Method and apparatus for electronically controlling fuel injection
First Claim
1. A method of electronically controlling fuel injection in an engine, said engine including an intake passage;
- a throttle valve disposed in said passage;
a fuel injection valve controlled by electric pulses for injecting fuel into said intake passage;
a bypass line running in parallel to a portion of said intake passage in which said throttle valve is disposed;
a control valve for controlling the effective cross sectional area of said bypass line; and
an electronic controlling section for calculating from operational parameters of said engine an amount of fuel to be injected as well as a flow rate of intake air through said bypass line, thereby controlling said fuel injection valve and said control valve, said method comprising the steps of;
storing a value related to one of a mean value of an intake air flow rate while said engine is operating under first conditions in which the temperature of said engine is higher than a predetermined value, said engine is idling and the opening of said control valve is being calculated by using the rotational speed of said engine as a parameter, and a mean value of the amount of fuel that has been injected while said engine is operating under said first conditions; and
calculating, by using said stored value as a parameter, an amount of fuel to be injected during at least one of the following second conditions;
said engine is restarted, the temperature of said engine is lower than a predetermined value, and said engine is lower than a predetermined value, and said engine is accelerating while the temperature of said engine is lower than a predetermined value.
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Accused Products
Abstract
A method of electronically controlling fuel injection in an engine including a bypass line running in parallel to the portion of an intake passage in which a throttle valve is provided. The communicable cross sectional area of the bypass line is controlled so as to maintain the idling speed of an engine at a predetermined desired value. When the engine temperature is higher than a predetermined value, the engine is idling and the communicable cross sectional area of the bypass line is being controlled, a value is stored related to the mean value of the flow rate of intake air or the mean amount of fuel being injected into the engine. When the engine is later being started, when the engine temperature is lower than a predetermined value, or when the engine is accelerating while the engine temperature is yet lower than a predetermined value, the amount of fuel to be injected is calculated by using the value thus stored as a parameter to compensate for internal friction in the engine.
33 Citations
16 Claims
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1. A method of electronically controlling fuel injection in an engine, said engine including an intake passage;
- a throttle valve disposed in said passage;
a fuel injection valve controlled by electric pulses for injecting fuel into said intake passage;
a bypass line running in parallel to a portion of said intake passage in which said throttle valve is disposed;
a control valve for controlling the effective cross sectional area of said bypass line; and
an electronic controlling section for calculating from operational parameters of said engine an amount of fuel to be injected as well as a flow rate of intake air through said bypass line, thereby controlling said fuel injection valve and said control valve, said method comprising the steps of;storing a value related to one of a mean value of an intake air flow rate while said engine is operating under first conditions in which the temperature of said engine is higher than a predetermined value, said engine is idling and the opening of said control valve is being calculated by using the rotational speed of said engine as a parameter, and a mean value of the amount of fuel that has been injected while said engine is operating under said first conditions; and calculating, by using said stored value as a parameter, an amount of fuel to be injected during at least one of the following second conditions;
said engine is restarted, the temperature of said engine is lower than a predetermined value, and said engine is lower than a predetermined value, and said engine is accelerating while the temperature of said engine is lower than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a throttle valve disposed in said passage;
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9. Apparatus for electronically controlling fuel injection in an engine, said engine having an intake passage, and a throttle valve disposed in said passage and a fuel injection valve controlled by electric pulses for injecting fuel into said intake passage, said apparatus comprising:
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a bypass line running in parallel to a portion of said intake passage in which said throttle valve is disposed; a control valve for controlling the effective cross sectional area of said bypass line; and electronic control means for;
(1) adjusting, when said engine is warm and is idling, the rotational speed of said engine to a desired value by controlling said control valve, (2) calculating from operational parameters of said engine in an amount of fuel to be injected during first conditions in which the temperature of said engine is higher than a predetermined value, said engine idling and the opening of said throttle valve is being controlled by using the rotational speed of said engine as a parameter, (3) storing a value related to one of a mean value of an intake air flow rate while said engine is operating under said first conditions, and a means value of the amount of fuel that has been injected while said engine is operating under said first conditions, and (4) calculating, by using said stored value as a parameter, an amount of fuel to be injected during at least one of the following second conditions;
said engine is restarting, the temperature of said engine is lower than a predetermined value, and said engine is accelerating while the temperature of said engine is lower than a predetermined value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification