Method and system for engine control

An engine control system wherein an engine control signal is produced on the basis of data representative of a signal detected from at least one sensor for detecting an operating condition of an engine being operated said system comprising:

• (a) means for adjusting data representative of a detection signal of said at least one sensor in a manner to attain the proper operating condition of the engine;
• (b) a memory for storing correction data corresponding to a correction value of said data representative of the detection signal in response to said adjusting means;
• (c) means for producing said engine control signal on the basis of data representative of a detection signal from said at least one sensor and said correction data stored in said memory;
• and
• (d) means for controlling the operation of said engine on the basis of the control signal produced from said control signal generating means.

A method of operating a processor-controlled engine in which processor-derived control signals are produced in response to output signals from at least one sensor means for detecting at least one operation condition of the engine comprising the steps of:

• (a) obtaining a reference value in response to an output signal of a sensor means for detecting a preselected operational condition of the engine for a prescribed state of operation of the engine, which reference value is representative of the amount by which the value of the output signal of said sensor means is to be modified in order to attain the proper operating condition of the engine;
• (b) storing, in memory, a correction value corresponding to said reference value, in dependence upon which processor-derived control signals are produced;
• (c) for a predetermined operational state of said engine, modifying a value representative of an output signal of the sensor means for detecting said preselected operational condition of the engine using said correction value stored in memory;
• and
• (d) producing an engine control signal on the basis of the modified output signal value obtained in step (c).

In a method of controlling an engine in which an engine control signal is generated on the basis of a signal detected from at least one sensor for detecting an engine operating condition while the engine is being operated, the improvement comprising the steps of;

• during a first prescribed condition of the engine,
• (a) measuring the output of said at least one sensor and generating therefrom correction data for correcting data representative of a detection signal produced by said at least one sensor during said operating condition of the engine and storing said correction data;
• during said operating condition of the engine,
• (b) generating output data representative of the output of said at least one sensor;
• (c) modifying said output data in accordance with said stored correction data;
• (d) producing said engine control signal on the basis of said modified output data;
• and
• (e) controlling said operating condition of the engine in accordance with said control signal.

A method of operating a processor-controlled engine in which processor-derived control signals are produced in response to output signals from at least one sensor means for detecting at least one operational condition of the engine said at least one sensor means comprising means for detecting the rotational position of the engine crankshaft relative to a preselected location, and wherein said prescribed state of operation of the engine correspondence to the idling state of the engine, comprising the steps of:

• (a) obtaining a reference value in response to an output signal of a sensor means for detecting a preselected operational condition of the engine for a prescribed state of operation of the engine;
• and
• (b) storing, in memory, said reference value, in dependence upon which processor-derived control signals are produced;
• and wherein (a) comprises the steps of;
• (a1) producing an output signal of the sensor means for detecting a preselected operational condition of the engine for said prescribed state of operation of the engine;
• and
• (a2) detecting the amount by which the value of the output signal of the sensor means is to be modified in order to cause the ignition advance angle to have a prescribed value;
• and
• wherein step (b) comprises the step of storing, as said reference value, a value corresponding to the amount detected in step (a2).