Hydraulic system control device and valve timing control device

A technology of valve timing control and hydraulic system, which is applied in the direction of fluid pressure actuation system components, mechanical equipment, engine control, etc., and can solve problems such as inaccurate estimation of oil viscosity
CN101828007AInactive Publication Date: 2010-09-08TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2010-09-08
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

When a hydraulic pressure generation source begins to generate hydraulic pressure, the present invention measures the hydraulic pressure in an oil supply line connected to a hydraulic actuator, and sets a viscosity index value indicating an oil viscosity in accordance with the pace at which the measured hydraulic pressure rises. The viscosity index value is calculated and set so that the slower the pace at which the measured hydraulic pressure rises, the higher the viscosity indicated by the viscosity index value.
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Description

technical field

[0001] The present invention relates to a control device for a hydraulic system having hydraulic actuators that operate upon receiving a supply of oil, and also to a valve timing control device for The valve timing of the internal combustion engine is controlled by using a variable valve timing mechanism as a hydraulic actuator. Background technique

[0002] Known conventional variable valve timing mechanisms disclosed, for example, in Patent Documents 1 to 6 vary the valve timing of an internal combustion engine by changing the phase angle of a camshaft relative to a crankshaft. A common variable valve timing mechanism includes a housing coupled to the crankshaft by a belt or chain and a vane assembly secured to the camshaft. The vane assembly is received in the housing to form a hydraulic chamber between the vane assembly and the housing. When oil is supplied to the hydraulic chamber with the oil supply amount controlled by the control valve, the vane ass...

Claims

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