Automated transmission systems
First Claim
1. An automated transmission for a vehicle comprising a multi-ratio gear box connected to an engine by means of a transmission clutch, a transmission brake acting on a component of the transmission between the transmission clutch and the driven wheels of the vehicle, an electronic control unit, means for sensing actuation of the transmission brake and sending a signal indicative thereof to the control unit, means for sensing the engine torque and sending a signal indicative thereof to the control unit, means for sensing the vehicle speed and sending a signal indicative thereof to the control unit, means for sensing whether a gear downshift is requested or in operation and sending a signal indicative thereof to the control unit, and means for sensing whether an operating brake of the vehicle is applied and sending a signal indicative thereof to the control unit;
- characterized in that the control unit controls operation of the transmission brake to apply a braking torque to the transmission, if the engine torque is negative, the vehicle speed is above a predetermined value, a gear downshift has been requested or is in progress and the operational brakes of the vehicle are not applied.
6 Assignments
0 Petitions
Accused Products
Abstract
An automated transmission system includes a transmission brake which is used to apply a braking torque to the transmission, while the engine torque is negative and a transmission clutch is disengaged to effect a gear downshift, in order to avoid acceleration of the vehicle when the clutch is released and abrupt deceleration of the vehicle upon completion of the gear downshift.
11 Citations
18 Claims
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1. An automated transmission for a vehicle comprising a multi-ratio gear box connected to an engine by means of a transmission clutch, a transmission brake acting on a component of the transmission between the transmission clutch and the driven wheels of the vehicle, an electronic control unit, means for sensing actuation of the transmission brake and sending a signal indicative thereof to the control unit, means for sensing the engine torque and sending a signal indicative thereof to the control unit, means for sensing the vehicle speed and sending a signal indicative thereof to the control unit, means for sensing whether a gear downshift is requested or in operation and sending a signal indicative thereof to the control unit, and means for sensing whether an operating brake of the vehicle is applied and sending a signal indicative thereof to the control unit;
- characterized in that the control unit controls operation of the transmission brake to apply a braking torque to the transmission, if the engine torque is negative, the vehicle speed is above a predetermined value, a gear downshift has been requested or is in progress and the operational brakes of the vehicle are not applied.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification