IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0974757
(2004-10-28)
|
우선권정보 |
JP-0374733 (2003-11-04) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
4 |
초록
▼
When a learning condition is satisfied, control device performs a feedback control. In the feedback control, a metering valve control value is progressively increased to progressively increase a degree of opening of an inlet metering valve, and a pressure of a common rail is kept constant. When the
When a learning condition is satisfied, control device performs a feedback control. In the feedback control, a metering valve control value is progressively increased to progressively increase a degree of opening of an inlet metering valve, and a pressure of a common rail is kept constant. When the amount of change in a pressure-reducing valve control value becomes equal to or less than a predetermined value, a current metering valve control value, which is currently supplied to the inlet metering valve, is obtained as a maximum discharge rate control value. Also, an intake initiation control value, at which a high pressure pump begins intake of fuel, is obtained. Then, based on these values, a pump characteristic is obtained. Thereafter, the control device obtains the metering valve control value based on a computed degree of opening of the inlet metering valve and the pump characteristic.
대표청구항
▼
1. A valve opening degree control system comprising:a fluid drive means for drawing or pumping fluid;a valve that adjusts a degree of opening of a fluid passage, which conducts the fluid drawn or pumped by the fluid drive means, wherein a maximum adjusting performance of the valve is larger than a m
1. A valve opening degree control system comprising:a fluid drive means for drawing or pumping fluid;a valve that adjusts a degree of opening of a fluid passage, which conducts the fluid drawn or pumped by the fluid drive means, wherein a maximum adjusting performance of the valve is larger than a maximum performance of the fluid drive means;a control device that controls a degree of opening of the valve; anda flow rate change sensing means for sensing an amount of change in the flow rate of the fluid, which is conducted through the fluid passage, wherein:the control device includes a learning means;the learning means controls a valve control value, which is supplied to the valve to control the degree of opening of the valve;the learning means controls the valve control value in a manner that achieves one of:progressively increasing of the degree of opening of the valve from a first preset value, which is smaller than a maximum performance implementing threshold value that implements the maximum performance of the fluid drive means; andprogressively reducing of the degree of opening of the valve from a second preset value, which is larger than the maximum performance implementing threshold value that implements the maximum performance of the fluid drive means;at the time of progressively increasing the degree of opening of the valve from the first preset value, when the amount of change in the flow rate of the fluid in the fluid passage, which is sensed by the flow rate change sensing means, becomes equal to or less than a corresponding predetermined value, the learning means obtains the current valve control value, which is currently supplied to the valve, as a maximum control value;at the time of progressively decreasing the degree of opening of the valve from the second preset value, when the amount of change in the flow rate of the fluid in the fluid passage, which is sensed by the flow rate change sensing means, becomes equal to or greater than a corresponding predetermined value, the learning means obtains the current valve control value, which is currently supplied to the valve, as the maximum control value; andthe learning means learns that the fluid drive means attains the maximum performance at the maximum control value.2. A common rail type fuel injection system comprising:a common rail that accumulates high pressure fuel;an injector that injects the high pressure fuel accumulated in the common rail;a high pressure pump that includes a compression chamber, which draws and pressurizes fuel, wherein the high pressure pump feeds the pressurized fuel to the common rail;an inlet metering valve that adjusts a degree of opening of a feed passage, which conducts fuel to the high pressure pump, to adjust a discharge rate of the high pressure pump, wherein a maximum feed rate of fuel, which is fed from the inlet metering valve to the high pressure pump, is greater than a maximum discharge rate of the high pressure pump;a control device that controls at least a degree of opening of the inlet metering valve; anda discharge rate change sensing means for sensing an amount of change in the discharge rate of the high pressure pump, wherein:the control device includes a learning means;the learning means controls a metering valve control value, which is supplied to the inlet metering valve to control the degree of opening of the inlet metering valve;the learning means controls the metering valve control value in a manner that progressively increases the degree of opening of the inlet metering valve from a preset value, which is smaller than a maximum discharge rate implementing threshold value that implements the maximum discharge rate of the high pressure pump;at the time of progressively increasing the degree of opening of the inlet metering valve, when the amount of change in the discharge rate of the high pressure pump, which is sensed by the discharge rate change sensing means, becomes equal to or less than a predetermined value, the learning means obtains the current metering valve control value, which is currently supplied to the inlet metering valve, as a maximum discharge rate control value; andthe learning means learns that the high pressure pump attains the maximum discharge rate at the maximum discharge rate control value.3. The common rail type fuel injection system according to claim 2, wherein:the learning means obtains a pump characteristic of the high pressure pump, which causes achievement of the maximum discharge rate of the high pressure pump at the maximum discharge rate control value; andthe learning means