US 5,150,680 A · Internal combustion engine control method and apparatus

Abstract

This specification discloses an internal combustion engine control system which meets two conflicting performance requirements in the automotive internal combustion engine. In the control system according to this invention, the operation of the throttle valve is controlled such that the opening angle of the throttle valve of an internal combustion engine changes according to the travel amount of the accelerator pedal in the range from the minimum value to a predetermined value less than the maximum value of the accelerator pedal travel amount of the automobile, and that the throttle valve becomes full open in the range from the predetermined value to the maximum value of the accelerator pedal travel amount. The air-fuel ratio is controlled such that an air-fuel mixture of a first air-fuel ratio is supplied in the range from the minimum value to the predetermined value of the accelerator pedal travel amount, and an air-fuel mixture of a second air-fuel ratio is supplied in the range from the predetermined value to the maximum value of the accelerator pedal travel amount.

Claims15

Dependent claims

An internal combustion engine control method by which the engine output is controlled by controlling a throttle valve of an intake air passage by an accelerator pedal, comprising the steps of:

setting an operation of said throttle valve so that a throttle opening angle changes according to a travel amount of said accelerator pedal in the range from the minimum value to a predetermined value less than the maximum value of said accelerator pedal travel amount and that said throttle valve is in a full-open state in the range from said predetermined value to the maximum value of said accelerator pedal travel amount;
supplying an air-fuel mixture of a first air-fuel ratio in said throttle opening angle range corresponding to the range of said accelerator pedal travel amount from the minimum value until said predetermined value is reached;
and
supplying an air-fuel mixture of a second air-fuel ratio different from said first air-fuel ratio in said throttle opening angle range corresponding to the range of said accelerator pedal travel amount from said predetermined value to the maximum value.

1 more element

An internal combustion engine control apparatus by which the engine output is controlled by controlling a throttle valve of an intake passage by an accelerator pedal, comprising:

means for detecting an accelerator pedal travel amount;
means for detecting a throttle opening angle;
means for driving said throttle valve, arranged between said accelerator pedal and said throttle valve and set such that said throttle opening angle changes according to said accelerator pedal travel amount in a first range of said accelerator pedal travel amount from the minimum value to a predetermined value less than the maximum value, and that said throttle valve is in a full-open state in a second range of said accelerator pedal travel amount from said predetermined value to the maximum value;
means for deciding from a detected value of throttle opening angle whether or not said throttle valve is full open;
and
fuel supply apparatus for supplying an air-fuel mixture of a first air-fuel ratio when a decision is made that said throttle valve is not full open, and supplying an air-fuel mixture of a second air-fuel ratio different from said first air-fuel ratio when a decision is made that said throttle valve is full open.

3 more elements

Dependencies are inferred from the claim text.

Internal combustion engine control method and apparatus

Life of this patent

Internal combustion engine control method and apparatus

Life of this patent

Abstract

Claims15