Method for controlling clutch in vehicle transmission system equipped with friction type stepless speed changer

A friction clutch, clutch technology, applied in the direction of clutch, mechanical equipment, etc., can solve the problem of inability to distinguish clutch slip, complexity, and the weakening ability of the clutch to suppress torque vibration.

Active Publication Date: 2008-12-10
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The known method has the disadvantage that the control of the clutch slip is integrated with the control of the normal force of the transmission, so it is relatively complex
Also, this known control cannot distinguish whether an increase in clutch slip is due to said torque oscillations or a driver-initiated increase in engine torque
This means that the clutch's ability to dampen torque oscillations will be reduced during driver-initiated vehicle acceleration

Method used

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  • Method for controlling clutch in vehicle transmission system equipped with friction type stepless speed changer
  • Method for controlling clutch in vehicle transmission system equipped with friction type stepless speed changer

Examples

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Embodiment Construction

[0015] figure 1 A vehicle drive train is described which includes, in order (ie, in the direction downstream of the driving force) an engine 1, a frictional continuously variable transmission 2, a friction clutch 3, a final drive 4 including a differential transmission and two driven wheels 5. The transmission shafts 12, 23, 34 and 45 are provided between and drivingly connected with the components 1-5 of the upper transmission train. figure 1 A clutch slip control device is also schematically shown in , which includes two speed sensors 6 and 7, which measure the speed Ci on the input side of the clutch (ie, shaft 23) and the speed Co on the output side of the clutch (ie, shaft 34). An electronic clutch control unit 8 or "ECCU" and a clutch actuator 9 which controls the action of the clutch 3 (eg by adjusting the hydraulic clutch engagement pressure P).

[0016] From this, it is known that the ECCU 8 is set and operated such that the desired clutch slip amount Cs is reached ...

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Abstract

The invention relates to a method for controlling a friction clutch (3) in a vehicular drive line further provided with an engine (1), a friction-type continuously variable transmission (2) and a driven wheel (5), which method comprises the steps of controlling a slip value (Cs) of the clutch (3), of detecting the occurrence of a torque jolt (block A) and, if no such torque jolt is detected, of performing the clutch slip (Cs) control closed-loop (block B), or, if a torque jolt is detected, of performing the clutch slip (Cs) control open-loop (block C).

Description

technical field [0001] The present invention relates to a method for controlling a friction clutch in a vehicle drive train provided with a frictional continuously variable transmission. Such a control method is well known, for example US-A-4606446 describes a transmission having two variable pulleys and a drive belt wound around and in frictional contact with the two pulleys. Background technique [0002] A common problem encountered in friction transmissions is slip between friction components, such as between a drive belt and a pulley, which needs to be avoided because excessive slip can cause excessive wear and tear on these components Or at least it can happen within a limited confines. To prevent these slippages, a sufficient normal force is applied between the friction components, which is usually determined based on the engine torque delivered by the transmission plus a safety margin. This safety margin is introduced because engine torque is not precisely available...

Claims

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Application Information

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IPC IPC(8): F16D48/06
CPCF16D48/06F16D2500/10412F16D2500/1045F16D2500/1088F16D2500/30406F16D2500/3065F16D2500/3115F16D2500/50293F16D2500/70252F16D2500/70426F16D2500/70652
Inventor A·A·H·M·范东恩
Owner ROBERT BOSCH GMBH
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