Crank angle detecting apparatus for an internal combustion engine
A crank angle detecting apparatus for an internal combustion engine is described which consists of: a crank angle sensor for generating a reference position signal at a reference position in each rotation of the internal combustion engine and a crank angle signal upon each rotation of the internal combustion engine through a fixed angle; counter means for counting the crank angle signals generated by the crank angle sensor and, when its count value has reached a first set value, going to a second set value upon application of the next crank angle signal; decision means for deciding whether the count value of the counter means changed from the first to the second set value prior to the generation of the reference position signal; and control means for controlling the counter means so that when it is decided by the decision means that the count value of the counter means did not change from the first set value to the second set value prior to the generation of the reference position signal, the counter means is made to have the second set value under the conditions that the counter means is at the first set value and the reference position signal has been generated. The control means control the counter means so that when it is decided by the decision means that the count value of the counter means has changed from the first to the second set value prior to the generation of the reference position signal. The counter means is made to have the second set value at the time of generation of the reference position signal.
- Assignee:
- Fujitsu Ten, Ltd., Kobe
- Patent Number(s):
- US 4607523
- OSTI ID:
- 5166261
- Country of Publication:
- United States
- Language:
- English
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