JP2006138228A5

JP2006138228A5 -

Info

Publication number: JP2006138228A5
Application number: JP2004327068A
Authority: JP
Filing date: 2004-11-10
Publication date: 2007-09-13
Anticipated expiration: 2024-11-10

Claims

A highly stable flow rate control system for controlling a variable displacement pump,
A metering valve in fluid communication with the variable displacement pump for metering pump discharge;
A regulating valve device for maintaining a differential pressure before and after the metering valve;
An actuator connected to the variable displacement pump for setting the discharge of the variable displacement pump,
The regulator valve device receives a portion of the pump discharge of the variable displacement pump as a bypass flow that maintains a first pressure, and the valve output from the regulator valve device is temporarily equal to the average of the first pressure and the low reference pressure. Maintaining pressure,
A highly stable flow rate control system in which the actuator receives a valve output and thus pump discharge to determine a setpoint value of the actuator.

The fuel metering unit according to claim 1, wherein the second pressure in the actuator exerts a pressure opposite to the temporary pressure.

The fuel metering unit of claim 1, wherein the second pressure is approximately equal to a temporary pressure during operation in a steady state.

The fuel metering unit of claim 1, further comprising a filter in fluid communication with the discharge side of the variable displacement pump to remove deposits.

2. The fuel metering unit according to claim 1, further comprising a first line connected between a metering output side of the metering valve and the control valve in order to moderate the response of the regulator valve device.

6. The fuel metering unit according to claim 5, wherein the first line is a static line.

The fuel metering unit according to claim 5, further comprising an orifice in the first line.

6. The fuel metering unit according to claim 5, further comprising a second line connected between the control valve device and the cam actuator for applying a temporary pressure to the cam actuator.

The fuel metering unit according to claim 1, wherein the actuator includes a piston connected to a movable cam ring of the variable displacement pump.

A fuel metering unit that controls a variable displacement pump that receives a fuel that maintains a low reference pressure and generates a high-pressure discharge.
First means in fluid communication with the variable displacement pump for metering the discharge of the variable displacement pump;
Second means in fluid communication with the first means for maintaining a constant differential pressure across the third means and generating a temporary pressure approximately equal to the average of the high pressure and the low reference pressure;
Third means operatively connected to the variable displacement pump for controlling the discharge rate of the variable displacement pump;
A fuel line connected between the discharge side of the variable displacement pump and the third means for applying an opposing pressure to the third means;
The fuel metering unit, wherein the set value of the third means is based on a differential pressure between the temporary pressure and the opposing pressure.

11. The fuel metering unit according to claim 10, wherein the fuel metering unit is connected to a low reference pressure so that a temporary pressure and an opposing pressure are equal while the fuel line operates in a steady state.

11. The fuel metering unit according to claim 10, wherein the first means is a metering valve.

The fuel metering unit according to claim 10, wherein the second means is a control valve.

11. The fuel metering unit according to claim 10, wherein the third means is a cam actuator.

11. The fuel metering unit of claim 10, further comprising a filter in fluid communication with the discharge side of the variable displacement pump to remove deposits.

11. The fuel metering unit according to claim 10, further comprising first means connected between the metering output side of the first means and the third means in order to make the response of the third means gentle.

The fuel metering unit according to claim 15, wherein the first means is a static line.

The fuel metering unit according to claim 15, further comprising an orifice in the first means.

11. The fuel metering unit according to claim 10, further comprising a second line connected between the third means and the second means in order to moderate the response of the second means.

A method of metering a variable displacement pump that supplies fuel to an engine, the step of receiving fuel that maintains a low reference pressure into the variable displacement pump;
Boosting the fuel with the variable displacement pump so that the discharge of the variable displacement pump becomes high pressure;
A process of measuring the discharge amount of the variable displacement pump with a metering valve;
Generating an effluent return flow from the discharge of the variable displacement pump to respond quickly when the engine requires additional fuel;
The process of adjusting the differential pressure before and after the metering valve using the control valve,
Adjusting the discharge amount of the variable displacement pump using a cam actuator connected to the cam ring of the variable displacement pump to adjust the discharge amount,
The regulator valve is in fluid communication with the outlet return flow rate so that the regulator valve generates a temporary pressure approximately equal to the average of the outlet return flow rate and the low reference pressure;
A method in which the cam actuator receives a temporary pressure to determine a setting value for the cam actuator.

21. The method of claim 20, further comprising the step of applying a second pressure to the cam actuator opposite the temporary pressure.

21. The method of claim 20, further comprising the step of slowing the response of the regulator valve by directing the metering output of the metering valve to the regulator valve.