Adjusting system for crank angle sensor

Claim 2

An adjusting system for internal combustion engines comprising: first means associated with an engine crankshaft for producing first and second pulse signals, said first signal being indicative of a predetermined crankshaft position for each engine cylinder and said second signal being indicative of rotation of the engine crankshaft through a predetermined unit angle; second means applied with said first and second signals from said first means for adjusting said first signal to provide a third pulse signal; and third means for measuring the difference between an actual value and a target value with respect to a desired timing, said actual value of the desired timing being variable corresponding to a change in a pulse phase of said third signal; said adjustment of the first signal being done to eliminate said difference between the actual and target values.

Claim 3

An adjusting system for internal combustion engines as set forth in claim 1, wherein said second means comprises: fourth means being manually operable for outputting a correction value to compensate for said difference between said actual and target values; and fifth means, being supplied with said first and second signals from the first means and said correction value from said fourth means, for adjusting said first signal in response to said correction value to provide said third signal.

Claim 4

An adjusting system for internal combustion engines as set forth in claim 1, wherein said second means comprising: a flip-flop for providing a high output in response to a pulse of the first signal from the first means applied thereto; an AND gate, receiving as inputs the second pulse signal from the first means and the output of the flip-flop, for providing a pulse only when its inputs are both high in level; a binary counter, starting to count the pulse applied from the AND gate in synchronism with the rising edge of the pulse of the first signal from the first means, for providing first, second, and third binary outputs, said first output changing its level each time the output of the AND gate goes high in level, the second output changing its level each time the first output goes low in level and the third output changing its level each time the second output goes low in level; a digital switch, being manually operable, for producing first, second, and third binary outputs, which form a binary word as a correction value to compensate for said difference between the actual and target values; a digital comparator receiving the three outputs of the binary counter and the three outputs of the digital switch, for comparing the first output of the binary counter with the first output of the digital switch, the second output of the binary counter with the second output of the digital switch and the third output of the binary counter with the third output of the digital switch, respectively, said digital switch providing a high output when each output of the binary counter is the same in level as the corresponding output of the digital switch; and a monostable multivibrator for providing a pulse in response to the high input from the digital comparator; said flip-flop being reset to generate a low output in response to the trailing edge of the pulse applied from the monostable multivibrator.

Claim 5

An adjusting system for internal combustion engines as set forth in claim 3, wherein said third means is directly supplied with said third signal from said second means to measure said difference by detecting a pulse phase of said third signal, said actual value of the desired timing being in synchronism with each pulse of said third signal.

Claim 6

An adjusting system for internal combustion engines as set forth in claim 4, wherein said desired timing is the predetermined crankshaft position for each engine cylinder.

Claim 7

An adjusting system for internal combustion engines as set forth in claim 2, wherein said fifth means is a digital computer which is further supplied with various inputs for determining the optimal fuel injection timing at that time and said adjustment of the first signal is performed during fixed engine operation.

Claim 8

An adjusting system for internal combustion engines as set forth in claim 6, wherein said fourth means is a variable resistor.

Claim 9

An adjusting system for internal combustion engines as set forth in any one of the claims 3, 4, 6 and 7, wherein said predetermined crankshaft position is the compression top dead center for each engine cylinder.

Claim 10

An adjusting system for internal combustion engines as set forth in claim 6 or 7, wherein said desired timing is fuel injection timing and said difference is measured by detecting an occurrence when fuel is injected into each engine cylinder, said actual value of the desired timing being in synchronism with said occurrence.

Claim 11

An adjusting system for an internal combustion engine having a crankshaft, said adjusting means comprising: a crank angle sensor associated with said crankshaft for producing a first pulse signal indicative of a predetermined crankshaft position; means responsive to said first pulse signal for producing a second pulse signal having a controlled phase relation with respect to said first pulse signal; means associated with said second pulse signal producing means for adjusting the phase relation of said second pulse signal with respect to said first pulse signal to vary the timing of said second pulse signal; and means responsive to said second pulse signal for controlling the timing of an engine operation; whereas the timing of said engine operation may be controllably adjusted to a target value while the timing of said first pulse signal remains constant.

Claim 12

An adjusting system for an internal combustion engine having a crankshaft, said adjusting means comprising: a crank angle sensor associated with said crankshaft for producing a first pulse signal indicative of a predetermined crankshaft position; means responsive to said first pulse signal for producing a second pulse signal having a controlled phase relation with respect to said first pulse signal; means associated with said second pulse signal producing means for adjusting the phase relation of said second pulse signal with respect to said first pulse signal to vary the timing of said second pulse signal; and means responsive to said second pulse signal for controlling the timing of an engine operation; whereas the timing of said engine operation may be controllably adjusted to a target value while the timing of said first pulse signal remains constant.

Claim 13

An adjusting system as set forth in claim 10 further comprising means responsive to said second pulse signal for comparing the timing of said second pulse signal to a desired target value.

Claim 14

An adjusting system as set forth in claim 11 wherein said comparing means comprises a strobe light energized synchronously with said second pulse signal.

Claim 15

An adjusting system as set forth in claim 10 wherein said phase relation adjusting means comprises means for outputting a correction signal having a desired value to said second pulse signal producing means, and means for adjusting the phase relation of said second pulse signal in response to said correction signal.

Claim 16

An adjusting system as set forth in claim 13 wherein said correction signal outputting means is manually adjustable to vary the value of said correction signal.

Claim 17

An adjusting system as set forth in claim 14 wherein said correction signal outputting means comprises a binary switch.

Claim 18

An adjusting system as set forth in claim 14 wherein said correction signal outputting means comprises a variable resistor.

Claim 19

An adjusting system as set forth in claim 10 wherein the timing of said engine operation is synchronized with the timing of said second pulse signal.

Claim 20

An adjusting system as set forth in claim 10 wherein said engine operation is spark ignition.

Claim 21

An adjusting system as set forth in claim 10 wherein said engine operation is fuel injection.