internal combustion engine is hydraulically adjusted by an actuator by way of an oil pressure from the oil circuit of the internal combustion engine, characterized in that a first speed of adjustment of the camshaft by the actuator is determined while the first oil pressure stage is being generated by the oil pump, wherein, for at least one second oil pressure stage, a second speed of adjustment of the camshaft by the actuator is determined while the second oil pressure stage is being generated by the oil pump, wherein at least one difference between the first and at least one second speed of adjustment is determined, wherein a switching mechanism of the oil pump for switching between the oil pressure stages is regarded as being correctly operational if a magnitude of the difference is equal to or greater than a predetermined difference value, and the switching mechanism of the oil pump for switching between the oil pressure stages is regarded as being defective if a magnitude of the difference is smaller than a predetermined difference value.
  2. Method according to Claim 1, characterized in that the first and at least one second speed of adjustment are determined in an identical operating state of the internal combustion engine.
  3. Method according to at least one of the preceding claims, characterized in that, in an operating state of the internal combustion engine during which the first oil pressure stage is being generated by the oil pump, the oil pressure is monitored by a pressure sensor.
  4. Method according to at least one of the preceding claims, characterized in that, after a determination of the first speed of adjustment, the oil pump is, regardless of the present operating state of the internal combustion engine, switched to at least one second oil pressure stage, the camshaft is adjusted, and in the process the second speed of adjustment is determined.
  5. Method according to at least one of the preceding claims, characterized in that the first and the second speed of adjustment are determined at at least one predetermined operating point of the internal combustion engine, wherein, regardless of the operating point, the respective oil pressure stage is switched and the camshaft is adjusted.
  6. Method according to Claim 5, characterized in that the at least one predetermined operating point of the internal combustion engine is selected so as to result in a minimal increase in pollutant emissions in the exhaust gas.
EP11723869.1A 2010-05-08 2011-05-02 Method of controlling an engine having a variable output oil pump Active EP2569519B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE201010019933 DE102010019933A1 (en) 2010-05-08 2010-05-08 Method for operating an internal combustion engine with a multistage oil pump
PCT/EP2011/002164 WO2011141130A1 (en) 2010-05-08 2011-05-02 Method for operating an internal combustion engine having a multi-stage oil pump

Publications (2)

Publication Number Publication Date
EP2569519A1 EP2569519A1 (en) 2013-03-20
EP2569519B1 true EP2569519B1 (en) 2016-02-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11723869.1A Active EP2569519B1 (en) 2010-05-08 2011-05-02 Method of controlling an engine having a variable output oil pump

Country Status (4)

Country Link
EP (1) EP2569519B1 (en)
CN (1) CN102869858B (en)
DE (1) DE102010019933A1 (en)
WO (1) WO2011141130A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102019121153B3 (en) * 2019-08-06 2020-10-29 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Method for controlling a camshaft adjustment

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Publication number Priority date Publication date Assignee Title
GB2551509B (en) 2016-06-20 2020-08-26 Ford Global Tech Llc An engine assembly comprising a camshaft driven oil pump
CN107989786B (en) * 2017-11-25 2019-07-05 蚌埠市鑫源机电设备有限公司 A kind of pump operation regulator control system of subregion detection

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Also Published As

Publication number Publication date
CN102869858B (en) 2014-12-10
DE102010019933A1 (en) 2011-11-10
WO2011141130A1 (en) 2011-11-17
EP2569519A1 (en) 2013-03-20
CN102869858A (en) 2013-01-09

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