Apparatus for determining the value of a cyclically varying parameter of an internal combustion engine
First Claim
1. Apparatus for determing the average value of a parameter having a periodically or cyclically varying parameter component in a piston-type internal combustion engine (ICE) operating in cycles havingsensing means (12) for sensing an operating parameter of the engine and providin a varying sensed output signal representative of the cyclically varying parameter;
- an output circuit (16);
means (14) for providing a reading signal;
and controlled switch means (13) controlled by said reading signal selectively connecting the sensing means (12) to the output circuit (16),wherein, in accordance with the invention,the means (14) for providing the reading signal is coupled to the crankshaft of the engine for providing, at each cycle of operation of the engine, a single reading signal,said signal providing means (14) furnishing said signal at a predetermined angular positon of the crankshaft of the engine with respect to a reference (TDC) position of a reference piston of the engine;
and the output circuit (16) provides an output signal representative of the value of the time-average of the sensed signals and is coupled to the signal providing means (14).
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Abstract
To permit simple computation of control parameters, for example by an engine microcomputer, operating parameters of the engine are signalled by sensing instantaneous operating conditions such as speed, induction air pressure, or the like, preferably at a sensing angle of the crankshaft in advance of top dead center (TDC) position of a reference piston, and the average value is then determined by weighting the sensed instantaneous value to relate it to an average value in a weighting circuit (16). Preferably, the sensed signal is additionally modified in a function generator (15) as a function of then pertaining average conditions of at least one of: speed n; loading L.
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Citations
19 Claims
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1. Apparatus for determing the average value of a parameter having a periodically or cyclically varying parameter component in a piston-type internal combustion engine (ICE) operating in cycles having
sensing means (12) for sensing an operating parameter of the engine and providin a varying sensed output signal representative of the cyclically varying parameter; -
an output circuit (16); means (14) for providing a reading signal; and controlled switch means (13) controlled by said reading signal selectively connecting the sensing means (12) to the output circuit (16), wherein, in accordance with the invention, the means (14) for providing the reading signal is coupled to the crankshaft of the engine for providing, at each cycle of operation of the engine, a single reading signal, said signal providing means (14) furnishing said signal at a predetermined angular positon of the crankshaft of the engine with respect to a reference (TDC) position of a reference piston of the engine; and the output circuit (16) provides an output signal representative of the value of the time-average of the sensed signals and is coupled to the signal providing means (14). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Method of deriving a signal representative of an average value of an operating parameter of a piston-type internal combustion engine (ICE), which parameter includes a cyclically varying component, comprising the steps of
determining the value of the signal with respect to the time when the cyclically varying component goes through zero.
Specification