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Lockup control of torque converter

A torque converter and locking technology, applied in the field of meshing force control, can solve problems such as engine speed fluctuations and sudden release of lock-up clutches

Inactive Publication Date: 2009-02-04
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Then, according to the prior art, during the engagement of the lock-up clutch, the engine speed can fluctuate considerably, and a sudden release of the lock-up clutch can occur

Method used

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  • Lockup control of torque converter
  • Lockup control of torque converter
  • Lockup control of torque converter

Examples

Experimental program
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Effect test

Embodiment Construction

[0033] Referring to FIG. 1 , a vehicle multi-cylinder engine 21 is connected to an automatic transmission 23 through a torque converter 1 , and the output torque of the automatic transmission 23 is transmitted to drive wheels 25 through a differential 24 . The automatic transmission 23 consists of continuously variable transmissions.

[0034] The torque converter 1 is equipped with a pump impeller (pump impeller) 1a driven by an engine 21, a turbine runner (turbine runner) 1b connected to an input shaft of an automatic transmission 23, and a lock-up clutch directly connecting the pump impeller 1a and the turbine runner 1b. (lockup clutch)2.

[0035] The engagement force of the lock-up clutch 2 is determined by the pressure difference (PA-PR) between the applied pressure PA and the released pressure PR.

[0036] When the applied pressure PA is smaller than the released pressure PR, the lock-up clutch 2 will be in an unlocked state, and the pump impeller 1a and the turbine whee...

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PUM

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Abstract

An engaging force of a pump impeller (1a) connected to an engine (21) and a turbine runner (1b) connected to an automatic transmission (23) is controlled by a controller (5). The controller (5) determines a target relative rotation speed of the pump impeller (1a) and the turbine runner (1b), and performs feedback control of the engaging force such that the difference between the target relative rotation speed and the real relative rotation speed is decreased. The controller (5) also performs feedforward control of the engaging force in a increasing direction. When the engine (21) is in a predetermined engine-stall prevention condition, the controller (5) prohibits the feedforward control so as to prevent an interference between feedback control and feedforward control.

Description

technical field [0001] The present invention relates to the control of the engagement force of a lock-up clutch related to a torque converter for a vehicle. Background technique [0002] US Patent No. 6,066,072 discloses lock-up control of a lock-up clutch related to a torque converter for a vehicle. The torque converter connects the vehicle's engine and automatic transmission, including a pump impeller connected to the engine, and a torque converter turbine connected to the transmission. The output torque of the engine is transmitted to the transmission by means of the fluid between the pump impeller and the turbine. The lock-up clutch engages the pump impeller and turbine for direct torque transfer. [0003] The ratio of the torque transmitted by the fluid to the torque transmitted by the lock-up clutch depends on the applied engagement force to engage the lock-up clutch. When the meshing force is extremely small, the entire torque is transmitted through the fluid, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/14B60K17/10B60W10/02
CPCF16H61/143B60W2050/0008B60W2050/0012F16H2061/145
Inventor 濑川哲安达和孝
Owner NISSAN MOTOR CO LTD