Engine control system
First Claim
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1. An engine control system of a type in which engine control data necessary for controlling at least one of ignition timing and fuel supply amount of an engine is calculated for each of a plurality of cylinders, said control system comprising:
- rotation angular speed detection means for sequentially and independently detecting rotation angular speeds of the engine crankshaft during timing periods of substantially identical predetermined crankshaft rotation angle having a duration within 720/2N which straddle the point of highest crankshaft rotation speed for each cylinder (N indicating the number of cylinders of the engine); and
data calculation means for calculating rotation speed data for each cylinder in response to angular speeds detected by said rotation angular speed detection means during said timing periods which straddle only said point of highest crankshaft rotation speed, said engine control data being calculated by using the rotation speed-dependent data for each cylinder.
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Abstract
In an engine control system of the type in which engine control data is calculated for each of a plurality of cylinders, rotation angular speeds of the crank shaft are sequentially detected as individual pistons of the plurality of cylinders take an identical, predetermined stroke position, for example, top speed position and rotation speed data and control data are calculated on the basis of the detected rotation angular speed.
42 Citations
12 Claims
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1. An engine control system of a type in which engine control data necessary for controlling at least one of ignition timing and fuel supply amount of an engine is calculated for each of a plurality of cylinders, said control system comprising:
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rotation angular speed detection means for sequentially and independently detecting rotation angular speeds of the engine crankshaft during timing periods of substantially identical predetermined crankshaft rotation angle having a duration within 720/2N which straddle the point of highest crankshaft rotation speed for each cylinder (N indicating the number of cylinders of the engine); and data calculation means for calculating rotation speed data for each cylinder in response to angular speeds detected by said rotation angular speed detection means during said timing periods which straddle only said point of highest crankshaft rotation speed, said engine control data being calculated by using the rotation speed-dependent data for each cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An engine control system of a type in which engine control data necessary for controlling at least one of ignition timing and fuel supply amount of an engine is calculated for each of a plurality of cylinders, said control system comprising:
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rotation angular speed detection means for sequentially and independently detecting rotation angular speeds of the engine crankshaft during timing periods of substantially identical predetermined crankshaft rotation angle; data calculation means for calculating rotation speed data for each cylinder in response to angular speeds detected by said rotation angular speed detection means, said engine control data being calculated by using the rotation speed-dependent data for each cylinder; and means for suspending data detection for a predetermined time when a difference Δ
Ni between angular speed data Ni detected for a current timing period i and angular speed data Ni-1 detected for an immediately preceding timing period i-1 exceeds a predetermined value and resuming data detection at a cylinder succeeding a cylinder at which the data Ni is detected.
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10. An engine control system of a type in which engine control data necessary for controlling at least one of ignition timing and fuel supply amount of an engine is calculated for each of a plurality of cylinders, said control system comprising:
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rotation angular speed detection means for sequentially and independently detecting rotation angular speeds of the engine crankshaft during timing periods of substantially identical predetermined crankshaft rotation angle having a duration within 720/2N only in the vicinity of highest crankshaft rotation speed for each cylinder (N indicating the number of cylinders of the engine); and data calculation means for calculating rotation speed data for each cylinder in response to angular speeds detected by said rotation angular speed detection means, said engine control data being calculated by using the rotation speed-dependent data for each cylinder. - View Dependent Claims (11, 12)
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Specification