Measuring and testing – Vehicle chassis – Steering
Patent
1996-07-03
1998-11-10
Dombroske, George M.
Measuring and testing
Vehicle chassis
Steering
123419, 73 3506, G01M 1500
Patent
active
058346368
ABSTRACT:
The object of the invention is to provide a low-priced engine control apparatus having a single CPU configuration which can be used for knocking detection and engine control as well, including: an A/D conversion unit which samples, at a predetermined cycle, analog signals of knocking detected and output from a knock sensor; an A/D converter for converting a sampled analog signal to a digital signal in a predetermined conversion time per A/D conversion; a frequency analysis unit which analyzes digital signals upon A/D conversion; a knocking judgment unit which judges the presence of knocking on the basis of a result of the frequency analysis; and a CPU which includes an ignition timing arithmetic unit which executes arithmetic calculation for controlling ignition timing corresponding to knocking on the basis of the judgment so as to ensure an optimum engine control in response to knocking. The predetermined cycle in A/D conversion unit is defined by a period of time which allows for the A/D converter to execute A/D conversion N times, with N being an integer greater than or equal to 2.
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Sasaki Shoji
Watabe Mitsuru
Dombroske George M.
Hitachi , Ltd.
McCall Eric S.
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