High-pressure fuel injection system
First Claim
1. A high-pressure fuel injection system, comprising:
- a fuel injection unit including an injector;
a fuel pump for supplying a high-pressure fuel to said fuel injection unit;
a motor for driving said fuel pump;
a PID controller for controlling operation of said motor;
means for measuring actual fuel pressure in said fuel injection unit;
means for calculating deviation of said actual fuel pressure from a predetermined desired fuel pressure and for inputting said deviation to said PID controller as an actuating signal;
means for calculating a desired fuel injection quantity per injection from input signals indicating engine speed and accelerator opening;
means for calculating an injection quantity per unit time on the basis of said desired injection quantity; and
means for correcting gain factors of said PID controller on the basis of said calculated per-unit time injection quantity.
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Accused Products
Abstract
A high-pressure fuel injection system which has a fuel injection unit including an injector, a fuel pump for supplying a high-pressure fuel to the fuel injection unit, a motor for driving the fuel pump, a PID controller for controlling the operation of the motor, a device for measuring an actual fuel pressure in the fuel injection unit, a device for calculating a deviation of the actual fuel pressure from a predetermined desired fuel pressure and for inputting the deviation to the PID controller as an actuating signal, and a device for calculating a desired fuel injection quantity per injection from input signals indicating an engine speed, an accelerator opening, etc. A manipulated variable which is given as an output from the PID controller is supplied to the motor as an input to control the motor. The system further has a device for calculating an injection quantity per unit time on the basis of the desired injection quantity, and a motor input correcting device which corrects the PID controller itself or the output from it so that the input to be supplied to the motor from the PID controller is corrected on the basis of the calculated per-unit time injection quantity.
44 Citations
17 Claims
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1. A high-pressure fuel injection system, comprising:
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a fuel injection unit including an injector; a fuel pump for supplying a high-pressure fuel to said fuel injection unit; a motor for driving said fuel pump; a PID controller for controlling operation of said motor; means for measuring actual fuel pressure in said fuel injection unit; means for calculating deviation of said actual fuel pressure from a predetermined desired fuel pressure and for inputting said deviation to said PID controller as an actuating signal; means for calculating a desired fuel injection quantity per injection from input signals indicating engine speed and accelerator opening; means for calculating an injection quantity per unit time on the basis of said desired injection quantity; and means for correcting gain factors of said PID controller on the basis of said calculated per-unit time injection quantity. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17)
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2. A high-pressure fuel injection system, comprising:
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a fuel injection unit including an injector; a fuel pump for supplying a high-pressure fuel to said fuel injection unit; a motor for driving said fuel pump; a PID controller for controlling operation of said motor; means for measuring actual fuel pressure in said fuel injection unit; means for calculating deviation of said actual fuel pressure from a predetermined desired fuel pressure and for inputting said deviation to said PID controller as an actuating signal; means for calculating a desired fuel injection quantity per injection from input signals indicating engine speed, and accelerator opening; means for calculating an injection quantity per unit time on the basis of said desired injection quantity; and means for correcting output delivered from said PID controller to said motor by calculating a correction quantity on the basis of said calculated per unit-time injection quantity and adding said correction quantity to the output from the PID controller. - View Dependent Claims (12, 13)
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3. A method of injecting high-pressure fuel where a fuel pump is driven by a motor to supply fuel placed under high pressure to an injector so that a desired amount of fuel placed high pressure is injected from the injector, comprising:
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calculating a desired fuel injection quantity per injection based on signals indicating engine speed and accelerator opening; measuring actual fuel pressure injected from the injector; calculating deviation of said actual fuel pressure from a predetermined desired fuel pressure and inputting said deviation as an actuating signal to a PID controller for controlling an operation of said motor; calculating an injection quantity per unit time on the basis of said desired injection quantity; and correcting gain factors of said PID controller on the basis of said calculated per-unit time injection quantity.
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4. A method of injecting high-pressure fuel where a fuel pump is driven by a motor to supply fuel placed under high pressure to an injector so that a desired amount of fuel placed high pressure is injected from the injector, comprising:
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calculating a desired fuel injection quantity per injection based on signals indicating engine speed, and accelerator opening; measuring actual fuel pressure injected from the injector; calculating deviation of said actual fuel pressure from a predetermined desired fuel pressure and inputting said deviation as an actuating signal to a PID controller for controlling an operation of said motor; calculating an injection quantity per unit time on the basis of said desired injection quantity; and correcting said output outputted from said PID controller to said motor by adding a correction quantity calculated on the basis of said calculated per-unit time injection quantity.
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Specification