US20050229880A1 - Valve actuation controlling apparatus and method for engine - Google Patents

Valve actuation controlling apparatus and method for engine Download PDF

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Publication number
US20050229880A1
US20050229880A1 US11/090,216 US9021605A US2005229880A1 US 20050229880 A1 US20050229880 A1 US 20050229880A1 US 9021605 A US9021605 A US 9021605A US 2005229880 A1 US2005229880 A1 US 2005229880A1
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United States
Prior art keywords
engine
working angle
angle
intake valve
working
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Abandoned
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US11/090,216
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English (en)
Inventor
Akira Hashizume
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Toyota Motor Corp
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Individual
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Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASHIZUME, AKIRA
Publication of US20050229880A1 publication Critical patent/US20050229880A1/en
Abandoned 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
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0223—Variable control of the intake valves only
    • F02D13/0234—Variable control of the intake valves only changing the valve timing only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0005—Controlling intake air during deceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/03—Stopping; Stalling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a valve actuation controlling apparatus and method applied to an engine equipped with a variable working-angle control mechanism which varies the working angle of intake valves.
  • variable valve mechanisms which vary valve characteristics of intake valves and exhaust valves.
  • variable valve lift and working-angle control mechanisms which vary valve lifts and working angles of intake and exhaust valves.
  • Japanese Laid-Open Patent Publications No. 2002-89303 and No. 2002-61522 each disclose a valve actuation controlling apparatus that presets the valve actuation of intake valves to be suitable for securing engine starting characteristics immediately before the engine stops, thereby preparing for a next engine start. As shown in FIG. 8 , immediately before the engine stops, that is after commanding the engine to stop, the valve actuation controlling apparatus as disclosed in Japanese Laid-Open Patent Publications No. 2002-89303 and No. 2002-61522 reduces the valve lift and the working angle ⁇ of the intake valves compared to those during idling of the engine, and advances the center ⁇ of the working angle.
  • intake valve closing time IVC is advanced far ahead of a bottom dead center BDC and a compression ratio of air in a cylinder is reduced, causing decompression to occur during starting of the engine. Also, if the lift is reduced and valve-opening area of the intake valve when opened is reduced, velocity of air flow into the cylinder is increased, thereby intensifying air flow in the cylinder during starting of the engine.
  • valve actuation controlling apparatus and method that improve engine starting characteristics.
  • a valve actuation controlling apparatus applied to an engine equipped with a variable working-angle control mechanism which varies working angle of an intake valve is provided. After commanding the engine to stop, the valve actuation controlling apparatus controls the variable working-angle control mechanism to increase the working angle of the intake valve in preparation for restarting of the engine.
  • the present invention provides anther valve actuation controlling apparatus applied to an engine equipped with a variable working-angle control mechanism which varies working angle of an intake valve. After commanding the engine to stop, the valve actuation controlling apparatus controls the variable working-angle control mechanism to increase the working angle of the intake valve in preparation for restarting of the engine, and varies the increased working angle according to whether a stopping requirement of the engine is satisfied.
  • the present invention also provides an engine having a variable working-angle control mechanism which varies working angle of an intake valve and a valve actuation controlling apparatus. After commanding the engine to stop, the valve actuation controlling apparatus controls the variable working-angle control mechanism to increase the working angle of the intake valve in preparation for restarting of the engine.
  • the present invention provides another engine having a variable working-angle control mechanism which varies working angle of an intake valve and a valve actuation controlling apparatus. After commanding the engine to stop, the valve actuation controlling apparatus controls the variable working-angle control mechanism to increase the working angle of the intake valve in preparation for restarting of the engine, and varies the increased working angle according to whether a stopping requirement of the engine is satisfied.
  • the present invention provides a valve actuation controlling method applied to an engine equipped with a variable working-angle control mechanism which varies working angle of an intake valve.
  • the method includes controlling the variable working-angle control mechanism to increase the working angle of the intake valve in preparation for restarting of the engine, after commanding the engine to stop.
  • the present invention provides another valve actuation controlling method applied to an engine equipped with a variable working-angle control mechanism which varies working angle of an intake valve.
  • the method includes: controlling the variable working-angle control mechanism to increase the working angle of the intake valve in preparation for restarting of the engine, after commanding the engine to stop; and varying the increased working angle according to whether a stopping requirement of the engine is satisfied.
