Electronic fuel injection control method and apparatus for a fuel injection type internal combustion engine
First Claim
1. A fuel injection quantity control method for an internal combustion engine with a fuel injection valve, and an actuator controlling the quantity of fuel supplied to the fuel injection valve in response to a control signal comprising the steps of:
- (a) sensing a plurality of engine operating parameters including engine speed;
(b) calculating a desired fuel injection valve opening interval on the basis of the sensed engine operating parameters;
(c) sensing an opening interval of said fuel injection valve;
(d) comparing the desired and actual opening intervals of the valve to derive a difference; and
(e) adjusting the control signal to the actuator in accordance with the difference,whereby the actuator is controlled so as to adjust the quantity of injected fuel, corresponding on the basis of the sensed engine parameters to the injection valve opening interval, to more nearly equal a desired fuel injection quantity corresponding to the desired fuel injection valve opening interval.
1 Assignment
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Accused Products
Abstract
An electronic fuel injection control method and apparatus employs sensors which sense engine speed and the opening interval of a fuel injection valve to provide a measure of the actual fuel quantity injected thereby. The actual opening interval of the valve is compared to the calculated desired opening interval of the valve to derive a difference value. The supply of fuel to the injection valve is determined by the position of a control sleeve controlled in turn by a command signal-responsive actuator. The difference value is used to adjust the command signal by an amount dependent on the sign and magnitude of the difference value in order to minimize the subsequent difference value.
27 Citations
20 Claims
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1. A fuel injection quantity control method for an internal combustion engine with a fuel injection valve, and an actuator controlling the quantity of fuel supplied to the fuel injection valve in response to a control signal comprising the steps of:
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(a) sensing a plurality of engine operating parameters including engine speed; (b) calculating a desired fuel injection valve opening interval on the basis of the sensed engine operating parameters; (c) sensing an opening interval of said fuel injection valve; (d) comparing the desired and actual opening intervals of the valve to derive a difference; and (e) adjusting the control signal to the actuator in accordance with the difference, whereby the actuator is controlled so as to adjust the quantity of injected fuel, corresponding on the basis of the sensed engine parameters to the injection valve opening interval, to more nearly equal a desired fuel injection quantity corresponding to the desired fuel injection valve opening interval. - View Dependent Claims (3)
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2. A fuel injection quantity control method for an internal combustion engine with a fuel injection valve, and an actuator controlling the quantity of fuel supplied to the fuel injection valve in response to a control signal, comprising the steps of:
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(a) sensing a plurality of engine operating parameters including engine speed; (b) calculating a desired fuel injection valve opening interval corresponding to a desired fuel injection quantity on the basis of the sensed engine operating parameters; (c) sensing an actual opening interval of said fuel injection valve; (d) comparing the desired and actual opening intervals of the valve to derive a difference; (e) comparing the difference between the actual and desired opening intervals of the valve to a plurality of quantitative ranges to determine which of the ranges includes the difference; and (f) adding to the control signal a predetermined control signal adjustment value associated with the range within which the difference falls. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A fuel injection quantity control apparatus for an internal combustion engine with a fuel injection valve and a device determining the quantity of fuel supplied to the fuel injection valve, comprising:
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(a) an actuator responsive to a control signal for controlling an operating condition of the fuel quantity-determining device; (b) a first sensor for producing a first sensor signal indicative of the opening interval of the fuel injection valve; (c) a plurality of other sensors for producing auxiliary sensor signals including engine speed, said signals indicative of other engine operating conditions; (d) controlling means receiving the sensor signals and having a calculating means for calculating the desired fuel injection valve opening interval on the basis of the auxiliary sensor signals, comparing the desired and actual opening intervals of the valve to derive a difference quantity, and producing the control signal to the actuator in accordance with the difference quantity, whereby the actual of injected fuel, corresponding to the injection valve opening interval, is caused to more nearly equal a desired quantity of injected fuel, corresponding on the basis of the auxiliary sensor signals to the desired fuel injection valve opening interval. - View Dependent Claims (12, 13, 14, 15)
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16. A fuel injection quantity control apparatus for an internal combustion engine with a fuel injection valve and a device determining the quantity of fuel supplied to the fuel injection valve, comprising:
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(a) an actuator responsive to a control signal for controlling the operating condition of the fuel quantity-determining device; (b) a first sensor for producing a first sensor signal indicative of the opening interval of the fuel injection valve; (c) a plurality of other sensors for producing auxiliary sensor signals including engine speed, said signals indicative of other engine operating conditions; (d) a controller receiving the sensor signals and having a calculating unit for calculating the desired fuel injection valve opening interval corresponding to a desired fuel injection quantity on the basis of the auxiliary sensor signals, comparing the desired and actual opening intervals of the valve to derive a difference quantity, comparing the difference between the actual and desired opening intervals of the valve to a plurality of quantitative ranges to determine which of the ranges includes the difference, and adding to the control signal a predetermined control signal adjustment value associated with the range within which the difference falls. - View Dependent Claims (17, 18, 19, 20)
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Specification