Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Toshikazu Koide

Shuji Nagano

Takehisa Yaegashi

Shuichiro Ida

Toshio Yoshinaka

Shoji Haga

An electric control apparatus for a transfer device in a part-time four-wheel drive vehicle is arranged to permit switchover of the transfer device from the two-wheel drive mode to the four-wheel drive mode when a difference in rotational speed between front and rear propeller shafts is smaller than a predetermined value and to prohibit switchover of the transfer device from the two-wheel drive mode to the four-wheel drive mode when the difference in rotational speed between the front and rear propeller shafts is larger than the predetermined value.

Electric control apparatus for transfer device in part-time four-wheel

In electronically controlling the amount of fuel passing through an electromagnetic valve into an intake system of an engine, the period during which fuel is injected is advanced at low engine temperatures as compared with the fuel injection period at high temperatures. As a result, a sufficiently long duration of time is created from fuel injection until burning, so that the fuel will be more completely atomized even at low engine temperatures, resulting in good fuel combustion.

Electronically controlled fuel injection method and apparatus

Disclosed is an apparatus for controlling secondary air for purifying exhaust gas discharged from an internal combustion engine. The apparatus comprises a pair of catalytic converters disposed in series within an exhaust system, a secondary air switching device communicated with two positions each of which is located respectively upstream of each of the catalytic converters, an actuating device for selectively communicating the secondary air switching device with each of the above-mentioned two positions, and a detecting device for detecting the temperature of the first catalytic converter located upstream of the second converter. If the detecting device detects a condition wherein the temperature of the first catalytic converter is lower than a predetermined level, secondary air is supplied to the position upstream of the first catalytic converter. On the other hand, if the detecting device has detected a condition wherein the temperature of the first catalytic converter is above the predetermined level, secondary air is alternately supplied to each of the above-mentioned two positions. By utilizing the apparatus of the present invention, the converting efficiency of the first catalytic converter can be maintained at a high level.

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Susono, Japan

Toshikazu Koide