EP2157293A1 - Vehicle control device - Google Patents

Vehicle control device Download PDF

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Publication number
EP2157293A1
EP2157293A1 EP08740096A EP08740096A EP2157293A1 EP 2157293 A1 EP2157293 A1 EP 2157293A1 EP 08740096 A EP08740096 A EP 08740096A EP 08740096 A EP08740096 A EP 08740096A EP 2157293 A1 EP2157293 A1 EP 2157293A1
Authority
EP
European Patent Office
Prior art keywords
oil pressure
engine
anomaly
idle
oil
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.)
Withdrawn
Application number
EP08740096A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kouki Moriya
Takuya Yoshiyama
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP2157293A1 publication Critical patent/EP2157293A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
    • F01M5/025—Conditioning lubricant for aiding engine starting, e.g. heating by prelubricating, e.g. using an accumulator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto

Definitions

  • the present invention relates to a vehicle control apparatus of a vehicle equipped with an engine in which a lubricating oil and a working oil are circulated by an oil pump driven by a crankshaft, and in particular to an improvement in an oil pressure monitoring function.
  • Some conventional vehicles are equipped with an idle-stop function (or also called an eco-run function) in order to suppress the amount of fuel consumed and reduce the amount of exhaust gas emitted (see, for example, Patent Literature 1).
  • Such an idle-stop function is provided, for example, in an ordinary vehicle equipped with a gasoline engine, a diesel engine or the like, to automatically shut down an engine when the vehicle temporarily stops for, for example, a traffic light or another reason (when a prescribed automatic shutdown condition is satisfied) and restart the engine when the vehicle then starts off (when a prescribed restart condition is satisfied).
  • a proposal has also been conceived to incorporate an oil pressure monitoring function that performs a notification operation for an oil pressure anomaly upon detection of an anomaly such as engine oil pressure dropping to or below a prescribed level (see, for example, Patent Literature 1 and Patent Literature 2).
  • Patent Literature 1 a configuration is adopted in which the presence or absence of an anomaly in the working oil is monitored only during operation of the engine. As such, when an oil pressure anomaly is found, an oil pressure warning lamp is turned on with a sound only during operation of the engine, and the alarm operation is stopped when the engine is automatically shut down in that state.
  • Patent Literature 1 For example, when a warning operation is performed upon detection of an oil pressure anomaly during operation of the engine, if the engine is automatically shut down, the notification operation for the oil pressure anomaly is stopped. Consequently, not only can the driver not be sure of the occurrence of an oil pressure anomaly, but also it may cause the driver to suspect that a malfunction might have occurred in the oil pressure anomaly monitoring system. Thus, the conventional example of Patent Literature 1 might confuse the driver, so it can be said that it cannot accurately transmit information regarding an oil pressure anomaly.
  • Patent Literature 1 employs a configuration that turns on an oil pressure warning lamp with a sound used when the driver forgets to engage the parking brake instead of stopping an alarm operation for an oil pressure anomaly during automatic shutdown of the engine, but such a configuration might further confuse the driver.
  • the present invention is a vehicle control apparatus of a vehicle equipped with an engine in which a lubricating oil and a working oil are circulated by an oil pump driven by a crankshaft, the apparatus including: an idle-stop function that automatically shuts down the engine when a prescribed automatic shutdown condition is satisfied, and restarts the automatically shut-down engine when a prescribed restart condition is satisfied; and an oil pressure monitoring function that performs a notification operation for an oil pressure anomaly upon detection of an oil pressure anomaly during operation of the engine, the oil pressure monitoring function maintaining the notification operation even when the engine is automatically shut down by the idle-stop function during execution of the notification operation.
  • a notification operation for an oil pressure anomaly is performed upon detection of an anomaly in the oil pressure of an engine during operation of the engine, but even if the engine is automatically shut down by an idle-stop function during execution of the notification operation, the notification operation is deliberately maintained.
  • the oil pressure monitoring function includes: an oil pressure determination means for determining the presence or absence of an anomaly such as an oil pressure dropping to or below a prescribed level based on an output from an oil pressure detecting element during operation of the engine; a notification executing means for performing the notification operation for an oil pressure anomaly and generating a notification operation execution history when the oil pressure determination means has determined that an oil pressure anomaly is present; and a notification managing means for, when the engine is automatically shut down by the idle-stop function, checking for the presence or absence of the execution history and maintaining the state of the notification operation from before the automatic shutdown.
