Nissan Motor Company Limited

The Toyo Rubber Co., Ltd.

Nagayuki Marumo

Haruhiko Iizuka

Fukashi Sugasawa

Junichiro Matsumoto

Masahiro Ishigaki

Keiichiro Yabuta

Ken Ishihara

Yoshiki Mayama

Yoichi Shimabara

In an automatic power transmission system for a multicylinder internal combustion engine wherein the intake vacuum is not available as a true indication of engine load, a detection system for detecting the level of engine load includes an electrical actuator responsive to a signal which faithfully represents the engine load to vary the pressure of fluid in the automatic power transmission system. One embodiment of the invention includes an intake air sensor, an engine speed sensor and a division circuit responsive to the outputs from both sensors to generate a signal representing the quantity of air inducted per unit time to represent the true indication of the engine load free from the effect of exhaust gas recirculation or other factors influencing the intake vacuum.

Engine load detection system for automatic power transmission

A split engine operation of a multi-cylinder internal combustion engine having a closed loop or feed back control system is disclosed. At split engine operation mode, the feed back control will be suspended, and at full cylinder engine operation mode, the feed back control will be resumed. A relay is provided to suspend the supply of output from a PI detector to a fuel injection control unit. The relay is circuited with a cylinder selector unit via a counter so that the resumption of the supply of the output from the PI detector to the fuel injection control unit will take place when a predetermined time duration has past after the engine operating condition switched into full cylinder engine operation mode from split engine operation mode.

Split engine operation of closed loop controlled multi-cylinder internal

Projections made of a different and less abrasion resistant kind of rubber to that constituting the exterior of the tire are arranged to contact the road during low pressure conditions, whereby the amount of rubber worn off indicates the amount of fatigue accumulated and degree of internal damage done by running the tire at that pressure.

Pneumatic tire with an internal damage indicator

Growing community of inventors

Yokohama, Japan

Nagayuki Marumo