Crank angle detection apparatus
First Claim
1. A crank angle detection apparatus comprising:
- a measurement member mounted on a crankshaft of an internal combustion engine or a portion that rotates in synchronization with said crankshaft, said measurement member having a plurality of angular position detection portions arranged at equal intervals in a circumferential direction of said crankshaft and a plurality of reference position detection portions at which a part of said angular position detection portions is missing;
a crank angle sensor arranged at a location adjacent to said measurement member for generating a crank angle signal in the form of a train of pulses corresponding to said angular position detection portions and said reference position detection portions;
a period detection part for detecting signal periods of successive pulses of said crank angle signal;
a reference position determination part for determining a plurality of reference positions based on the signal periods detected by said period detection part;
a counting part for counting the pulses of said crank angle signal to provide a count value thereof; and
a rotational direction determination part for determining the rotational direction of said crankshaft based on the number of pulses of said crank angle signal counted between said plurality of reference positions.
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Accused Products
Abstract
Even if the engine is started from any crank angle position, it is possible to correctly determine the rotational direction of a crankshaft, so that fuel injection or ignition can be stopped when the crankshaft is rotating in the reverse direction. A measurement member has a plurality of angular position detection portions arranged at equal intervals in a circumferential direction of the crankshaft and a plurality of reference position detection portions at which a part of the angular position detection portions is missing. A crank angle sensor is arranged near the measurement member for generating a crank angle signal representative of the rotational position of the crankshaft. A period detector detects periods of pulses of the crank angle signal. A reference position determiner determines a plurality of reference positions based on the signal periods. A counter counts the pulses of the crank angle signal. A rotational direction determiner detects the rotational direction of the crankshaft from the number of pulses counted between a plurality of reference positions.
29 Citations
9 Claims
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1. A crank angle detection apparatus comprising:
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a measurement member mounted on a crankshaft of an internal combustion engine or a portion that rotates in synchronization with said crankshaft, said measurement member having a plurality of angular position detection portions arranged at equal intervals in a circumferential direction of said crankshaft and a plurality of reference position detection portions at which a part of said angular position detection portions is missing;
a crank angle sensor arranged at a location adjacent to said measurement member for generating a crank angle signal in the form of a train of pulses corresponding to said angular position detection portions and said reference position detection portions;
a period detection part for detecting signal periods of successive pulses of said crank angle signal;
a reference position determination part for determining a plurality of reference positions based on the signal periods detected by said period detection part;
a counting part for counting the pulses of said crank angle signal to provide a count value thereof; and
a rotational direction determination part for determining the rotational direction of said crankshaft based on the number of pulses of said crank angle signal counted between said plurality of reference positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification