초록 ▼

An engine control system is disclosed which includes engine idle speed control apparatus which implements a closed loop idle speed control by varying the amount of air provided to the engine by an air bypass valve. The control system develops an engine torque polarity signal related to the differenc

An engine control system is disclosed which includes engine idle speed control apparatus which implements a closed loop idle speed control by varying the amount of air provided to the engine by an air bypass valve. The control system develops an engine torque polarity signal related to the difference between actual current manifold air pressure and the average of the manifold air pressure which exists during engine idle. The torque polarity signal is utilized to implement engine deceleration control by selectively providing additional air and/or reduced fuel to the engine to implement engine fuel mixture enleanment during deceleration conditions. The engine idle speed control apparatus calculates an error signal related to the difference between actual engine speed and a calculated desired engine idle speed. When engine speed is close to the desired idle speed and engine throttle is closed, a closed loop engine idle speed control means is enabled which controls engine speed in accordance with both a signal directly proportional to the magnitude of the error signal and an integral signal related to the integral of the error signal. Until the closed loop idle speed control means is enabled, the magnitude of the integral signal is maintained constant at a magnitude related to the magnitude which existed for this signal when the idle speed control means was last enabled. The idle speed control error signal is utilized to control sampling of manifold air pressure to obtain the torque polarity signal.

대표청구항 ▼

An engine control system, comprising: means for sensing actual engine speed and providing a corresponding engine speed magnitude; means for providing a desired engine idle speed level; means for sensing a parameter related to engine fuel consumption and providing a corresponding magnitude in respons

An engine control system, comprising: means for sensing actual engine speed and providing a corresponding engine speed magnitude; means for providing a desired engine idle speed level; means for sensing a parameter related to engine fuel consumption and providing a corresponding magnitude in response thereto; means coupled to said engine speed sensing means, said idle speed level providing means and said fuel consumption sensing means for providing an idle speed fuel consumption reference level magnitude by effectively continuously sampling said sensed fuel consumption parameter magnitude only when said sensed engine speed is within a predetermined range of said desired engine idle speed level and effectively storing a magnitude, determined by said sampled fuel consumption parameter magnitude, as said idle speed fuel consumption level magnitude; means coupled to said idle speed fuel consumption reference level providing means for generating at least one engine control signal representative of torque polarity for the engine in response to at least both said sensed fuel consumption parameter magnitude and said idle speed fuel consumption reference level magnitude; and means coupled to said torque polarity engine control signal generating means for implementing at least one engine control function in response to said engine control signal; wherein the improvement comprises at least one of said idle speed fuel consumption sensing means and said torque polarity signal generating means including speed compensation means for adjusting at least one of said fuel consumption and idle speed fuel consumption level magnitudes as a function of said engine speed magnitude, said speed adjusted magnitude determining said torque polarity engine control signal.