METHOD OF AND DEVICE FOR CONTROLLING PRESSURE IN ACCUMULATION CHAMBER OF ACCUMULATION FUEL INJECTION APPARATUS
First Claim
1. A method of controlling an accumulation chamber pressure in an accumulator fuel injection apparatus, which comprises an accumulation chamber for storing a fuel under pressure, a fuel injection nozzle for injecting the fuel in the accumulation chamber into an internal combustion engine, and a fuel pump for pumping the fuel to the accumulation chamber, an accumulator fuel injection apparatus controlling a pump discharge amount of the fuel pump to bring a fuel pressure prevailing in the accumulation chamber to a target pressure,wherein the method comprises the steps of:
- calculating a pump discharge command value of the fuel pump by using feedback, based on a pressure difference between an actual accumulation chamber pressure detected by a fuel pressure sensor and the target pressure of the accumulation chamber;
producing a numerical model of the pump discharge command value of the fuel pump, a disturbance pressure acting on the accumulation chamber, and accumulation chamber pressure using a transfer function of the fuel pump;
estimating a pressure of the disturbance from the numerical model;
deriving a compensation value to compensate for the disturbance by using a disturbance observer; and
correcting an output calculated by the feedback with the disturbance compensation value derived by the disturbance observer.
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Accused Products
Abstract
A method of and a device for controlling a pressure is provided in which control performance of accumulation chamber pressure is not deteriorated even in the presence of a disturbance by estimating, with observer control, a disturbance pressure that acts on an accumulation chamber (common rail) constituting an accumulator fuel injection apparatus adapted for use in a diesel engine and the like, and by correcting a pump discharge command with a compensation value capable of compensating for the estimated disturbance pressure.
Provision of a feedback control unit 42 capable of calculating a pump discharge command value of a fuel pump based on a pressure difference between an actual accumulation chamber pressure detected by a fuel pressure sensor 46 and a target pressure of an accumulation chamber and a disturbance observer control unit 44 capable of deriving a compensation value compensating the disturbance by the numerical model of the pump discharge command value to the fuel pump, the disturbance pressure acting on the accumulation chamber, and an accumulation chamber pressure by using a transfer function of the fuel pump and by estimating the disturbance pressure from the numerical model, and an output from the feedback control unit 42 is corrected with the disturbance compensation value from the disturbance observer control unit 44.
40 Citations
8 Claims
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1. A method of controlling an accumulation chamber pressure in an accumulator fuel injection apparatus, which comprises an accumulation chamber for storing a fuel under pressure, a fuel injection nozzle for injecting the fuel in the accumulation chamber into an internal combustion engine, and a fuel pump for pumping the fuel to the accumulation chamber, an accumulator fuel injection apparatus controlling a pump discharge amount of the fuel pump to bring a fuel pressure prevailing in the accumulation chamber to a target pressure,
wherein the method comprises the steps of: -
calculating a pump discharge command value of the fuel pump by using feedback, based on a pressure difference between an actual accumulation chamber pressure detected by a fuel pressure sensor and the target pressure of the accumulation chamber; producing a numerical model of the pump discharge command value of the fuel pump, a disturbance pressure acting on the accumulation chamber, and accumulation chamber pressure using a transfer function of the fuel pump; estimating a pressure of the disturbance from the numerical model; deriving a compensation value to compensate for the disturbance by using a disturbance observer; and correcting an output calculated by the feedback with the disturbance compensation value derived by the disturbance observer. - View Dependent Claims (2, 3, 7)
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4. A device for controlling an accumulation chamber pressure in an accumulator fuel injection apparatus, which includes an accumulation chamber for storing a fuel under pressure;
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a fuel injection nozzle for injecting the fuel in the accumulation chamber into an internal combustion engine;
a fuel pump for pumping the fuel to the accumulation chamber; and
control means for controlling a pump discharge amount of the fuel pump to bring a fuel pressure prevailing in the accumulation chamber to a target pressure,wherein the control means comprises;
a feedback control unit configured to calculate a pump discharge command value of the fuel pump by using feedback, based on a pressure difference between an actual accumulation chamber pressure detected by a fuel pressure sensor and a target pressure in the accumulation chamber; and
a disturbance observer control unit configured to generate a numerical model of the pump discharge command value of the fuel pump, a disturbance pressure acting on the accumulation chamber, and an accumulation chamber pressure by using a transfer function of the fuel pump, to estimate a disturbance pressure from the numerical model, and to derive a compensation value capable of compensating for the disturbance, andwherein an output from the feedback control unit is corrected with the compensation value of the disturbance, which comes from the disturbance observer control unit. - View Dependent Claims (5, 6, 8)
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Specification