  • FIG. 1 is a schematic diagram showing an engine control system according to one embodiment of the present invention
  • FIG. 2 ( a ) is a graph showing changes in valve actuation in a variable phase mechanism
  • FIG. 2 ( b ) is a graph showing changes in valve actuation in a variable working-angle control mechanism
  • FIG. 3 is a diagram outlining automatic stop/restart control
  • FIG. 4 is a flowchart of a working angle setting process during engine stopping period
  • FIG. 5 ( a ) is a diagram showing a setting of working angle of the intake valve after a manual engine stop made by the automatic stop/restart control;
  • FIG. 5 ( b ) is a diagram showing a setting of the working angle of the intake valve after an automatic engine stop made by the automatic stop/restart control;
  • FIG. 6 is a time chart showing a control in a case where the ignition switch is turned off
  • FIG. 7 is a time chart showing a control in a case where the engine is automatically stopped.
  • FIG. 8 is a diagram showing valve actuation setting of an intake valve when an engine stops in a case of a prior art valve actuation controlling apparatus.
  • an engine 10 includes an intake passage 11 , a combustion chamber 12 , and an exhaust passage 13 .
  • Installed in the intake passage 11 are an air flowmeter 14 which detects an air flow rate in the intake passage 11 and a throttle valve 15 which changes the air flow rate by changing the flow area of the intake passage 11 .
  • the intake passage 11 is connected to the combustion chamber 12 via an intake valve 16 .
  • the combustion chamber 12 is connected to the exhaust passage 13 via an exhaust valve 17 .
  • the intake valve 16 and exhaust valve 17 are driven according to rotation of the engine 10 .
  • the intake valve 16 opens and closes the intake passage 11 to the combustion chamber 12
  • the exhaust valve 17 opens and closes the exhaust passage 13 to the combustion chamber 12 .
  • a valve operating system of the intake valve 16 has a variable phase mechanism 18 and a variable working-angle control mechanism 19 .
  • the variable phase mechanism 18 continuously changes a working angle center ⁇ of the intake valve 16 as shown in FIG. 2 ( a ).
  • the variable phase mechanism 18 employed in this engine 10 changes the working angle center ⁇ by changing a rotational phase of a camshaft with respect to a crankshaft.
  • the variable working-angle control mechanism 19 continuously changes the working angle ⁇ of the intake valve 16 as shown in FIG. 2 ( b ).
  • the variable working-angle control mechanism 19 increases the lift of the intake valve 16 in accordance with an increase of the working angle ⁇ , and decreases the lift of the intake valve 16 in accordance with a decrease of the working angle ⁇ .
  • the working angle of the intake valve 16 is the number of degrees the intake valve 16 stays open.
  • Both of the variable phase mechanism 18 and the variable working-angle control mechanism 19 are driven hydraulically.
  • the hydraulic power is supplied from an oil pump that is driven by rotation of the crankshaft of the engine 10 .
  • the electronic controller 20 is equipped with a central processing unit (CPU) which runs various computational processes for controlling the engine 10 , a read-only memory (ROM) which stores control programs and data, a random access memory which records computational results from the CPU and data from sensors, and input and output ports used to exchange data with external devices.
  • CPU central processing unit
  • ROM read-only memory
  • random access memory which records computational results from the CPU and data from sensors
  • input and output ports used to exchange data with external devices.
  • the input ports of the electronic controller 20 are connected with the air flowmeter 14 , a throttle sensor 21 , a valve timing sensor 22 (VT sensor 22 ), and a valve lift sensor (VL sensor 23 ).
  • the throttle sensor 21 detects the opening degree (throttle opening degree Ta) of the throttle valve 15 .
  • the VT sensor 22 detects the current working angle center ⁇ of the intake valve 16 .
  • the VL sensor 23 detects the current working angle ⁇ of the intake valve 16 .
  • the input ports of the electronic controller 20 are connected with various sensors which detect operating condition of the engine 10 and driving-condition of the vehicle.
  • the output ports of the electronic controller 20 are connected with various actuators used to control the engine 10 as well as with the throttle valve 15 , the variable phase mechanism 18 , and the variable working-angle control mechanism 19 .
  • the electronic controller 20 controls the actuators based on detection results produced by the various sensors, and thereby performs various types of control over the engine 10 .
  • valve actuation control of the intake valve 16 is performed as follows. First, the electronic controller 20 calculates target values for the working angle center ⁇ and the working angle ⁇ of the intake valve 16 suitable for the current operating state based on the rotational speed of the engine and depression of an accelerator pedal detected by sensors. The electronic controller 20 performs feedback control of the variable phase mechanism 18 and the variable working-angle control mechanism 19 such that the current working angle center ⁇ and working angle ⁇ detected by the VT sensor 22 and the VL sensor 23 of the intake valve 16 seek the calculated respective target values. This makes it possible to obtain optimum valve actuation of the intake valve 16 according to the current operating state of the engine.
