VARIABLE VALVE TIMING CONTROL DEVICE

Japanese Patent JPH0598916

A

PURPOSE:To maintain the torque balance between air cylinders to avoid the generation of the extreme unstable condition even in the case that one variable valve timing mechanism is out of order. CONSTITUTION:A variable valve timing control device is provided with a pair of variable valve timing mechanisms 51, variable sensors 43, 47, 48 for detecting throttle open degree, engine speed and the water temperature to detect the driving condition, a clank angle sensor 44 for detecting the real valve timing of an intake valve 26, a cam angle sensor 45, a control device 65 for controlling the variable timing mechanisms 51 on the basis of the detecting signal of the variable sensors. The control device computes a target valve timing common to intake valves, and detects the malfunction of the variable valve timing mechanism on the basis of a deviation between the computed value and each real valve timing. When the control device detects the malfunction, the control device makes the target valve timing coincide with the real valve timing of the variable valve timing mechanism, of which malfunction is detected, forcedly.

KASHIWAKURA TOSHIMI
IWASHITA YOSHIHIRO
GOTO MASAHITO

JP26232891A

April 20, 1993

October 09, 1991

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TOYOTA MOTOR CORP

F01L1/12; F01L1/34; F01L13/00; F02B29/08; F02B75/22; F02D13/02; (IPC1-7): F01L1/12; F01L1/34; F01L13/00; F02B29/08; F02B75/22; F02D13/02

Hironobu Onda

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