  • an oil pressure determination means for determining the presence or absence of an anomaly such as an oil pressure dropping to or below a prescribed level based on an output from an oil pressure detecting element during operation of the engine
  • a notification executing means for performing the notification operation for an oil pressure anomaly and generating a notification operation execution history when the oil pressure determination means has determined that an oil pressure anomaly is present
  • a notification managing means for, when the engine is automatically shut down by the idle
  • the oil pressure monitoring function includes a means for determining the presence or absence of an anomaly such as an oil pressure dropping to or below a prescribed level based on the output from an oil pressure detecting element during operation of the engine; a means for, when the aforementioned means has determined that an oil pressure anomaly is present, performing a notification operation for the oil pressure anomaly and generating a notification operation execution history; and a means for, when the engine is automatically shut down by the idle-stop function, maintaining the state of the notification operation from before the automatic shutdown.
  • an anomaly such as an oil pressure dropping to or below a prescribed level based on the output from an oil pressure detecting element during operation of the engine
  • an oil pressure determining means As a specific means for implementing the oil pressure monitoring function, an oil pressure determining means, a notification executing means and a notification managing means are specified, whereby the configuration of the vehicle control apparatus becomes clear.
  • the vehicle control apparatus of the present invention it becomes possible to accurately transmit information regarding an oil pressure anomaly to the driver even when the engine is automatically shut down by the idle-stop function during execution of a notification operation upon the occurrence of an oil pressure anomaly during operation of the engine, whereby unnecessary anxiety for the driver is avoided.
  • Figs. 1 to 6 show an embodiment of the present invention. Before describing an embodiment to which a feature of the present invention is applied, an overview of a configuration of the drivetrain of a vehicle to which the present invention is applied will be described with reference to Fig. 1 .
  • the drivetrain includes an engine 1 as a motive power source, an automatic transmission 2 and a vehicle control apparatus 3.
  • the engine 1 is, for example, a gasoline engine in which an air-fuel mixture of intake air adjusted by an electronic control throttle 5 and fuel injected from an injector 6 mixed at an appropriate ratio is supplied to a combustion chamber, and is burnt with a spark plug ignited by an igniter 7, thereby generating rotational power.
  • the engine 1 may be a diesel engine.
  • the engine 1 is cranked by rotationally driving a flywheel (not shown) that is connected to a crankshaft 1a by means of a starter motor 8 as a starting apparatus.
  • An oil pump 9 that circulates a lubricating oil and a working oil inside the engine 1 is configured to be driven by the crankshaft 1a.
  • the electronic control throttle 5 is configured to adjust the opening degree of a throttle valve that is disposed in an intake manifold as appropriate by driving a throttle motor based on the amount of accelerator pedal depression (accelerator opening degree) of an accelerator pedal 11 and a requisite condition for control.
  • the automatic transmission 2 changes the speed of rotational power generated by the engine 1 as appropriate and outputs the power to a driving system, and has a generally known configuration that includes a torque converter, a transmission mechanism unit, an oil pressure control apparatus, and so on.
  • the transmission mechanism unit may be any one of a planetary gear mechanism, a gear train mechanism that has a plurality of gears, a continuously variable transmission mechanism such as a CVT, and the like.
  • the vehicle control apparatus 3 includes a generally known engine ECU (Electronic Control Unit) 31, a transmission ECU 32, an idle-stop ECU 33, and the like, and is configured to collectively control various operations, such as various control operations for operating the engine 1 and transmission control operations of the automatic transmission 2, based on the information input from various detection elements.
  • ECU Electronic Control Unit
  • transmission ECU Transmission ECU
  • idle-stop ECU 33 idle-stop ECU
  • the ECUs 31 to 33 are each configured to include a CPU, a ROM, a RAM, a backup RAM, and the like, and are capable of transmitting and receiving stored data to and from each other as necessary.
  • a CAN Controller Area Network
  • the ROM stores various control programs, maps that are referred to when executing such control programs, and the like.
  • the CPU executes computational processes based on various control programs and maps stored in the ROM.
  • the RAM is a memory that temporarily stores the results of computation by the CPU, information input from various detection means, and the like.
  • the backup RAM is a non-volatile memory that stores various data to be stored when the engine 1 is shut down or the like.