  • the electronic controller 20 controls the opening degree of the throttle valve 15 along with control of the working angle ⁇ . This secures a required intake air amount Ga regardless of changes made by the variable working-angle control mechanism 19 to the working angle ⁇ and the lift of the intake valve 16 .
  • automatic stop/restart control i.e., “automatic idling stop control”
  • automatic stop/restart control involves stopping the engine 10 automatically, waiting in a stopped state, and restarting the engine in response to the driver's action to start the vehicle.
  • the automatic stop/restart control is performed by the electronic controller 20 , and will be outlined below with reference to FIG. 3 .
  • Mode 0 which represents normal engine-stopped state.
  • Mode 1 which represents normal engine-operating state.
  • the electronic controller 20 If the ignition switch is turned off during normal operation of the engine 10 in Mode 1 , the electronic controller 20 performs a normal engine stopping process to stop the engine 10 and shifts to Mode 0 . After performing necessary stop processes, the electronic controller 20 cuts off power to itself.
  • the electronic controller 20 shifts to Mode 2 in which it performs an engine stop process to stop the engine 10 automatically.
  • the automatic stopping requirements are satisfied, for example, if all the following conditions (a1) to (a6) are met.
  • the vehicle speed is equal to or lower than a predetermined speed.
  • Coolant temperature is equal to or higher than a predetermined temperature Ta and the engine 10 has been warmed up.
  • Hydraulic fluid temperature of an automatic transmission is equal to or higher than a predetermined temperature.
  • Car battery level is equal to or above a predetermined value.
  • Mode 2 the electronic controller 20 stops fuel supply, and thereby stops the engine 10 .
  • Mode 3 the control mode of the electronic controller 20 shifts to Mode 3 , which represents engine-stopped state brought about by the automatic stop/restart control.
  • Mode 3 when the engine 10 is on standby and in a stopped state, if restart requirements of the engine 10 are satisfied, the electronic controller 20 shifts to Mode 4 in which it performs a restart process to restart the engine 10 automatically.
  • the restart requirements are satisfied, for example, if any of the following conditions (b1) to (b4) is met.
  • Mode 4 As the control mode shifts to Mode 4 , the engine 10 is restarted. When the engine 10 is restarted successfully, the control mode of the electronic controller 20 shifts to Mode 1 .
  • Mode 3 i.e., in an engine-stopped state brought about by the automatic stop/restart control, if a malfunction occurs during restarting of the engine 10 in Mode 4 due to turning off of the ignition switch or an abnormality in the system, the electronic controller 20 shifts forcibly to Mode 0 . In that case, the engine 10 is restarted only if the driver operates the ignition switch directly. That is, the engine 10 is not restarted automatically.
  • the working angle ⁇ of the intake valve 16 is set to an optimum value in preparation for the next restarting of the engine 10 . Details of the stop-time working angle setting process will be described below with reference to FIGS. 4 to 7 .
  • the engine 10 of this embodiment can be stopped in two ways: manual stop via deactivation of the ignition switch and automatic stop via the automatic stop/restart control.
  • the restarting is a hot start in which the engine 10 is restarted in a sufficiently hot state.
  • the manual stop which is made through deactivation of the ignition switch, it is necessary to allow for both hot start and cold start because it is difficult to predict situations in which the engine is started.
  • the working angle ⁇ of the intake valve 16 is varied between the automatic stop based on automatic stop/restart control and manual stop based on deactivation of the ignition switch.
  • an optimum working angle ⁇ is preset for the intake valve 16 according to expected situations in which the engine 10 will be started, taking into consideration the difference between automatic stop and manual stop.
  • FIG. 4 shows a flowchart of the stop-time working angle setting process according to this embodiment.
  • the electronic controller 20 determines whether the engine 10 is currently in a manually stopped state based on deactivation of the ignition switch. If the engine 10 is in a manually stopped state (S 104 : YES), the electronic controller 20 sets the stop-time target working angle ⁇ t to a relatively large value (e.g., 200° CA) in step 106 , and then it goes to step 110 . If the engine 10 is not in a manually stopped state (S 104 : NO), i.e., if the engine 10 is not currently stopped, the electronic controller 20 temporarily suspends the routine. In this case, normal working angle control is performed according to the engine-operating state as described above.
