Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Takahiko Oono

Toshiaki Date

Yuhei Matsushima

Yasuyoshi Hori

Akira Furuta

Eiji Kanazawa

In a high pressure fuel pump control apparatus for an internal combustion engine which has a high pressure fuel pump of an engine driven type capable of pressure feeding a controlled amount of fuel by driving a fuel suction valve to close at predetermined timing in a fuel delivery stroke, fuel pressure in an accumulator is swiftly raised by reliably pressure feeding a maximum amount of fuel from a fuel delivery stroke immediately after engine starting while avoiding heat generation by a solenoid for controlling the fuel suction valve, whereby deterioration of a combustion state and exhaust emissions at engine starting can be prevented. A starting time control section continuously energizes the solenoid over a period from the beginning of engine starting until when it becomes possible to perform valve closing timing control on the fuel suction valve based on the rotational position of the engine after completion of cylinder identification.

High pressure fuel pump control apparatus for an internal combustion engine

Provision is made to avoid a fuel discharge timing and a fuel injection timing during the ordinary operation of the engine from being limited, by, upon the activation of an engine, making a high-pressure fuel pump perform high-pressure-fuel discharge operation prior to initial fuel discharge operation by a fuel injection valve and based on the condition of the resultant fuel-pressure rise, performing a diagnosis on whether or not a malfunction exists in a high-pressure fuel system.

Control apparatus for internal-combustion engine

A control apparatus for an internal combustion engine, comprising crank angle calculation means for calculating a crank angle between edges which are detected by a first crank angle sensor and a second crank angle sensor, on the basis of a crank cycle between the edges, and engine-rotation-direction detection inhibit means for inhibiting detection of an engine rotation direction on the basis of the calculated crank angle, wherein the engine-rotation-direction detection inhibit means inhibits the detection of the engine rotation direction in a case where the crank angle calculated by the crank angle calculation means has satisfied a predetermined inhibit decision condition.

Control apparatus for internal combustion engine

A high pressure fuel pump control apparatus for an engine can suppress or avoid uncontrolled fuel delivery of a flow control valve upon delivery of a maximum amount of fuel, and resultant great deterioration in drivability and exhaust gas. An advance angle setting limiting section limits a closed position of the flow control valve from being set to a location advanced from a predetermined advance angle limiting position. A flow control valve control section decides a target pressure in accordance with an engine operating condition, and sets the closed position such that the fuel pressure coincides with the target pressure. When the closed position is being controlled to be limited to the advance angle limiting position, and when the fuel pressure does not show a tendency to coincide with the target pressure, the advance angle limiting position is changed from the last set value to a value more retarded therefrom.

High pressure fuel pump control apparatus for an engine

In an energy-saving high-pressure fuel supply control device for sucking a low-pressure fuel via a flow rate control valve and supplying high-pressure fuel acquired by pressurizing the sucked fuel to a fuel rail, at a time point that is logically decided from a bottom dead center and at which the pressure of the high-pressure fuel rises to a pressure to hold closing of the flow rate control valve, energization of the flow rate control valve is ended to restrain energization energy to the flow rate control valve. The time point when the energization of the flow rate control valve is ended is deviated toward lag side in advance by a time that causes deviation of the bottom dead center of the plunger toward the lag side from the original bottom dead center.

Energy-saving high-pressure fuel supply control device for internal combustion engine

A high-pressure fuel pump control device for an internal combustion engine includes a feedback quantity calculating unit () for calculating a fuel discharge feedback quantity (QFB) of a high-pressure pump according to a proportional integral operation based on a pressure deviation (&#x394;PF) between a target pressure (PO) and a fuel pressure (PF), a flow control valve controlling unit () for setting drive timing (TD) of a flow control valve () on the basis of a target fuel discharge quantity (QO), and an integral operation update prohibiting unit for prohibiting, when the number of times of calculation of the fuel discharge feedback quantity (QFB) reaches a first predetermined number of times while a sign of the pressure deviation (&#x394;PF) does not invert, update of an integral operand (QFBI), and for resuming, when the sign of the pressure deviation (&#x394;PF) inverts thereafter, the update of the integral operand (QFBI).

High-pressure fuel pump control device for internal combustion

A fuel injector control apparatus for a cylinder injection type engine includes driving circuits each shared by plural fuel injectors classified groupwise and having one ends connected in common to a potential source, switching means () connected to the potential source for turning on/off driving currents supplied to the injectors of a same group, a fuel quantity/injection timing arithmetic means () for determining a fuel supply quantity and a fuel injection timing on the basis of outputs from various sensors (), driving circuits () for firing the switching means in response to output of the fuel quantity/injection timing arithmetic means (), and a ground fault identifying/discriminating means () for specifying a fault location upon occurrence of a ground fault. When the fault location is specified, fuel injection from other injector of the injector group to which the fault suffering injector belongs is stopped.

Fuel injector control apparatus for cylinder injection type internal combustion engine

A fuel injection control device of an internal combustion engine includes fuel injection valve control means which calculates a basic fuel injection flow rate which becomes a target air-fuel ratio corresponding to an engine operation state and performs a driving control of the fuel injection valve, a fuel pressure sensor which detects a fuel pressure in the inside of the pressure storage chamber, a discharge amount control valve for controlling a fuel amount supplied to the pressure storage chamber from the high-pressure pump, and fuel pressure control means which controls the discharge amount control valve such that the fuel pressures in the inside of the pressure storage chamber agrees with a preset target fuel pressure, wherein the fuel injection control device includes fuel increase correction means which increases the basic fuel injection flow rate in a state that a rotational speed of the engine falls in a given preset rotational speed region where the minimum discharge flow rate of the high-pressure pump is expected to exceed zero and the fuel pressure in the inside of the pressure storage chamber is higher than the target fuel pressure.