  • the detection elements for inputting information into the vehicle control apparatus 3 include, at least, as shown in Fig. 2 , an engine revolution sensor 71, a vehicle speed sensor 72, an accelerator opening degree sensor 73, a shift position sensor 74, a foot brake switch 75, an oil pressure switch 76 as an oil pressure detecting element 76, and so on.
  • the engine revolution sensor 71 detects the number of revolutions of the engine 1
  • the vehicle speed sensor 72 detects the speed of the vehicle
  • the accelerator opening degree sensor 73 detects the opening degree of the accelerator pedal 11.
  • the shift position sensor 74 detects the shift position selected by a shift lever 12 of the automatic transmission 2.
  • the foot brake switch 75 detects whether or not a foot brake pedal 13 has been operated by the driver of the vehicle.
  • the oil pressure switch 76 is turned on and off based on whether or not the oil pressure discharged from the oil pump 9 is not greater than a prescribed threshold value.
  • Such a vehicle control apparatus 3 is configured to execute at least an idle-stop function, and also to execute an oil pressure monitoring function.
  • the idle-stop function is basically the same as that of a known method, specifically, a function that automatically shuts down the engine 1 when a prescribed automatic shutdown condition is satisfied, and restarts the engine 1 that was automatically shut down when a prescribed restart condition is satisfied, which is primarily controlled by the idle-stop ECU 33.
  • the automatic shutdown condition of the engine 1 includes, for example, vehicle speed, accelerator opening degree, the state of a foot brake, and the like, and if it is determined, based on the outputs from, for example, the vehicle speed sensor 72, the accelerator opening degree sensor 73 and the foot brake switch 75, that the vehicle speed is zero, the accelerator is off, and the foot brake is on, the idle-stop ECU 33 determines that an automatic shutdown condition has been satisfied, and transmits a shutdown instruction to the engine ECU 31 to forcibly shut down the fuel injection system, ignition system and the like of the engine 1 and to thereby shut down the operation of the engine 1.
  • the restart condition of the engine 1 includes the shift position, the state of a foot brake, or the like, and if it is determined, based on the outputs from the shift position sensor 74 and the foot brake switch 75, that the shift position is in a drive (D) range or the foot brake switch 75 is off, the idle-stop ECU 33 determines that a restart condition has been satisfied, and transmits a restart instruction to the engine ECU 31 to drive the starter motor 8 and to thereby rotate (crank) the crankshaft 1a of the engine 1 and drive the fuel injection system, ignition system and the like of the engine 1 in response to the timing of the cranking so as to restart the operation of the engine 1.
  • the oil pressure monitoring function is a function that causes the oil pressure warning lamp 15 as an oil pressure anomaly notification element to perform a notification operation if an oil pressure anomaly is detected during operation of the engine 1, which is primarily controlled by, for example, the engine ECU 31.
  • the oil pressure monitoring function can be incorporated as, for example, a diagnostic function by diagnostics, and controlled by a dedicated ECU.
  • the oil pressure warning lamp 15 is disposed, for example, on a meter panel or the like installed inside the vehicle compartment.
  • the oil pressure warning lamp 15 it is also possible to, for example, use an alarm buzzer, or display a message, a mark or the like that indicates an oil pressure anomaly on a message display unit provided in the meter panel or the like installed inside the vehicle compartment.
  • the oil pressure monitoring function is devised to perform a process of substantially detecting an oil pressure anomaly only during operation of the engine 1 and, when the engine 1 is automatically shut down, for example, maintain a notification operation for an oil pressure anomaly that was performed before the automatic shutdown of the engine 1.
  • Step S1 it is determined whether or not the engine 1 is currently in operation. Such a determination can be made based on, for example, the state of an ignition switch (not shown) and the output from the engine revolution sensor 71.
  • the expression "during operation of the engine” refers to an idling state and a running state.
  • Step S1 if the engine 1 is in operation, a positive determination is made in Step S1, and the procedure flows through a flow spanning from Step S2 to Step S6, whereas if the engine 1 is determined not to be in operation, a negative determination is made in Step S1, and the procedure flows through a flow including Steps S11 and 12.
  • Step S2 it is determined whether or not an anomaly is present in the oil pressure. Such a determination can be made by checking whether the oil pressure switch 76 is on or off. The oil pressure switch 76 is off when the oil pressure discharged from the oil pump 9 is within a prescribed appropriate range and is on when the oil pressure is outside the appropriate range.
  • Step S4 the oil pressure warning lamp 15 is turned off, and the procedure exits the flowchart.
