FUEL PRESSURE CONTROL APPARATUS FOR AN INTERNAL COMBUSTION ENGINE

• US 20090093943A1
• Filed: 08/15/2006
• Published: 04/09/2009
• Est. Priority Date: 08/26/2005
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation), Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation), Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Teraoka, Masahiko, Idogawa, Masanao, Hirowatari, Seiji, Fujiki, Toshitaka
• Granted Patent: US 7,853,398 B2
• Time in Patent Office: Days
• US Class Current: 701/103
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 2250/31 Control of the fuel pressure
• CPC Class Codes: F02D 41/047 Taking into account fuel evaporation or wall wetting; special correction after fuel cut-off F02D41/126
• CPC Class Codes: F02D 41/2445 characterised by a plurality of learning conditions or ranges
• CPC Class Codes: F02D 41/2454 Learning of the air-fuel ratio control
• CPC Class Codes: F02D 41/3836 Controlling the fuel pressure
• CPC Class Codes: F02M 63/024 between the low pressure pump and the high pressure pump

Abstract

The engine ECU executes a program including the step (S320) of setting an upper limit guard value of a fuel pressure by executing low fuel pressure control in the case where a low fuel pressure control execution condition is satisfied with fulfillment of conditions that execution of the low fuel pressure control is permitted, that engine speed NE is lower than a threshold value, and that the atmospheric pressure is higher than a threshold value (S310), and the step (S330) of controlling the fuel pressure to be a target fuel pressure within a range not exceeding the upper limit guard value.

Claims

1. A control apparatus for an engine, comprising:

a control portion controlling a fuel injection mechanism injecting fuel;

an adjusting portion executing one of first control for adjusting a pressure of said fuel to be a first pressure and second control for adjusting the pressure to be a second pressure lower than said first pressure;

a detecting portion detecting an atmospheric pressure; and

a prohibiting portion prohibiting switching from said first control to said second control when the atmospheric pressure is lower than a predetermined pressure.

2. (A control apparatus for an engine, comprising:

a control portion controlling a fuel injection mechanism injecting fuel;

an adjusting portion executing one of first control for adjusting a pressure of said fuel to be a first pressure which changes in accordance with an engine load and second control for adjusting the pressure to be a second pressure which changes in accordance with said engine load to be lower than said first pressure at least in a region where said engine load is lower than a predetermined load and to have a difference with said first pressure smaller when said engine load is high than when said engine load is low; and

a permitting portion permitting switching from said first control to said second control when said engine load is higher than a predetermined load.

12. The control apparatus for an engine according to claim 2, further comprising a prohibiting portion for prohibiting switching from said first control to said second control when said engine load is lower than said predetermined load.

3. A control apparatus for an engine, comprising:

a control portion controlling a fuel injection mechanism injecting fuel;

a correcting portion correcting a fuel injection amount;

an adjusting portion executing one of first control for adjusting a pressure of said fuel to be a first pressure and second control for adjusting the pressure to be a second pressure lower than said first pressure; and

a switching portion switching from said first control to said second control when a correction amount for decreasing the fuel injection amount is greater than a predetermined correction amount.

4. The control apparatus for an engine according to claim 3, wherein said correcting portion performs correction to decrease the fuel injection amount when an air-fuel ratio in said engine is lower than a predetermined air-fuel ratio.

5. A control apparatus for an engine, comprising:

control means for controlling fuel injection means for injecting fuel;

adjusting means for executing one of first control for adjusting a pressure of said fuel to be a first pressure and second control for adjusting the pressure to be a second pressure lower than said first pressure;

detecting means for detecting an atmospheric pressure; and

means for prohibiting switching from said first control to said second control when the atmospheric pressure is lower than a predetermined pressure.

6. A control apparatus for an engine, comprising:

control means for controlling fuel injection means for injecting fuel;

adjusting means for executing one of first control for adjusting a pressure of said fuel to be a first pressure which changes in accordance with an engine load and second control for adjusting the pressure to be a second pressure which changes in accordance with said engine load to be lower than said first pressure at least in a region where said engine load is lower than a predetermined load and to have a difference with said first pressure smaller when said engine load is high than when said engine load is low; and

means for permitting switching from said first control to said second control when said engine load is higher than a predetermined load.

13. The control apparatus for an engine according to claim 6, further comprising prohibiting means for prohibiting switching from said first control to said second control when said engine load is lower than said predetermined load.

7. A control apparatus for an engine, comprising:

control means for controlling fuel injection means for injecting fuel;

correcting means for correcting a fuel injection amount;

adjusting means for executing one of first control for adjusting a pressure of said fuel to be a first pressure and second control for adjusting the pressure to be a second pressure lower than said first pressure; and

means for switching from said first control to said second control when a correction amount for decreasing the fuel injection amount is greater than a predetermined correction amount.

8. The control apparatus for an engine according to claim 7, wherein said correcting means includes means for performing correction to decrease the fuel injection amount when an air-fuel ratio in said engine is lower than a predetermined air-fuel ratio.

9. A control apparatus for an engine, comprising:

an atmospheric pressure sensor detecting an atmospheric pressure; and

an ECU controlling an injector injecting fuel,

said ECU being configured to

execute one of first control for adjusting a pressure of said fuel to be a first pressure and second control for adjusting the pressure to be a second pressure lower than said first pressure, and

prohibit switching from said first control to said second control when the atmospheric pressure is lower than a predetermined pressure.

10. A control apparatus for an engine, comprising an ECU controlling an injector injecting fuel,

said ECU being configured to

execute one of first control for adjusting a pressure of said fuel to be a first pressure which changes in accordance with an engine load and second control for adjusting the pressure to be a second pressure which changes in accordance with said engine load to be lower than said first pressure at least in a region where said engine load is lower than a predetermined load and to have a difference with said first pressure smaller when said engine load is high than when said engine load is low, and

permit switching from said first control to said second control when said engine load is higher than a predetermined load.

14. The control apparatus for an engine according to claim 10, wherein said ECU prohibits switching from said first control to said second control when said engine load is lower than said predetermined load.

11. A control apparatus for an engine, comprising an ECU controlling an injector injecting fuel,

said ECU being configured to

correct a fuel injection amount,

execute one of first control for adjusting a pressure of said fuel to be a first pressure and second control for adjusting the pressure to be a second pressure lower than said first pressure, and

switch from said first control to said second control when a correction amount for decreasing the fuel injection amount is greater than a predetermined correction amount.