Fuel injection control device of internal combustion engine

A fuel pressure control apparatus for a multicylinder internal combustion engine includes fuel injection valves arranged one for each of M cylinders (M&#x2267;3), a fuel rail, a high pressure fuel pump performing N (&#x2267;2) fuel discharge strokes to the fuel rail during a fuel injection stroke makes a round of the cylinders, a fuel discharge amount control valve, an FF amount calculation section for calculating the fuel discharge amount based on the fuel injection amount, and a fuel discharge amount control section for determining the fuel discharge amount based on the FF amount and setting the drive timing of the fuel discharge amount control valve. The fuel injection amount multiplied by M/N is used as an FF amount in the fuel discharge amount three times while the fuel injection stroke makes a round of the cylinders.

Fuel pressure control apparatus for multicylinder internal combustion engine

An internal combustion engine fuel pressure control apparatus includes: fuel pressure control means including a spill valve and a high-pressure fuel pump that pressure-feeds fuel to an accumulation chamber; and control means that calculates a control quantity of the fuel pressure control means on the basis of pressure information of fuel supplied to an injector and variably sets the pressure of the fuel supplied to the injector, wherein the control quantity calculated by the control means is configured by a first feedback quantity that feeds back the fuel quantity that the high-pressure fuel pump pressure-feeds to the accumulation chamber and a second feedback quantity that feeds back the timing at which the spill valve opens or closes a fuel relief path.

Internal combustion engine fuel pressure control apparatus

A fuel pressure control device includes a fuel injection valve, a pressure accumulation chamber for storing a high pressure fuel, a high pressure pump, a fuel pressure control valve, a fuel pressure sensor for detecting a fuel pressure PR in the pressure accumulation chamber, an air-fuel ratio sensor for detecting an air-fuel ratio condition, target value calculation means for calculating a target fuel pressure and a target air-fuel ratio AFo, fuel pressure control means for performing feedback control of the fuel pressure control valve such that the fuel pressure PR matches the target fuel pressure, abnormality diagnosis means for diagnosing the fuel pressure sensor, and fuel pressure estimation means for calculating an estimated fuel pressure PRs based on the air-fuel ratio condition when an abnormal condition occurs. The fuel pressure estimation means corrects the estimated fuel pressure PRs such that the air-fuel ratio condition is guided to the target air-fuel ratio AFo.

Fuel pressure control device for internal combination engine

The present invention provides a fuel injection control device which can prevent the occurrence of a phenomenon that when a pressure of fuel in the inside of a pressure storage chamber is elevated during a fuel cut, and the injection of fuel is restarted, the fuel is injected at a high fuel pressure largely different from a target fuel pressure. Accordingly, the fuel injection control device can prevent the deterioration of an exhaust gas and the occurrence of an engine stop. The fuel injection control device includes fuel injection valve control means which performs a driving control of the fuel injection valves, a fuel pressure sensor which detects a fuel pressure in the inside of the pressure storage chamber, a discharge amount control valve which controls a fuel amount supplied from the high-pressure pump to the pressure storage chamber, and fuel pressure control means which controls the discharge amount control valve such that the fuel pressure in the inside of the pressure storage chamber agrees with a target fuel pressure, wherein when the fuel pressure in the inside of the pressure storage chamber assumes a given pressure state during a fuel cut control, the forced fuel injection control means gives a driving instruction to the fuel injection valve control means to interrupt the fuel cut control thus enabling forced driving of the fuel injection valves of given cylinders.

To provide a fuel supply device for an internal combustion engine including an ECU (), in which, when the pressure in the fuel rail () is a high pressure greater than a maximum pressure (Pm) that can drive the injector () and the stopped engine (), the ECU () opens the injector () to inject high pressure fuel in the fuel rail () into the stopped engine ().

Fuel supply device for an internal combustion engine

A fuel pressure control apparatus for a cylinder injection type engine capable of restarting the engine without fail notwithstanding increase of fuel pressure due to temperature rise immediately after stoppage of engine operation. Fuel is supplied from a high pressure fuel pump () to a fuel rail () to be injected by fuel injection valves () into combustion chambers () of cylinders. An ECU () estimates increment (&#x394;P) of the fuel pressure (PF) within the fuel rail () after stoppage of the engine operation on the basis of a water temperature (THW) and an intake air temperature (THA) to restrict a maximum value of a desired fuel pressure (Po) so that a sum value (PM) of the desired fuel pressure (Po) and the increment (&#x394;P) does not exceed the critical actuation pressure (Pi) of the fuel injection valve ().

Fuel pressure control apparatus for cylinder injection type internal combustion engine

Apparatus for diagnosing high pressure fuel system of a cylinder injection type engine includes fuel pump (), spill valve (), fuel injectors (), fuel pressure sensor () and fuel pressure control means (). A control period for the pump () covers an intake period and a discharge period. The discharge period covers spill valve closing period and spill valve opening period. Fuel pressure control means () includes spill valve control period setting means for adjusting spill valve closing/opening periods, abnormality decision period detecting means for detecting as abnormality decision period the spill valve opening period during the discharge period in the engine operation, pressure change arithmetic means for determining change of the fuel pressure (PF) on the basis of the abnormality decision period, and diagnosing means for deciding as to abnormality of the spill valve (), based on the change of the fuel pressure (PF).

Growing community of inventors

Hyogo, Japan

Takahiko Oono