Clutch actuation device

• US 4,796,739 A
• Filed: 06/17/1987
• Issued: 01/10/1989
• Est. Priority Date: 09/10/1986
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Jonner, Wolf-Dieter, Zechmann, Jurgen
• Primary Examiner(s): Bonck, Rodney H.
• Application Number:
  US07/062,991
• Time in Patent Office: 573 Days
• Field of Search: 192/0.055, 192/13 R, 192/0.094, 192/0.096, 192/85 C, 192/30 R, 192/82 R, 192/85 R, 192/84 R, 180/197
• US Class Current: 192/13.00R
• CPC Class Codes: B60T 8/3215 Systems characterised by having means acting on components of the drive line, e.g. retarder, clutch or differential gear B60T8/322 takes precedence
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 2510/0225 Clutch actuator position
• CPC Class Codes: B60W 2520/26 Wheel slip
• CPC Class Codes: B60W 2540/14 Clutch pedal position
• CPC Class Codes: B60W 2710/021 Clutch engagement state
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: F16D 2500/1026 Hydraulic
• CPC Class Codes: F16D 2500/31413 Clutch pedal position
• CPC Class Codes: F16D 2500/3144 Accelerator pedal position
• CPC Class Codes: F16D 48/066 Control of fluid pressure, e.g. using an accumulator F16D48/062, F16D48/068 take precedence

Abstract

The present invention relates to a clutch actuation device wherein the functional connection between actuation of the clutch and the excursion of the clutch pedal is made via an interposed electronic control unit. A first depression sensor is located on the clutch pedal for the purpose of determining the set value and a further sensor for determining the actual value is located on a lever of the clutch. The lever is connected to an actuation cylinder which is adjustable by means of a control valve in response to the output signals from the electronic control unit. In addition to the set value which is determined via the sensor, the electronic control unit is supplied with an additional signal from a regulating unit; the additional signal being dependent on the presence of a regulating function of a locking protection control system (LPCS). Accordingly, the above-described device is designed to allow automatic actuation of the clutch in an LP control system.

Claims

1. A clutch actuation device for a vehicle comprising an actuating operative element to engage and disengage a clutch (3) in response to output signals from an electronic control unit (28), a clutch pedal (18), a first sensor (17) which determines an extent of depression of said clutch pedal (18) and sends a measurement signal whose magnitude depends on the position of said clutch pedal (18) to the electronic control unit (15), a further sensor (19), which sends another measurement signal to the electronic control unit (15) which depends on the position of a clutch actuation element (5) of said actuating operative element, said electronic control unit (15) produces an output signal depending upon a set value input associated with said first sensor (17) and by a second actual value input associated with said further sensor (19), which output signal is directed to a fluid pressure control valve (9), and said vehicle is equipped with a brake locking protection control system (LPCS) controllable via a regulating unit (28), which includes a signal transmission device which, when a brake locking protection function is present, supplies an additional signal produced in the regulating unit (28) to said electronic control unit (15) and in response thereto, said control valve 9 is switched to permit fluid flow to operate a piston of said clutch actuation element (5) which disengages said clutch (3) in which, upon simultaneous receipt of a measurement signal from said sensor (17) and an additional signal from said regulating unit (28), said electronic control unit (15) forms an output signal which is the same as it would form if only the additional signal from the regulating unit (28) were present.

2. A device as claimed in claim 1, in which said first sensor is a depression detector (17).

3. A device as claimed in claim 1, which includes a force resistance element (30) acting in opposition to a direction of depression of said clutch pedal (18).

4. A device as claimed in claim 1, in which said clutch pedal (18) is in a position of least engagement and said electronic control unit (15) supplies said same output signal as it would if only the measurement signal from said first sensor (17) were present.