Fuel supply control method having fail-safe function for abnormalities in engine temperature detecting means at the start of the engine
First Claim
1. A method for electronically controlling the quantity of fuel supply to an internal combustion engine including detecting a temperature of the engine, detecting an abnormality in an engine temperature detecting signal, employing a dummy signal indicative of engine temperature in place of said temperature detecting signal when said abnormality is detected, and increasing the quantity of fuel being supplied to the engine with the lapse of time by the use of dummy signal.
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Accused Products
Abstract
A fuel supply control method for electronically controlling the quantity of fuel being supplied to an internal combustion engine at the start of the engine, in response to values of engine control parameters including at least the engine temperature. When there is an abnormality in an engine temperature detecting means that detects the value of the engine temperature, while the engine is operating in a predetermined starting operating condition, control is effected by gradually increasing the quantity of fuel being supplied to the engine with the progress of time starting from a time the engine starter is switched on, by the use of a predetermined dummy signal indicative of engine temperature, in place of an output signal from the aforementioned engine temperature detecting means. Preferably, the value of the above dummy signal is set so as to change from a higher engine temperature value to lower engine temperature values in a successive and stepwise manner at an interval of a predetermined period of time. Also, the value of the above dummy signal is maintained at a predetermined value in the post-starting operating condition of the engine.
14 Citations
15 Claims
- 1. A method for electronically controlling the quantity of fuel supply to an internal combustion engine including detecting a temperature of the engine, detecting an abnormality in an engine temperature detecting signal, employing a dummy signal indicative of engine temperature in place of said temperature detecting signal when said abnormality is detected, and increasing the quantity of fuel being supplied to the engine with the lapse of time by the use of dummy signal.
- 5. Apparatus for electronically controlling the quantity of fuel supply to an internal combustion engine having means for detecting a temperature of the engine and producing a temperature signal, comprising means for detecting an abnormality in the functioning of said engine temperature detecting means, means for employing a dummy signal indicative of engine temperature in place of said temperature signal when said abnormality is detected, and means for increasing the quantity of fuel being supplied to the engine with the lapse of time by the use of the value of said predetermined dummy signal.
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9. A method for electronically controlling the quantity of fuel being supplied to an internal combustion engine having a starter and a means for detecting a temperature of the engine, at the start of the engine in response to values of engine control parameters including at least the temperature of the engine detected by said engine temperature detecting means, the method comprising the steps of:
- (a) detecting an abnormality in the functioning of said engine temperature detecting means;
(b) employing a predetermined dummy signal indicative of engine temperature in place of a signal outputted by said engine temperature detecting means, for control of the quantity of fuel being supplied to the engine, when an abnormality is detected in the functioning of said engine temperature detecting means; and
(c) gradually increasing the quantity of fuel being supplied to the engine with the lapse of time starting from a time said starter is switched on, by the use of the value of said predetermined dummy signal when an abnormality is detected in the functioning of said engine temperature detecting means while the engine is operating in a predetermined starting condition. - View Dependent Claims (10, 11, 12, 13, 14)
- (a) detecting an abnormality in the functioning of said engine temperature detecting means;
Specification