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Valve timing adjustment device

A valve timing control, valve technology, applied in the direction of valve device, valve details, output power, etc., can solve the problem of attenuation that cannot obtain rotation

Active Publication Date: 2010-01-20
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the motor shaft has been found to rotate without the magnetic holding torque and the cam torque being brought into balance, so when the magnetic holding torque is averaged by alternating between positive and negative directions, it is not possible to obtain decay of rotation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0111] figure 2 The valve timing control device 1 according to the first embodiment is shown. The valve timing control device 1 is provided in a transmission system installed in a vehicle for transmitting motor torque from a crankshaft (not shown) to a camshaft 2 of an internal combustion engine installed in the vehicle.

[0112]Hereinafter, the basic configuration of the valve timing control device 1 will be explained. The valve timing control device 1 can be used to combine the electric motor 4, the current control system 6 and the phase control mechanism 8, and control the engine phase between the crankshaft and the camshaft 2 to determine the valve timing. In this embodiment, the camshaft 2 opens / closes an intake valve (not shown) of the internal combustion engine, and the valve timing control device 1 controls the valve timing of the intake valve.

[0113] like figure 2 and image 3 As shown, the motor 4 may be a brushless motor provided with a housing 100 , a beari...

no. 2 example

[0165] like Figure 15 As shown, the second embodiment is a modification of the first embodiment. In the second embodiment, during the torque cancellation process of the correct / incorrect determination by S105, after the correct / incorrect determination of the direction Dca0 is determined according to the first embodiment, the braking torque is applied to the motor shaft 102, thereby gradually eliminating the motor torque Tm.

[0166] More specifically, after the control circuit 120 makes the correct / incorrect determination of the determination direction Dca0 to balance the torques Tm, Tca, and Th, the control circuit 120 first sets the target number of rotations St, the target rotation direction Dt, and the target drive system Ft is set as an OR control value, and the result is output to the power supply block 134 of the driving circuit 130 . The target number of revolutions St is set to a predetermined intermediate value between the initial value at the time of correct / inco...

no. 3 example

[0172] like Figure 16 As shown, the third embodiment is a modification of the first embodiment. In the third embodiment, in the control process at the stop time, S104 is not executed after S101 to S103 are executed, unlike S105 of the first embodiment, the torque canceling process of direction determination is executed as S204.

[0173] More specifically, in S204, in addition to setting the target rotation direction Dt to the predetermined set direction Ds, firstly, the correct / incorrect determination of the determined direction Dca0 in the first embodiment is generated in accordance with the target rotation number St The initial value of corresponds to the motor torque Tm.

[0174] Therefore, when the motor torque Tm is generated in the set direction Ds to accurately oppose the cam torque Tca, in the case where the motor shaft 102 does not rotate or when the motor shaft 102 rotates slightly in the opposite direction to the set direction Ds, Motor torque Tm is balanced with...

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PUM

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Abstract

A valve timing adjustment device has an electric motor (4) where magnetic holding torque (Th) and motor torque (Tm), which is generated by electric current, are generated on a motor shaft (102), an electric current flow control system (6) as a control section that adjusts the motor torque (Tm) by controlling electric current flow to the electric motor (4), and a phase adjustment mechanism (8) that, while transmitting CAM torque (Tca), which alternately takes positive and negative directions according to rotation of a cam shaft, to the motor shaft (102), adjusts relative phases between a crankshaft and the cam shaft according to torque balance on the motor shaft (102). After an internal combustion engine is stopped, the electric current flow control system (6) fades the motor torque (Tm) that is balanced with magnetic holding torque (Th) and the cam torque (Tca) (S105).

Description

[0001] Cross References to Related Applications [0002] This application is based on Japanese Patent Application No. 2007-148607 filed on June 4, 2007 and Japanese Patent Application No. 2008-130009 filed on May 16, 2008, and these two patent applications are incorporated herein. technical field [0003] The present application relates to a valve timing control device in an internal combustion engine that controls valve timing of at least one of an intake valve and an exhaust valve that is opened / closed by a camshaft through torque transmission from a crankshaft. Background technique [0004] A conventional valve timing control device controls the relative phase between the crankshaft and the camshaft (hereinafter referred to as "engine phase") so that the To the phase control mechanism to determine the valve timing. JP2005-146993A describes a valve timing control device that ensures the start performance of an internal combustion engine by keeping the engine phase of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/34F01L13/00F02D13/02
CPCF01L1/022F01L2800/03Y02T10/18F02D13/0219F01L2800/01F01L1/352F01L2800/00F01L2820/032F01L1/34409F01L2201/00F02D2013/0292Y02T10/12F01L1/34F01L13/00F02D13/02
Inventor 上滨基森井泰词
Owner DENSO CORP
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