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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

Inactive Publication Date: 2010-09-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current oil viscosity cannot be accurately estimated by considering the oil temperature alone

Method used

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  • Hydraulic system control device and valve timing control device
  • Hydraulic system control device and valve timing control device
  • Hydraulic system control device and valve timing control device

Examples

Experimental program
Comparison scheme
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no. 1 approach 〗

[0127] will now refer to Figure 1 to Figure 5 A first embodiment of the present invention relating to a valve timing control apparatus for an internal combustion engine (hereinafter simply referred to as an engine) will be described.

[0128] Can refer to figure 1 The configuration of the valve timing control apparatus according to the first embodiment will be outlined. figure 1 A hydraulic circuit for a valve timing control device applied to an intake valve is shown. As shown in the figure, the valve timing control apparatus includes a variable valve timing mechanism (hereinafter referred to as VVT) 20 as a hydraulic actuator. The VVT ​​20 includes a housing 22 coupled to the crankshaft by a belt or chain and a vane assembly 24 that rotates with a camshaft located inside the housing 22 .

[0129] Two oil chambers 26 , 28 are formed within the housing 22 and are separated from each other by the vane assembly 24 . The VVT ​​20 changes the volume ratio between the two oil c...

no. 2 approach 〗

[0166] will now refer to figure 1 and Figure 8 to Figure 11 A valve timing control apparatus according to a second embodiment of the present invention is described.

[0167] The valve timing control apparatus according to the second embodiment includes a hydraulic circuit configured the same as that of the first embodiment. Therefore, the following description assumes that the hydraulic circuits employed are constructed to match those used in the figure 1 The same as in the first embodiment shown.

[0168] The valve timing control apparatus according to the second embodiment is similar to the valve timing control apparatus according to the first embodiment in that the oil viscosity is reflected in the operation prohibition time setting of the VVT ​​20 . However, the difference between the second embodiment and the first embodiment lies in the method of judging the oil viscosity.

[0169] The oil viscosity judging method employed in the second embodiment will now be descri...

no. 3 approach 〗

[0183] will now refer to figure 1 and Figure 12 to Figure 15 A valve timing control apparatus according to a third embodiment of the present invention will be described.

[0184] The valve timing control apparatus according to the third embodiment includes a hydraulic circuit configured the same as that of the first embodiment. Therefore, the following description assumes that the hydraulic circuits employed are constructed to match those used in the figure 1 The same as in the first embodiment shown.

[0185] The valve timing control apparatus according to the third embodiment is similar to the valve timing control apparatuses according to the first and second embodiments in that the oil viscosity is reflected in the operation prohibition time setting of the VVT ​​20 . However, the third embodiment differs from the first and second embodiments in the method of judging the oil viscosity.

[0186] The oil viscosity judging method employed in the third embodiment will now b...

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PUM

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01M11/10F02D13/02F01L9/02F16N29/00
CPCF01L1/3442F01M11/10F01L2800/12F15B21/045Y02T10/18F01L2001/3443F01L2800/01F01L2800/05F02D13/02Y02T10/12
Inventor 吉冈卫
Owner TOYOTA JIDOSHA KK
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