  • a relatively large value e.g. 200° CA
  • step 110 the electronic controller 20 controls the variable working-angle control mechanism 19 such that the current working angle ⁇ of the intake valve 16 seeks the target working angle ⁇ t set in step 102 or step 106 .
  • the engine 10 is normally operated under low loads and the working angle ⁇ of the intake valve 16 is set to a relatively small value.
  • the working angle ⁇ of the intake valve 16 is increased through the working angle control.
  • the electronic controller 20 also changes the working angle center ⁇ of the intake valve 16 as required.
  • the electronic controller 20 performs cooperative control in step 112 to regulate the throttle opening Ta in response to increases in the working angle ⁇ of the intake valve 16 , and then the electronic controller 20 temporarily suspends the routine.
  • the cooperative control involves decreasing the throttle opening Ta to curb any increase in the intake air amount Ga resulting from increases in the working angle ⁇ of the intake valve 16 , and increasing the throttle opening Ta to check any decrease in the intake air amount Ga resulting from increases in the working angle ⁇ of the intake valve 16 .
  • the electronic controller 20 executes the above routine periodically while it is active.
  • the working angle ⁇ of the intake valve 16 is set to a relatively large value (e.g., 200° CA) by the stop-time working angle setting process. In so doing, the valve closing time IVC of the intake valve 16 is set to a point relatively early in the middle period of the compression stroke as shown in FIG. 5 ( a ). Since both hot start and cold start are anticipated in the case of restarting after a manual stop as described above, it is necessary to set working angle ⁇ which can accommodate both hot start and cold start properly.
  • a relatively large value e.g. 200° CA
  • the target working angle ⁇ t of the intake valve 16 is set such that a compression ratio of air in the cylinder (combustion chamber 12 ) is equal to or lower than the upper limit of a range in which knocking is avoided during a hot start of the engine 10 , and is equal to or higher than the lower limit of a range in which sufficient torque is generated during a cold start of the engine 10 . Consequently, during restarting, the engine 10 can be started under increased friction in case of a cold start, and knocking can be avoided in case of a hot start. Also, decompression occurs due to the reduced compression ratio.
  • the working angle center ⁇ of the intake valve 16 is delayed more than during low-load operation of the engine 10 such as idling.
  • the working angle ⁇ of the intake valve 16 is set to the maximum working angle ⁇ max by the stop-time working angle setting process.
  • the valve closing time IVC of the intake valve 16 is set in the middle period of the compression stroke, lagging greatly behind the bottom dead center BDC as shown in FIG. 5 ( b ).
  • the restarting is expected to be a hot start. Since only a hot start is expected, the engine 10 requires only small torque during starting, obviating the need to secure a large intake air amount Ga. Consequently, the valve closing time IVC of the intake valve 16 is allowed to be delayed greatly in order to maximize decompression.
  • the working angle ⁇ of the intake valve 16 is set to the maximum working angle ⁇ max, allowing the valve closing time IVC to be delayed to the maximum extent possible.
  • the working angle center ⁇ of the intake valve 16 is set to the same phase as during the manual stop.
  • FIG. 6 shows in a manual stop in the stop-time working angle setting process.
  • the ignition switch is turned off at time t 1 , i.e., if an engine stop command is given manually, the working angle ⁇ of the intake valve 16 is increased gradually to the target working angle ⁇ t (200° CA) .
  • the valve closing time IVC of the intake valve 16 is gradually delayed toward the bottom dead center BDC.
  • the working angle ⁇ of the intake valve 16 reaches the target working angle ⁇ t (e.g., 200° CA)
  • the working angle ⁇ stops increasing and is held at the target working angle ⁇ t.
  • the electronic controller 20 finishes the engine stop process and cuts off power to itself.
  • FIG. 7 shows in an automatic stop in the stop-time working angle setting process.
  • the electronic controller 20 shifts from Mode 1 to Mode 2 , i.e., if an engine stop command is given by the automatic stop/restart control, the working angle ⁇ of the intake valve 16 increases gradually to the maximum working angle ⁇ max (260° CA), i.e., to the target working angle ⁇ t.
  • the valve closing time IVC of the intake valve 16 is delayed toward the bottom dead center BDC, and the intake air amount Ga is increased accordingly.
  • the cooperative control gradually decreases the throttle opening Ta to curb the increases in the intake air amount Ga.
  • the electronic controller 20 After commanding the engine 10 to stop, the electronic controller 20 according to this embodiment increases the working angle ⁇ of the intake valve 16 far more greatly than for a low-load operation, in preparation for restarting the engine 10 .
