Disclosed are a high pressure fuel pump and a liquid petroleum direct injection system including the same. The high pressure fuel pump includes a body having an intake port and an exhaust port, and provided therein with a pressing device configured to press a portion of fuel at a high pressure, a spill valve coupled to one side of the body to control a supply flow rate and exhaust pressure of the fuel, and a cover coupled to an upper portion of the body and having a recovery port for recovering a portion of the fuel to a bombe. The cover has a dome shape that is convex upward. The cover collects gaseous fuel generated by heat of an engine when the engine is turned off after driving, that is, collects vapor to recover the vapor to the bombe, thereby improving the restartability.

Disclosed is a method of alerting to the state of a high-pressure pump of an engine including a relief valve, a threshold pressure defining the opening pressure of the relief valve, the pump supplying fuel under pressure to a chamber equipped with a pressure sensor, including the following steps: initializing a computer when the engine is cut off during which cut-off a threshold pressure and a value of a first counter are collected in a memory associated with the computer; measuring the pressure of the fuel in the chamber; incrementing the first counter if the pressure of the fuel in the chamber is above or equal to the threshold pressure; and triggering an alert when the value of the first counter crosses a predetermined threshold.

Disclosed is a method of alerting to the state of a high-pressure pump of an engine including a relief valve, a threshold pressure defining the opening pressure of the relief valve, the pump supplying fuel under pressure to a chamber equipped with a pressure sensor, including the following steps: initializing a computer when the engine is cut off during which cut-off a threshold pressure and a value of a first counter are collected in a memory associated with the computer; measuring the pressure of the fuel in the chamber; incrementing the first counter if the pressure of the fuel in the chamber is above or equal to the threshold pressure; and triggering an alert when the value of the first counter crosses a predetermined threshold.

The invention relates to a method to control a fuel pump for a direct injection system of a heat engine provided with a common rail comprising the steps of determining a minimum threshold based on the pressure in the common rail and on the speed of the heat engine, on the temperature of the high-pressure pump and on the inlet pressure of the high-pressure pump; calculating the objective fuel flow rate to be fed by the high-pressure pump to the common rail instant by instant in order to have the desired pressure value inside the common rail; comparing the objective fuel flow rate with the minimum threshold; and controlling the high-pressure pump based on the comparison between the objective fuel flow rate and the minimum threshold.

The invention relates to a method to control a fuel pump for a direct injection system of a heat engine provided with a common rail comprising the steps of determining a minimum threshold based on the pressure in the common rail and on the speed of the heat engine, on the temperature of the high-pressure pump and on the inlet pressure of the high-pressure pump; calculating the objective fuel flow rate to be fed by the high-pressure pump to the common rail instant by instant in order to have the desired pressure value inside the common rail; comparing the objective fuel flow rate with the minimum threshold; and controlling the high-pressure pump based on the comparison between the objective fuel flow rate and the minimum threshold.

A vehicle includes a pump configured to discharge a fuel by reciprocating a plunger, a rail configured to store the fuel discharged from the pump, and a fuel injection valve configured to inject the fuel supplied from the rail. A controller for the vehicle includes a waveform obtaining unit and a phase shift obtaining unit. The waveform obtaining unit is configured to obtain a waveform of a fuel pressure in the rail as a function of time in a predetermined period. The phase shift obtaining unit is configured to obtain a phase shift based on the waveform obtained by the waveform obtaining unit. The phase shift is an offset between a timing the plunger reciprocated in the pump arrives at a first position and a timing a piston reciprocating in an internal combustion engine arrives at a second position.

A vehicle includes a pump configured to discharge a fuel by reciprocating a plunger, a rail configured to store the fuel discharged from the pump, and a fuel injection valve configured to inject the fuel supplied from the rail. A controller for the vehicle includes a waveform obtaining unit and a phase shift obtaining unit. The waveform obtaining unit is configured to obtain a waveform of a fuel pressure in the rail as a function of time in a predetermined period. The phase shift obtaining unit is configured to obtain a phase shift based on the waveform obtained by the waveform obtaining unit. The phase shift is an offset between a timing the plunger reciprocated in the pump arrives at a first position and a timing a piston reciprocating in an internal combustion engine arrives at a second position.

[Problem to be Solved]

To provide a driving control device for a fuel pump that can properly control the fuel pump such that an operation state is maintained with a simple configuration without requiring a storage capacity for storing a 3D map and a high processing ability for map calculation.

[Solution]

A driving control device for a fuel pump is characterized by including a valve-opening-rate calculating unit 33 that calculates an injector valve opening rate, which is an injection time of an injector per unit time and a driving control unit 34 that sets a voltage duty ratio of a driving voltage that should be applied to the fuel pump that supplies fuel in a fuel tank to a fuel pipe communicating with the injector, in which the driving control unit 34 sets, as a voltage duty ratio of the driving voltage that should be applied to the fuel pump, a value proportional to the injector valve opening rate calculated by the valve-opening-rate calculating unit.

[Problem to be Solved]

To provide a driving control device for a fuel pump that can properly control the fuel pump such that an operation state is maintained with a simple configuration without requiring a storage capacity for storing a 3D map and a high processing ability for map calculation.

[Solution]

A driving control device for a fuel pump is characterized by including a valve-opening-rate calculating unit 33 that calculates an injector valve opening rate, which is an injection time of an injector per unit time and a driving control unit 34 that sets a voltage duty ratio of a driving voltage that should be applied to the fuel pump that supplies fuel in a fuel tank to a fuel pipe communicating with the injector, in which the driving control unit 34 sets, as a voltage duty ratio of the driving voltage that should be applied to the fuel pump, a value proportional to the injector valve opening rate calculated by the valve-opening-rate calculating unit.

Disclosed are a high pressure fuel pump and a liquid petroleum direct injection system including the same. The high pressure fuel pump includes a body having an intake port and an exhaust port, and provided therein with a pressing device configured to press a portion of fuel at a high pressure, a spill valve coupled to one side of the body to control a supply flow rate and exhaust pressure of the fuel, and a cover coupled to an upper portion of the body and having a recovery port for recovering a portion of the fuel to a bombe. The cover has a dome shape that is convex upward. The cover collects gaseous fuel generated by heat of an engine when the engine is turned off after driving, that is, collects vapor to recover the vapor to the bombe, thereby improving the restartability.