Isuzu Motors Limited

Tomoo Nishikawa

Keiichi Iida

Kenzo Shioi

Hirotaka Takahashi

Takeshi Fukuoka

A selective catalytic reduction (SCR) system that can detect whether or not a float is stuck even where a water level sensor that detects a liquid level in a stepwise manner is used, including: an urea injection quantity integrating unit that integrates an injected quantity of urea to calculate an urea injection quantity integrated value; an integrated value resetting unit that, if a detected value from detection means changes, resets the urea injection quantity integrated value; and an abnormality determination unit that, if the urea injection quantity integrated value exceeds a predetermined threshold value for determination, determines a level sensor as having an abnormality.

Selective catalytic reduction system

An arrangement for controlling fuel injection in a diesel engine to prevent generation of smoke even when an accelerator pedal is stamped during idling. A basic amount of fuel injection Q,is determined from an engine revolution speed Ne and accelerator opening degree Ac. A maximum amount of fuel injection Q,is determined from the engine revolution speed Ne and an intake air flow rate MAF. It is then determined whether a first condition of vehicle speed being zero and a second condition of accelerator opening degree being not zero both hold true. The maximum amount of fuel injection Q,is corrected to a smaller value Q,when both the first and second conditions are met. In this case, the basic amount of fuel injection Qbase is compared with the reduced maximum amount of fuel injection Q,and the smaller one is selected as a target amount of fuel injection Q,.

Method and apparatus for controlling fuel injection in diesel engine

In an electronic fuel injection apparatus comprising a control circuit of an electromagnetic spill valve for adjusting a fuel injection quantity in a distribution-type fuel injection pump for a diesel engine, and a computing unit for providing a command signal to the control circuit, a driving current flowing through a solenoid of an electromagnetic spill valve is detected, a state where a delay time interval from a transit point of a command signal provided to the control circuit to a delay point at which the driving current crosses a threshold value is equal to or more than a predetermined value is determined as a slightly abnormal state to invalidate the command signal for a pilot injection, or a state where the delay time interval exceeds an allowable value further larger than the predetermined value is determined as a seriously abnormal state to stop the engine.

Electronic fuel injection apparatus

In an electronic fuel injection apparatus which controls a fuel injection timing of a fuel injection pump for a diesel engine through a timing control valve, when the time during which a present final feedback correction quantity obtained by adding, to the last final feedback correction quantity, the present feedback correction quantity which is computed according to a difference between an actual fuel injection timing and a target fuel injection timing, reaches a lower limit or an upper limit and also the difference is outside a predetermined range, lasts for a predetermined time, controlling a timing control valve is stopped.

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Fujisawa, Japan

Tomoo Nishikawa