  • Step S2 If, on the other hand, the oil pressure switch 76 is on, it indicates that the oil pressure is abnormal, so a positive determination is made in Step S2, and in Step S5, the oil pressure anomaly flag is set to "1". Subsequently, in Step S6, the oil pressure warning lamp 15 is turned on, and the procedure exits the flowchart.
  • Step S11 it is determined whether or not the shutdown of the engine 1 is an automatic shutdown period of the engine 1 caused by the idle-stop function. Such a determination can be made by referring to, for example, the state of an automatic shutdown flag of the idle-stop ECU 33.
  • the automatic shutdown flag is set to "1" when the engine 1 is automatically shut down by the idle-stop function and is set to "0" when the engine 1 is restarted.
  • Step S11 if the shutdown of the engine 1 is not an automatic shutdown caused by the idle-stop function, a negative determination is made in Step S11, and the procedure exits the flowchart. However, if the shutdown of the engine 1 is carried out by the idle-stop function, a positive determination is made in Step S11, and the procedure goes to the next step, Step S12.
  • Step S12 it is determined whether or not the oil pressure anomaly flag is "1". That is, in this step, whether or not a notification operation for an oil pressure anomaly was performed before the automatic shutdown of the engine 1 is checked.
  • Step S12 if the oil pressure anomaly flag is "0", or in other words, no notification operation for an oil pressure anomaly was performed before the automatic shutdown of the engine 1, a negative determination is made in Step S12, and the procedure goes to Step S4, where the state of the oil pressure warning lamp 15 being turned off is maintained, and the procedure exits the flowchart.
  • Step S12 If, however, the oil pressure anomaly flag is "1", or in other words, a notification operation for an oil pressure anomaly was performed before the automatic shutdown of the engine 1, a positive determination is made in Step S12, and the procedure goes to Step S6, where the state of the oil pressure warning lamp 15 being turned on is maintained, and the procedure exits the flowchart.
  • Fig. 4 is a time chart used to illustrate an operation performed when the oil pressure is normal in the present embodiment.
  • Fig. 5 is a time chart used to illustrate an operation performed when the oil pressure is abnormal in the present embodiment.
  • Fig. 6 is a time chart used to illustrate an operation performed when the oil pressure is abnormal in a comparative example.
  • (a) represents the number of revolutions of the engine
  • (b) represents the output from the oil pressure switch 76
  • (c) represents the state of the oil pressure warning lamp 15.
  • the oil pressure warning lamp 15 As described, in the comparative example, if an oil pressure anomaly occurs during operation of the engine 1, the oil pressure warning lamp 15 is turned on, but if the engine 1 is automatically shut down by the idle-stop function, the oil pressure warning lamp 15 is turned off. Accordingly, the driver starts to question whether the oil pressure anomaly alarm is true, so this configuration is not preferable.
  • an anomaly such as a drop in the oil pressure of the engine 1
  • a notification operation for an oil pressure anomaly is performed and, even if the engine 1 is automatically shut down by the idle-stop function during execution of the notification operation, the notification operation is deliberately maintained.
  • This provides an advantage in providing a vehicle with driver usability, in that it is possible to eliminate the need for the driver to gain systematic knowledge about a notification operation for an oil pressure anomaly in advance.
  • hybrid vehicles have an idle-stop function (an automatic engine shutdown and restart function), so it is possible to incorporate the oil pressure monitoring function disclosed in the above embodiment of the present invention. In this case, the same actions and effects as those of the above embodiment can be obtained.
  • a configuration is adopted in which the oil pressure of the engine 1 is detected with the oil pressure switch 76 and an on or off signal is output, but it is also possible to adopt a configuration in which, for example, an oil pressure sensor is used, and the output from the oil pressure sensor is compared with a prescribed threshold value by an appropriate ECU so as to determine whether the oil pressure is normal or abnormal.
  • the vehicle control apparatus of the present invention even if the engine is automatically shutdown by an idle-stop function during execution of a notification operation performed upon the occurrence of an oil pressure anomaly during operation of the engine, it is possible to accurately transmit information on the oil pressure anomaly to the driver. Accordingly, the vehicle control apparatus of the present invention is useful in a vehicle that has an idle-stop function, such as, for example, a vehicle designed to reduce the amount of fuel consumed and lower the amount of exhaust gas emitted such as a hybrid vehicle.
  • an idle-stop function such as, for example, a vehicle designed to reduce the amount of fuel consumed and lower the amount of exhaust gas emitted such as a hybrid vehicle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP08740096A 2007-04-09 2008-04-09 Vehicle control device Withdrawn EP2157293A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007102013A JP2008255968A (ja) 2007-04-09 2007-04-09 車両の制御装置
PCT/JP2008/056993 WO2008126855A1 (ja) 2007-04-09 2008-04-09 車両の制御装置

