Method of detecting cylinder pressure in internal combustion engine
A method of detecting cylinder pressure angle in internal combustion engine, including the steps of: (a) determining first and second reference values such that the first reference value is higher than the second reference value and the first reference value is lower in voltage than a potential largest output signal expected to be output from a cylinder pressure sensor; (b) applying the first and second reference values and an output signal from the cylinder pressure sensor to a window comparator; (c) measuring distances from a predetermined point to leading and trailing edges of first and second pulses generated from the window comparator, respectively; (d) determining a first midpoint of the distance between the leading edge of the first pulse and the trailing edge of the second pulse and determining a second midpoint of the distance between the trailing edge of the first pulse and the leading edge of the second pulse of the window comparator; (e) approximating a point of maximum pressure by determining an angle of slope between the first and second midpoints and applying the angle of slope to the pressure output signal to determine a largest value of the pressure sensor, representing a maximum cylinder pressure, of a current cycle.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4800500
- OSTI ID:
- 6268838
- Resource Relation:
- Patent File Date: Filed date 2 Dec 1986
- Country of Publication:
- United States
- Language:
- English
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