Nippondenso Co., Ltd.

Shunichiro Hiromasa

Toshio Kondo

Masumi Kinugawa

Akio Kobayashi

Tomoaki Abe

Hiroshi Tamura

Masahiko Miyaki

Akira Masuda

An electronic fuel injection device for pumping fuel to an internal-combustion engine by using the expansion-contraction characteristics of a piezoelectric device. The electronic fuel injection device has a pump member integrally formed and having a number of pistons corresponding to the number of cylinders of the associated internal-combustion engine, and a single actuator for driving the pump member. Accordingly, the same pressure is generated in all of the pump chambers when the pump member is driven by the actuator for each fuel injection cycle. Each pump chamber is connected to a fuel feed passage connected to a fuel tank and to a fuel injection passage connected to a fuel injection nozzle, and is filled with the fuel. The pump chambers are pressurized uniformly to distribute the fuel uniformly to the cylinders regardless of the passage characteristics of the fuel injection passages.

Electronic fuel injection device

An apparatus for measuring a flow of intake air to an engine includes a bridge circuit including a heat resistor placed in an intake air path of the engine, a resistor for sensing the temperature of the intake air, and a plurality of balance resistors. A heating current is supplied to this bridge circuit through a transistor controlled by a periodical current-passage control signal generated by a microcomputer. A signal Vh, representing a temperature change of the heat resistor heated by the heating current, is detected by the microcomputer. A first correction value is computed by using a difference between the detected value from the microcomputer and a signal Vho, representing temperature of the heat resistor when the bridge circuit is balanced at normal temperature. A time width correction value .DELTA.Do1 is computed from a table on the basis of the first correction value. The correction signal .DELTA.Do1 is used for correcting the current passage time. The current passage time width as corrected is used for computing a flow of the intake air.

Apparatus for measuring a flow rate of intake air for an engine

In a method for correcting the controlled variable of an engine according to the present invention, the quantity of suction air is measured by means of a thermal type flowmeter. The magnitude of pulsation of the suction air is obtained on the basis of the differential or variation of the measured section air quantity. At the same time, a coefficient representing the susceptibility to the pulsation which depends on the layout of the thermal type flowmeter and the like and the engine speed is calculated. A final correction for correcting the controlled variable is obtained on the basis of the magnitude of the pulsation and the coefficient representing the susceptibility.

Method for correcting a controlled variable for the control of the

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Okazaki, Japan

Shunichiro Hiromasa