Publications (1)

Publication Number Publication Date
EP2157293A1 true EP2157293A1 (en) 2010-02-24

Family

ID=39863952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08740096A Withdrawn EP2157293A1 (en) 2007-04-09 2008-04-09 Vehicle control device

Country Status (5)

Country Link
US (1) US20100299045A1 (ja)
EP (1) EP2157293A1 (ja)
JP (1) JP2008255968A (ja)
CN (1) CN101657613A (ja)
WO (1) WO2008126855A1 (ja)

Cited By (1)

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DE102011053176A1 (de) * 2011-08-31 2013-02-28 Ino8 Pty Ltd Verfahren und Vorrichtung zur Leckagedetektion eines Fahrzeug-Schmiersystems

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CN110094286A (zh) * 2010-10-20 2019-08-06 马克卡车公司 用于运行混合动力系统的方法和混合动力系统
US8739746B2 (en) 2012-01-31 2014-06-03 Ford Global Technologies, Llc Variable oil pump diagnostic
JP6164197B2 (ja) * 2014-11-13 2017-07-19 株式会社デンソー 電子制御装置
DE102015116262A1 (de) * 2015-09-25 2017-03-30 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zum Betreiben eines Antriebssystems für ein Kraftfahrzeug mit einer Beschleunigungsüberwachung
CN114542237A (zh) * 2020-11-26 2022-05-27 长城汽车股份有限公司 发动机机油压力检测的方法、装置、存储介质和电子设备

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011053176A1 (de) * 2011-08-31 2013-02-28 Ino8 Pty Ltd Verfahren und Vorrichtung zur Leckagedetektion eines Fahrzeug-Schmiersystems
WO2013030291A1 (de) 2011-08-31 2013-03-07 Ino8 Pty Ltd Verfahren und vorrichtung zur leckagedetektion eines fahrzeug-schmiersystems

Also Published As

Publication number Publication date
CN101657613A (zh) 2010-02-24
JP2008255968A (ja) 2008-10-23
WO2008126855A1 (ja) 2008-10-23
US20100299045A1 (en) 2010-11-25

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