Method for determining the control values of a multicylinder internal combustion engine and apparatus therefor
First Claim
1. A method for determining controlled variables of each cylinder in a control system of a multicylinder internal combustion engine wherein the control variables are determined independently for each cylinder according to data representing the operating condition of the engine, while said data is being detected at predetermined timing, said method comprising the steps of:
- detecting data representing the condition of the engine, including at least intake air quantity and engine speed;
storing said data in memory means;
detecting that said engine has been accelerated when a throttle valve opening variation per unit time of said engine exceeds a predetermined value;
determining as a first controlled variable a basic fuel flow rate at which the fuel is supplied to the cylinders of said engine at a certain time of a certain stroke of each said cylinder according to the data in said memory means;
determining as a second controlled variable the ignition timing of each cylinder at a time after said certain time in said stroke according to the same data of said memory means;
determining an acceleration increment of the fuel flow in response to detection of said acceleration by determining an increment of supplied fuel according to the value of said throttle valve opening variation; and
determining a first correction value for the ignition timing according to the increment of said supplied fuel.
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Abstract
With regard to the engine control method which determines control variables for the individual cylinders of a multicylinder internal combustion engine independently of one another, this specification discloses improved control method and apparatus whereby the optimum control variables are determined. The control method of a multicylinder internal combustion engine according to this invention includes a step of detecting data representing the operating condition of the engine, a step of storing data, a step of determining a first control variable at a certain time of a certain stroke of each cylinder according to the stored data, and a step of determining a second control variable at a later time in the stroke according to the same stored data. A control apparatus of a multicylinder internal combustion engine according to this invention includes a device for detecting data representing the operating condition of the engine, a memory device for storing data, a device for calculating a first controlled variable at a certain time of a certain stroke of each cylinder according to data in the memory device, and a device for determining a second controlled variable at a later time in said stroke according to the same data in said memory device.
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Citations
5 Claims
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1. A method for determining controlled variables of each cylinder in a control system of a multicylinder internal combustion engine wherein the control variables are determined independently for each cylinder according to data representing the operating condition of the engine, while said data is being detected at predetermined timing, said method comprising the steps of:
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detecting data representing the condition of the engine, including at least intake air quantity and engine speed; storing said data in memory means; detecting that said engine has been accelerated when a throttle valve opening variation per unit time of said engine exceeds a predetermined value; determining as a first controlled variable a basic fuel flow rate at which the fuel is supplied to the cylinders of said engine at a certain time of a certain stroke of each said cylinder according to the data in said memory means; determining as a second controlled variable the ignition timing of each cylinder at a time after said certain time in said stroke according to the same data of said memory means; determining an acceleration increment of the fuel flow in response to detection of said acceleration by determining an increment of supplied fuel according to the value of said throttle valve opening variation; and determining a first correction value for the ignition timing according to the increment of said supplied fuel. - View Dependent Claims (2, 3, 4, 5)
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Specification