Control device and method for controlling a vehicle powertrain during engine braking
The method and control device for activating service brakes during engine braking prevent transmission upshifts by reducing engine speed, maintaining optimal braking torque and preventing wear, thus enhancing engine braking efficiency.
DE102021106532B4Active Publication Date: 2026-01-15SCANIA CV AB
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Patent Information
- Application Number
- DE102021106532
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2020-04-29
- Filing Date
- 2021-03-17
- Publication Date
- 2026-01-15
- Estimated Expiration
- 2041-03-17
AI Technical Summary
Technical Problem
Existing engine braking systems in vehicles experience a loss of braking torque due to transmission upshifts, leading to inefficient speed control and potential engine damage during downhill travel.
Method used
A method and control device that activates service brakes to prevent transmission upshifts by reducing engine speed when it approaches a threshold, using a preselected value to maintain desired braking torque without excessive brake wear.
Benefits of technology
Maintains optimal braking torque and prevents transmission upshifts, ensuring efficient engine braking without significant brake wear, allowing for precise speed control during downhill travel.
✦ Generated by Eureka AI based on patent content.
Abstract
Method (200) for controlling a vehicle powertrain (2) during engine braking, performed by a control device (100), wherein the vehicle powertrain (2) comprises: an internal combustion engine (3), a transmission (4) configured to selectively transmit drive torque from the internal combustion engine to drive wheels (7), and Service brakes (10) configured to brake the drive wheels (7); the procedure includes the following step: Activation (S107) of the service brakes (10) for the purpose of reducing the speed of the internal combustion engine (3) when the speed of the internal combustion engine (3) approaches a threshold value (v th ) to shift up the transmission (4), and wherein the step of activating (S107) the service brakes (10) is carried out based on a determination that the acceleration of a vehicle (1) comprising the vehicle powertrain (2) is below a preselected value.
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