Electric controllable hydraulic system for vehicle transmission and its control method

A hydraulic system, electronically controlled hydraulic technology, applied in the direction of transmission control, fluid pressure actuation system components, servo meter circuit, etc., can solve the problems of complex and difficult continuous actuation, achieve stable and accurate pressure response, reduce The effect of static friction

Active Publication Date: 2022-03-29
PUNCH POWERTRAIN NV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, controlled continuous actuation can be complicated by the friction that occurs in these elements
In particular, small changes in actuation may be difficult to achieve because the change in hydraulic force required to achieve the small change may not be sufficient to exceed the stiction within the pressure control module

Method used

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  • Electric controllable hydraulic system for vehicle transmission and its control method
  • Electric controllable hydraulic system for vehicle transmission and its control method
  • Electric controllable hydraulic system for vehicle transmission and its control method

Examples

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Embodiment Construction

[0022] Unless otherwise indicated, the same reference numerals in the various drawings indicate the same elements.

[0023] figure 1 Schematically illustrated is an electro-controllable hydraulic system 1 for a vehicle transmission 60 to couple and transmit engine power to the tires of the vehicle by actuation of at least one transmission element 2 of the vehicle transmission via the hydraulic system. Generally, a transmission provides controlled application of engine power through the conversion of speed and torque from a power source such as, for example, an internal combustion engine or electric machine. A hydraulic system may provide actuation of friction elements in a vehicle transmission to couple the transmission input to a gear train to transmit engine power to the vehicle's tires. Such transmissions, such as CVT transmissions, may include friction elements. The friction elements may be embodied as pulleys between which flexible elements such as chains or conveyor be...

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Abstract

An electrically controllable hydraulic system for vehicle transmission and a control method thereof. An electro-controllable hydraulic system (1) for vehicle transmission, comprising a pressure pump system (4a, 4b) and a subsystem (1A), the subsystem (1A) comprising a transmission element (2) and an electro-hydraulic control module ( 1B), the electro-hydraulic control module (1B) comprises a hydraulic valve element (15) for controlling the hydraulic pressure for actuating the transmission element (2) and an electromagnetically controllable operating element for operating the hydraulic valve element (15) (twenty one). The subsystem (1A) and pressure control module (1B) have first and second cutoff frequencies (f1, f2), where f2>f1. The hydraulic system includes a drive circuit (32) for driving the pressure control module (1B), the drive circuit (32) includes a full bridge circuit and a control circuit (42), the control circuit (42) is used to , f2) in frequency (f dith ) jittered input signal (I set ) input value, the two switching elements of the drive circuit are simultaneously controlled with a duty cycle.

Description

Background technique [0001] The invention relates to an electrically controllable hydraulic system for vehicle transmission. [0002] The invention also relates to a method for electrically controlling a hydraulic system for a vehicle transmission. [0003] A vehicle transmission for coupling and transmitting engine power to vehicle tires may include a number of transmission elements that need to be controllably actuated over a continuous driving range, such as clutch elements and torque control elements. Another example of a transmission element is a friction element, which is used to grip a flexible element in a variable transmission system, such as a chain or a conveyor belt. In an electrohydraulic system for vehicle transmission, the transmission elements are actuated by hydraulic pressure controlled by an electrohydraulic control module comprising a hydraulic valve element and an electromagnetically controllable operating components (such as solenoid valves). In practi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F15B1/00
CPCF16H61/0251F15B2211/20576F15B2211/50554F15B2211/5158F15B2211/527F15B2211/41563F15B2211/427F15B2211/50518F15B2211/50536F15B21/08B60W10/10F16H61/02F15B1/00F15B15/20F15B2211/505F16H61/0021F16H2061/0255F15B13/043F15B13/0431
Inventor R·K·拉维德兰T·F·A·范埃尔斯
Owner PUNCH POWERTRAIN NV
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