Method and apparatus for optimum control for internal combustion engines
First Claim
1. A method for optimum control for internal combustion engines using memory means preliminarily storing, in the form of maps, values of ignition timing and air-fuel ratio as control variables of an internal combustion engine in accordance with parameters indicative of operating conditions of said engine and alternately performing an ignition timing optimizing control and an air-fuel ratio optimizing control, wherein:
- said ignition optimizing control executing at least one cycle of an ignition timing optimization processing comprising;
operating said engine, with the value of air-fuel ratio being maintained constant at a value stored in the map, at at least two ignition timings including one of said stored values of ignition timing for a predetermined time period,detecting signals indicative of one of engine rotational speed and engine output torque resulting from the operations of said engine at said at least two ignition timings, respectively,comparing with one another said detection signals resulting from the operations of said engine over at least three successive ones of said predetermined time periods among said detection signals resulting from the operations of said engine at said at least two ignition timings,deciding from the result of the comparison a direction of correction in which the rate of fuel consumption of saidengine is to be improved, andcorrecting in said direction said one of said stored values of ignition timing; and
said air-fuel ratio optimizing control executing at least one cycle of an air-fuel ratio optimization processing comprising;
operating said engine, with the value of ignition timing being maintained constant at a value stored in the map, at at least two air-fuel ratios including one of said stored values of air-fuel ratio for a predetermined time period,detecting signals indicative of one of engine rotational speed and engine output torque resulting from the operations of said engine at said at least two air-fuel ratios, respectively,comparing with one another said detection signals resulting from the operations of said engine over at least three successive ones of said predetermined time periods among said detection signals resulting from the operations of said engine at said at least two air-fuel ratios,deciding from the result of the comparison a direction of correction in which the rate of fuel consumption of said engine is to be improved, andcorrecting in said direction said one of said stored values of air-fuel ratio.
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Abstract
A method and apparatus for optimum control for internal combustion engines employ computing means with memory means in which the values indicative of ignition timings and air-fuel ratios of an engine are preliminarily stored in the form of maps in accordance with parameters indicative of the operating conditions of the engine. At least one cycle of ignition timing optimization processing and at least one cycle of air-fuel ratio optimization processing are performed alternately so as to control the engine at the optimum ignition timing and air-fuel ratio for minimum fuel consumption.
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Citations
8 Claims
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1. A method for optimum control for internal combustion engines using memory means preliminarily storing, in the form of maps, values of ignition timing and air-fuel ratio as control variables of an internal combustion engine in accordance with parameters indicative of operating conditions of said engine and alternately performing an ignition timing optimizing control and an air-fuel ratio optimizing control, wherein:
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said ignition optimizing control executing at least one cycle of an ignition timing optimization processing comprising; operating said engine, with the value of air-fuel ratio being maintained constant at a value stored in the map, at at least two ignition timings including one of said stored values of ignition timing for a predetermined time period, detecting signals indicative of one of engine rotational speed and engine output torque resulting from the operations of said engine at said at least two ignition timings, respectively, comparing with one another said detection signals resulting from the operations of said engine over at least three successive ones of said predetermined time periods among said detection signals resulting from the operations of said engine at said at least two ignition timings, deciding from the result of the comparison a direction of correction in which the rate of fuel consumption of saidengine is to be improved, and correcting in said direction said one of said stored values of ignition timing; and said air-fuel ratio optimizing control executing at least one cycle of an air-fuel ratio optimization processing comprising; operating said engine, with the value of ignition timing being maintained constant at a value stored in the map, at at least two air-fuel ratios including one of said stored values of air-fuel ratio for a predetermined time period, detecting signals indicative of one of engine rotational speed and engine output torque resulting from the operations of said engine at said at least two air-fuel ratios, respectively, comparing with one another said detection signals resulting from the operations of said engine over at least three successive ones of said predetermined time periods among said detection signals resulting from the operations of said engine at said at least two air-fuel ratios, deciding from the result of the comparison a direction of correction in which the rate of fuel consumption of said engine is to be improved, and correcting in said direction said one of said stored values of air-fuel ratio. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for optimum control for internal combustion engines for atlernately effecting optimizing controls of the ignition timing and air-fuel ratio as control variables of an internal combustion engine in response to signals generated by sensor means for sensing parameters indicative of operating conditions of said engine thereby to accomplish the optimum control of said engine, wherein:
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said sensor means include a rotational angle sensor for generating a signal indicative of a rotational angle of said engine, a pressure sensor for sensing pressure in an intake pipe of said engine, an air flow sensor for sensing an amount of air flow into said engine, and a throttle sensor for sensing an opening of a throttle valve of said engine; and said apparatus further comprises; an electromagnetic bypass air valve arranged to bypass said air flow sensor and said throttle valve which are disposed in an air intake system of said engine; and computing means having memory means preliminarily storing values of the ignition timing and air-fuel ratio of said engine and responsive to detection signals generated by said sensor means to effect computational operations and deliver output drive signals to ignition means, said electromagnetic bypass air valve and fuel injection valve means of said engine, thereby alternately effecting an operation of correcting, while maintaining the air-fuel ratio of said engine constant, a value of the ignition timing stored in said memory means in a direction to improve the rate of fuel consumption of said engine and an operation of correcting, while maintaining the ignition timing of said engine constant, a value of the air-fuel ratio stored in said memory means in a direction to improve the rate of fuel consumption of said engine. - View Dependent Claims (8)
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Specification