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Apparatus and method of electronically controlling engine
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Inventors: Shimada, Kousaku; Sekozawa, Teruji; Funabashi, Motohisa;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Nelli; Raymond A.
Assistant Examiner:
Attorney, Agent or Firm: Fay, Sharpe, Beall, Fagan, Minnich & McKee
An electronic engine control method and apparatus, which detects acceleration of a vehicle in the travelling directions, derives its differential or displacement difference, i.e., derivative of acceleration, thereby detects the longitudinal oscillation state of the vehicle in acceleration or deceleration and controls the output torque pattern of the engine so as to cause its phase to be opposite to the phase of the pattern of the derivative of acceleration derived. |
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DETAILED DESCRIPTION A first object of the present invention is to provide a method, and apparatus, for electronically controlling an engine wherein the above described drawbacks of the prior art apparatuses are eliminated and the longitudinal oscillation of a vehicle is detected in acceleration and deceleration to prevent the longitudinal oscillation of the vehicle.
A second object of the present invention is to provide a method, and apparatus, for electronically controlling an engine in which an arbitrary vehicular longitudinal oscillation pattern can be selected in acceleration and deceleration.
In order to achieve the first object, in accordance with the present invention, the acceleration of the vehicle in the longitudinal directions is detected and its differential value or displacement difference, i.
e.
, its acceleration derivative is derived, whereby the longitudinal oscillation state of the vehicle in acceleration and deceleration is detected and the output torque pattern of the engine is so controlled as to be opposite in phase to the pattern of the derivative of the acceleration thus derived.
For controlling the output torque pattern of an engine in accordance with the present invention, the ignition timing advance angle is preferably controlled on the basis of the derivative of acceleration.
By doing so, the longitudinal oscillation of the vehicle in acceleration and deceleration can be effectively prevented.
In accordance with an aspect of the present invention, the acceleration of the vehicle in the longitudinal directions measured by an acceleration sensor disposed on a vehicle is always taken into an engine control unit of an engine control apparatus, and the derivative of acceleration is calculated thereupon.
By paying attention to the derivative of acceleration, longitudinal oscillation of the vehicle can be simply detected even in acceleration or deceleration of the vehicle.
In the engine control unit, the engine output torque is corrected on the basis of the derivative of acceleration thus detected
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Finance 