  • the working angle ⁇ of the intake valve 16 is increased to such an extent that the valve closing time IVC of the intake valve 16 coincides with the middle period of the compression stroke. Consequently, the compression ratio of air in the cylinder is reduced, causing decompression to occur. This reduces the torque required for the crankshaft to rotate. The restart of the engine 10 is therefore facilitated. Also, since decompression occurs even if intake air is not throttled by the intake valve 16 , it is possible to prevent compression end temperature from rising due to frictional heat and to avoid eventual knocking during a hot start of the engine 10 .
  • the target working angle ⁇ t for increases in the working angle ⁇ is varied between automatic stop and manual stop of the engine 10 . More specifically, in the case of the automatic stop of the engine 10 , the target working angle ⁇ t is set to the maximum working angle ⁇ max of the variable working-angle control mechanism 19 . In the case of the manual stop of the engine 10 , the target working angle ⁇ t is set such that the compression ratio of air in the cylinder is equal to or lower than the upper limit of a range in which knocking can be avoided during a hot start of the engine, and is equal to or higher than the lower limit of a range in which sufficient torque can be generated during a cold start of the engine. This makes it possible to set a desirable working angle according to conceivable situations in which the engine 10 will be started in the case of both automatic stop and manual stop.
  • cooperative control of the intake valve 16 is performed in response to increases in the working angle ⁇ of the intake valve 16 at the time of an engine stop. This reduces variations in the intake air amount Ga resulting from increases in the working angle ⁇ of the intake valve 16 during the engine stop, making it possible to reduce variations in the rotational speed of the engine 10 caused by changes in the compression ratio.
  • the working angle center ⁇ of the intake valve 16 is changed along with increases in the working angle ⁇ of the intake valve 16 at the time of the engine stop. This makes the valve actuation of the intake valve 16 at the time of restarting more suitable for starting the engine 10 .
  • the settings of the target working angle ⁇ t in the stop-time working angle setting process at the time of both manual stop and automatic stop may be changed as required according to the characteristics of the given engine. If the target working angle ⁇ t of the intake valve 16 at the time of a manual stop is set to such a value which allows for conceivable situations in which the engine will be restarted after both automatic stop and manual stop, it is possible to ensure proper engine starting characteristics.
  • the working angle center ⁇ may be varied between automatic stop and manual stop. This permits the valve actuation of the intake valve 16 at restart of the engine 10 to be finely adjusted. Consequently, the starting characteristics of the engine 10 can be further improved depending on the adjustment.
  • the target working angle ⁇ t at the stop-time working angle setting process of the above embodiments may be varied according to the engine stopping requirements in the automatic stop and manual stop. For example, if outside air temperature is very low when the engine stops, it is expected that the engine 10 is restarted at a very low temperature, and thus the target working angle ⁇ t may be set to a smaller value than when temperature is relatively high. In such a case, the present invention is also applicable to engines which do not perform automatic stop/restart control.
  • the cooperative control of the throttle opening Ta performed along with increases in the working angle ⁇ may be omitted.
  • the cooperative control of the throttle opening Ta may also be omitted if variations in the rotational speed of the engine resulting from increases in the working angle ⁇ are small.
  • the control for increasing the working angle ⁇ when the engine stops can be applied, in the same or similar manner as the above embodiments, to an engine which has only a variable working-angle control mechanism 19 , but does not have a variable phase mechanism 18 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve Device For Special Equipments (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US11/090,216 2004-04-15 2005-03-28 Valve actuation controlling apparatus and method for engine Abandoned US20050229880A1 (en)

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JP2004120486A JP2005299594A (ja) 2004-04-15 2004-04-15 エンジンのバルブ特性制御装置
JP2004-120486 2004-04-15

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EP (1) EP1586761A2 (de)
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DE102015106262B3 (de) * 2015-04-23 2016-09-22 Hilite Germany Gmbh Verfahren zum Betreiben einer hydraulisch betriebenen Verstelleranordnung
US9527501B2 (en) 2013-11-12 2016-12-27 Toyoda Jidosha Kabushiki Kaisha Hybrid vehicle
US9725085B2 (en) 2014-02-12 2017-08-08 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle with variable valve timing failure detection with consequent reduction of engine output range range and increase of the state of charge
US10001036B2 (en) 2013-06-19 2018-06-19 Borgwarner Inc. Variable camshaft timing mechanism with a lock pin engaged by oil pressure
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