Control apparatus for internal combustion engine

• US 20020189590A1
• Filed: 08/30/2001
• Published: 12/19/2002
• Est. Priority Date: 06/19/2001
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Nakagawa, Shinji, Ohsuga, Minoru, Iwaki, Hidefumi, Hori, Toshio
• Granted Patent: US 6,666,191 B2
• Time in Patent Office: Days
• US Class Current: 123/480
• CPC Class Codes: F02D 2041/2048 said control involving a limitation, e.g. applying current or voltage limits
• CPC Class Codes: F02D 2200/0404 Throttle position
• CPC Class Codes: F02D 2200/0411 Volumetric efficiency
• CPC Class Codes: F02D 2200/0414 Air temperature
• CPC Class Codes: F02D 2200/1002 Output torque
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 31/009 for maximum speed control
• CPC Class Codes: F02D 41/0047 Controlling exhaust gas recirculation [EGR] temperature control with cooler in recirculation circuit F02M26/33
• CPC Class Codes: F02D 41/045 Detection of accelerating or decelerating state detection thereof in general G01P
• CPC Class Codes: F02D 41/1456 with sensor output signal being linear or quasi-linear with the concentration of oxygen
• CPC Class Codes: F02D 41/1458 with determination means using an estimation
• CPC Class Codes: F02D 41/187 using a hot wire flow sensor

Abstract

Provided is a control apparatus for a fuel priority type internal combustion engine, including a means of directly or indirectly detecting a variation in air density, for correcting a maximum value of the desired fuel volume on a basis of a result of the detection so as to adjust the relationship between an accelerator opening degree and the desired fuel volume, or a shaft torque value and a desired fuel volume are determined in accordance with a fuel volume corresponding to an internal loss and a fuel volume corresponding to a maximum value of the desired fuel volume.

Claims

1. A control apparatus for a fuel priority type internal combustion engine, for computing a desired fuel volume and computing a desired air volume from the desired fuel volume and a desired air-fuel ratio, characterized by:

means for detecting an operating condition of the internal combustion engine;

means for detecting an environmental condition surrounding the internal combustion engine; and

a

means for computing a desired fuel volume for the internal combustion engine in accordance with the operating condition of the internal combustion engine and the environmental condition surrounding the internal combustion engine.

3. A control apparatus as set forth in claim 1 or 2, characterized in that the desired fuel volume computing means computes a desired fuel volume from at lease an accelerator opening degree and a speed of the internal combustion engine.

4. A control apparatus as set forth in claim 1 or 2, characterized in that the means for detecting an environmental condition surrounding the internal combustion engine includes a means for detecting an atmospheric pressure and an atmospheric temperature.

5. A control apparatus as set forth in claim 1 or 2, characterized in that the means for detecting an operating condition of the engine includes a means for detecting an opening degree of an EGR valve, a means for detecting opening and closing timings of variable intake and exhaust valves, and a means for directly or indirectly detecting a charging efficiency of air volume in a cylinder in the internal combustion engine, such as a means for detecting an operating angle of the an intake flow enhancing means (SCV).

6. A control apparatus as set forth in claim 1 or 2, characterized in that the means for detecting an operating condition of the internal combustion engine includes a means for directly or indirectly detecting a torque or a fuel volume required for allowing the internal combustion engine to maintain a desired speed in an idle condition.

7. A control apparatus as set forth in claim 1 or 2, characterized in that the means for detecting an operating condition of the internal combustion engine includes a means for detecting exhaust gas components from the internal combustion engine.

8. A control apparatus as set forth in claim 1 or 2, characterized in that the means for detecting an operating condition of the internal combustion engine includes at least an accelerator opening degree sensor for detecting an accelerator opening degree, a throttle opening degree sensor for detecting a throttle opening degree, and an air volume detecting means for directly or indirectly detecting an air volume flowing into the internal combustion engine.

9. A control apparatus as set forth in claim 8, characterized in that the control apparatus for a fuel priority type internal combustion engine comprises a desired air-fuel ratio computing means for computing a desired air-fuel ratio, and a desired air volume computing means for computing a desired air volume from the desired fuel volume and the desired fuel-air ratio.

10. A control apparatus as set forth in claim 8, characterized in that the control apparatus for a fuel priority type internal combustion engine comprises a desired air-fuel ratio computing means for computing a desired air-fuel ratio, and a desired air volume computing means for computing a desired air volume from the desired fuel volume and the desired fuel-air ratio, and,

the desired fuel volume correction value computing means computes a desired fuel volume correction value when the desired air volume is greater than an actual air volume by a predetermined value, and accelerator opening degree is greater than a predetermined value while a throttle valve opening degree is greater than a predetermined value.

2. A control apparatus for a fuel priority type internal combustion engine, characterized by means for detecting an operating condition of the internal combustion engine;

means for detecting an environmental condition surrounding the internal combustion engine;

a means for computing a desired fuel volume to bed into the internal combustion engine in accordance with the operating condition of the internal combustion engine and the environmental condition surrounding the internal combustion engine, and a means for computing a correction value for the desired fuel volume from the operating condition of the engine, and a condition surrounding the internal combustion engine.

11. A control apparatus as set forth in claim 2 characterized in that the desired fuel volume correction value computing means a maximum value of the desired fuel volume or a gain in a relation between an accelerator opening degree or a throttle opening degree and the desired fuel volume.

12. A control apparatus for an internal combustion engine characterized by means for detecting an operating condition of the internal combustion engine, means for detecting a condition surrounding the internal combustion engine, and a charging efficiency control means for controlling a charging efficiency of an air volume in a cylinder, such as a super charger, and characterized in that the charging efficiency control means is controlled in accordance with an operating condition of the internal combustion engine, and an environmental condition surrounding the internal combustion engine.