Control apparatus and control method for internal combustion engine

• US 20040194767A1
• Filed: 03/18/2004
• Published: 10/07/2004
• Est. Priority Date: 04/03/2003
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hashimoto, Hiromasa, Igarashi, Osamu, Sasaki, Shoji, Akita, Koichi
• Granted Patent: US 6,883,324 B2
• Time in Patent Office: Days
• US Class Current: 123/562
• CPC Class Codes: F02B 33/40 of non-positive-displacement type
• CPC Class Codes: F02B 37/04 Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02B 39/10 electric
• CPC Class Codes: F02B 39/16 Other safety measures for, or other control of, pumps
• CPC Class Codes: F02D 2041/2027 Control of the current by pulse width modulation or duty cycle control
• CPC Class Codes: F02D 2200/0404 Throttle position
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/187 using a hot wire flow sensor
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A control apparatus for an internal combustion engine in accordance with the invention includes a supercharger, a bypass passage, a flow amount adjustment device, an operational state detection portion, and a driving time determination portion. The supercharger is connected to an intake passage of an internal combustion engine and is driven by a motor. The bypass passage is provided for the intake passage in such a manner as to bypass the supercharger. By being driven electrically, the flow amount adjustment device can arbitrarily adjust a flow amount of air flowing through the bypass passage. The operational state detection portion detects an operational state of the internal combustion engine. The driving time determination portion determines a time at which the flow rate adjustment device is driven based on a result of detection performed by the operational state detection portion.

Claims

1. A control apparatus for an internal combustion engine, comprising:

a supercharger connected to an intake passage of the internal combustion engine and driven by a motor;

a bypass passage which is provided for the intake passage in such a manner as to bypass the supercharger;

a flow amount adjustment device which arbitrarily adjusts a flow amount of air flowing through the bypass passage by being driven electrically;

an operational state detection portion which detects an operational state of the internal combustion engine; and

a driving time decision portion which decides a time at which the flow amount adjustment device is driven, based on a result of detection performed by the operational state detection portion.

2. The control apparatus according to claim 1, wherein the operational state detection portion determines whether an amount of intake air flowing through the supercharger becomes equal to an amount of intake air flowing through the bypass passage, and the driving time decision portion starts to drive the flow amount adjustment device so as to close the bypass passage when the amount of intake air flowing through the supercharger becomes equal to the amount of intake air flowing through the bypass passage after supercharging by the supercharger is started.

3. The control apparatus according to claim 2, wherein the operational state detection portion determines that the amount of intake air flowing through the supercharger becomes equal to the amount of intake air flowing through the bypass passage when a rotational speed of the supercharger reaches a predetermined rotational speed.

4. The control apparatus according to claim 3, further comprising an intake air amount detector that detects an intake air amount on an upstream side of the bypass passage, wherein the predetermined rotational speed is decided based on the intake air amount detected by the intake air amount detector.

5. The control apparatus according to claim 3, wherein the operational state detection portion detects an engine speed and an engine load of the internal combustion engine, and the predetermined rotational speed is decided based on the detected engine speed and the detected engine load.

6. The control apparatus according to claim 2, wherein the driving time decision portion drives the flow amount adjustment device so as to close the bypass passage immediately after the supercharging by the supercharger is started in a case where the amount of intake air flowing through the bypass passage is equal to or smaller than a predetermined value when the supercharging is started.

7. The control apparatus according to claim 2, wherein the driving time decision portion drives the flow amount adjustment device so as to decrease the amount of air flowing through the bypass passage gradually or stepwise until the bypass passage is completely closed after the supercharging by the supercharger is started.

8. The control apparatus according to claim 7, wherein the flow amount adjustment device includes a valve which opens and closes the bypass passage, and the driving time decision portion decides a speed at which the valve is closed, based on an actual rotational speed of the motor and the predetermined rotational speed.

9. The control apparatus according to claim 2, further comprising controller that controls the motor for the supercharger, wherein the controller gradually increases the rotational speed of the motor until the bypass passage is completely closed after supercharging is started.

10. The control apparatus according to claim 1, further comprising a variable geometry turbocharger which is provided on a downstream side of the supercharger connected to the intake passage;

and a control portion which controls an area of an inlet opening portion through which exhaust gas flows into a turbine of the variable geometry turbocharger, wherein the control portion prohibits the area of the inlet opening portion, through which exhaust gas flows into the turbine, from becoming minimum when supercharging is performed using the motor.

11. The control apparatus according to claim 1, wherein the flow amount adjustment device is provided in the bypass passage at a portion on an upstream side of a portion at which the intake passage and the bypass passage are combined.

12. A control method for an internal combustion engine which includes a supercharger and a bypass passage which is provided for the intake passage in such a manner as to bypass the supercharger, comprising:

detecting an operational state of the internal combustion engine; and

deciding a time at which the bypass passage is closed, based on the detected operational state.