CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE

• US 20090132154A1
• Filed: 01/27/2006
• Published: 05/21/2009
• Est. Priority Date: 02/08/2005
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: KAWASAKI, Takashi, FUWA, Naohide, Takeuchi, Yasuomi
• Granted Patent: US 7,848,873 B2
• Time in Patent Office: Days
• US Class Current: 701/112
• CPC Class Codes: F01L 13/00 Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
• CPC Class Codes: F01L 2800/03 Stopping; Stalling
• CPC Class Codes: F02D 11/10 of the electric type
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2041/0095 Synchronisation of the cylinders during engine shutdown
• CPC Class Codes: F02D 41/00 Electrical control of supply of combustible mixture or its constituents F02D43/00 takes precedence ; control of engine starters F02N11/08, electrical control of engine ignition timing F02P5/145
• CPC Class Codes: F02D 41/042 for stopping the engine

Abstract

An electronic control unit 9 performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped. During non-execution of the delay control, the electronic control unit 9 adjusts the opening degree of a throttle valve 38 according to an accelerator pedal depression degree. During the execution of the delay control, the electronic control unit 9 adjusts the opening degree of a throttle valve 38 such that the opening degree becomes less than the opening degree during the non-execution of the delay control.

Claims

1. :

A control apparatus for an internal combustion engine, comprising;

delay means that performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped;

changing means that actuates a variable valve actuation mechanism during the execution of the delay control, thereby changing the valve characteristics of an engine valve to valve characteristics for starting the engine;

setting means that sets an engine control amount that corresponds to engine manipulation performed by a driver; and

limiting means that causes the engine control amount set during the execution of the delay control to be less than the engine control amount during non-execution of the delay control,

wherein the setting means sets an opening degree of a throttle valve according to a depression degree of an accelerator pedal,

wherein the limiting means causes the throttle valve opening degree set during the execution of the delay control to be less than the throttle valve opening degree during non-execution of the delay control.

2. :

The control apparatus according to claim 1, wherein the limiting means, during the execution of the delay control, inhibits setting of the throttle valve opening degree that corresponds to the accelerator pedal depression degree.

3. :

A control apparatus for an internal combustion engine, comprising;

delay means that performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped;

changing means that actuates a variable valve actuation mechanism during execution of the delay control, thereby changing valve characteristics of an engine valve to valve characteristics for starting the engine;

determination means that determines whether the engine stop request is an urgent stop request; and

inhibiting means, wherein, when the determination means determines that the stop request is an urgent stop request, the inhibiting means inhibits the execution of the delay control.

4. :

The control apparatus according to claim 3, wherein, when the engine stop request is made during cranking of the engine, the determination means determines that the engine stop request is the urgent stop request.

5. :

The control apparatus according to claim 3, wherein, when the engine stop request is made with the hood of the vehicle mounting the engine opened, the determination means determines that the engine stop request is the urgent stop request.

6. :

The control apparatus according to claim 3, wherein the determination means determines whether the engine stop request is the urgent stop request based on an engine speed at the time when the engine stop request is made.

7. :

A control apparatus for an internal combustion engine, comprising;

delay means that performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped;

changing means that actuates a variable valve actuation mechanism during the execution of the delay control, thereby changing the valve characteristics of an engine valve to valve characteristics for starting the engine; and

a stop mechanism that stops wheels of a vehicle mounting the engine, wherein the stop mechanism is actuated during the execution of the delay control.

8. :

The control apparatus according to claim 7, wherein the stop mechanism comprises brakes actuated by an actuator.

9. :

A control apparatus for an internal combustion engine, comprising;

a main relay formed in a circuit independent from an engine stopping switch, the main relay performing and shutting off supply of electricity used for controlling the engine;

a separate relay formed in a circuit independent from the engine stopping switch, the separate relay performing and shutting off the supply of electricity to at least one of a fuel injection valve and an ignition plug;

delay means that performs a delay control for extending the period from when an engine stop request is made by a driver to when the separate relay shuts off the supply of electricity; and

changing means that actuates a variable valve actuation mechanism during execution of the delay control, thereby changing the valve characteristics of an engine valve to valve characteristics for starting the engine,

wherein the main relay performs and shuts off the supply of electricity to the separate relay.

10. :

The control apparatus according to claim 9, wherein a coil of the separate relay is connected to a downstream side of a contact of the main relay.

11. :

A control apparatus for an internal combustion engine, comprising;

a delay section that performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped;

a changing section that actuates a variable valve actuation mechanism during execution of the delay control, thereby changing valve characteristics of an engine valve to valve characteristics for starting the engine;

a setting section that sets an engine control amount that corresponds to engine manipulation performed by a driver; and

a limiting section that causes the engine control amount set during the execution of the delay control to be less than the engine control amount during non-execution of the delay control,

wherein the setting section sets an opening degree of a throttle valve according to a depression degree of an accelerator pedal, and

wherein the limiting section causes the throttle valve opening degree set during the execution of the delay control to be less than the throttle valve opening degree during non-execution of the delay control.

12. :

The control apparatus according to claim 11, wherein the limiting section, during the execution of the delay control, inhibits setting of the throttle valve opening degree that corresponds to the accelerator pedal depression degree.

13. :

A control apparatus for an internal combustion engine, comprising;

a delay section that performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped;

a changing section that actuates a variable valve actuation mechanism during execution of the delay control, thereby changing valve characteristics of an engine valve to valve characteristics for starting the engine;

a determination section that determines whether the engine stop request is an urgent stop request; and

an inhibiting section, wherein, when the determination section determines that the stop request is an urgent stop request, the inhibiting section inhibits the execution of the delay control.

14. :

The control apparatus according to claim 13, wherein, when the engine stop request is made during cranking of the engine, the determination section determines that the engine stop request is the urgent stop request.

15. :

The control apparatus according to claim 13, wherein, when the engine stop request is made with the hood of the vehicle mounting the engine opened, the determination section determines that the engine stop request is the urgent stop request.

16. :

The control apparatus according to claim 13, wherein the determination section determines whether the engine stop request is the urgent stop request based on an engine speed at the time when the engine stop request is made.

17. :

A control apparatus for an internal combustion engine, comprising;

a delay section that performs a delay control for extending the period from when an engine stop request is made to when the engine is actually stopped;

a changing section that actuates a variable valve actuation mechanism during execution of the delay control, thereby changing valve characteristics of an engine valve to valve characteristics for starting the engine; and

a stop mechanism that stops wheels of a vehicle mounting the engine, wherein the stop mechanism is actuated during the execution of the delay control.

18. :

The control apparatus according to claim 17, wherein the stop mechanism comprises brakes actuated by an actuator.

19. :

A control apparatus for an internal combustion engine, comprising;

a main relay formed in a circuit independent from an engine stopping switch, the main relay performing and shutting off supply of electricity used for controlling the engine;

a separate relay formed in a circuit independent from the engine stopping switch, the separate relay performing and shutting off the supply of electricity to at least one of a fuel injection valve and an ignition plug;

a delay section that performs a delay control for extending the period from when an engine stop request is made by a driver to when the separate relay shuts off the supply of electricity; and

a changing section that actuates a variable valve actuation mechanism during the execution of the delay control, thereby changing valve characteristics of an engine valve to valve characteristics for starting the engine,

wherein the main relay performs and shuts off the supply of electricity to the separate relay.

20. :

The control apparatus according to claim 19, wherein a coil of the separate relay is connected to a downstream side of a contact of the main relay.