determines the metering valve control value, which is supplied to the inlet metering valve, based on the pump characteristic.4. The common rail type fuel injection system according to claim 3, wherein:the learning means controls the metering valve control value supplied to the inlet metering valve to progressively increase the degree of opening of the inlet metering valve from a prefixed value, which guarantees a zero intake rate of the inlet metering valve;at the time of increasing the degree of opening of the inlet metering valve from the value, which guarantees the zero intake rate of the inlet metering valve, when an amount of change in a pressure of the common rail becomes equal to or greater than a predetermined value, the learning means obtains the current metering valve control value, which is currently supplied to the intake metering valve, as an intake initiation control value;the learning means obtains the pump characteristic of the high pressure pump, which causes achievement of the maximum discharge rate of the high pressure pump at the maximum discharge rate control value, and which also causes initiation of intake of fuel by the high pressure pump at the intake initiation control value; andthe learning means determines the metering valve control value, which is supplied to the inlet metering valve, based on the pump characteristic.5. The common rail type fuel injection system according to claim 2, further comprising:a rail pressure sensor that senses the pressure of fuel accumulated in the common rail; anda pressure-reducing valve that adjusts a degree of opening of a drain passage, through which the fuel accumulated in the common rail is drained, wherein:the control device also controls a degree of opening of the pressure-reducing valve;the discharge rate change sensing means senses the amount of change in the discharge rate of the high pressure pump based on at least one of:an amount of change in the pressure sensed by the rail pressure sensor; anda pressure-reducing valve control value, which is supplied from the control device to the pressure-reducing valve to maintain a constant pressure in the common rail by the pressure-reducing valve.6. The common rail type fuel injection system according to claim 5, wherein:the learning means increases the degree of opening of the inlet metering valve by a predetermined amount; andwhen the amount of change in the discharge rate of the high pressure pump is increased to a value, which corresponds to the increased degree of opening of the inlet metering valve, the learning means repeats the increasing of the degree of opening of the inlet metering valve by the predetermined amount to sense a time point, at which the amount of change in the discharge rate of the high pressure pump becomes equal to or less than a predetermined value.7. The common rail type fuel injection system according to claim 2, wherein when a predetermined learning condition is satisfied, the learning means progressively increases the degree of opening of the inlet metering valve from the preset value, which is smaller than and close to the maximum discharge rate implementing threshold value that implements the maximum discharge rate of the high pressure pump.8. The common rail type fuel injection system according to claim 2, wherein the inlet metering valve is of an opening cross sectional area variable type, which adjusts a passage opening cross sectional area in the feed passage, which conducts the fuel to the high pressure pump.9. A common rail type fuel injection system comprising:a common rail that accumulates high pressure fuel;an injector that injects the high pressure fuel accumulated in the common rail;a high pressure pump that includes a compression chamber, which draws and pressurizes fuel, wherein the high pressure pump feeds the pressurized fuel to the common rail;an inlet metering valve that adjusts a degree of opening of a feed passage, which conducts fuel to the high pressure pump;a pressure-reducing valve that adjusts a degree of opening of a drain passage, through which the fuel accumulated in the common rail is drained, wherein a maximum draining rate of the pressure-reducing valve for draining the fuel accumulated in the common rail is greater than a maximum feed rate of fuel, which is fed from the high pressure pump to the common rail;a control device that controls at least a degree of opening of the inlet metering valve and a degree of opening of the pressure-reducing valve; anda feed rate change sensing means for sensing an amount of change in the feed rate of fuel, which is fed from the high pressure pump to the common rail, wherein:the control device includes a learning means;the learning means controls a pressure-reducing valve control value, which is supplied to the pressure-reducing valve to control the degree of opening of the pressure-reducing valve, wherein the learning means controls the pressure-reducing valve control value in a manner that progressively increases the degree of opening of the pressure-reducing valve from a preset value, which is smaller than a maximum feed rate implementing threshold value that implements the maximum feed rate of the fuel, which is fed from the high pressure pump to the common rail;the learning means also controls a metering valve control value, which is supplied to the inlet metering valve to control the degree of opening of the inlet metering valve, wherein the learning means controls the metering valve control value in a manner that maintains a constant pressure in the common rail at the time of controlling the pressure-reducing valve control value;at the time of progressively increasing the degree of opening of the pressure-reducing valve, when the amount of change in the feed rate of the fuel, which is fed from the high pressure pump to the common rail, becomes equal to or less than a predetermined value, the learning means obtains the current pressure-reducing valve control value, which is currently supplied to the pressure-reducing valve, as a maximum draining rate control value; andthe learning means learns that the pressure-reducing valve attains the maximum draining rate at the maximum draining rate control value.
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