Drivetrain Protection Device for Automatic Transmission Back Rolling
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Solution Overview
Problem
Automatic transmissions in motor vehicles can suffer damage and exhibit unwanted behavior, such as backward rolling, due to hydraulic effects during uphill slopes, leading to engine shutdown and increased fuel consumption, as existing solutions like clutch activation or hill-hold devices impose additional loads on the drivetrain and delay starting processes.
Innovation Solution
A protection device comprising a sensor device to detect rolling movements counter to the selected direction of travel and a control device to manage the brake system, limiting the rolling speed to a maximum speed to prevent drivetrain damage and unwanted engine shutdown, utilizing existing brake systems to minimize additional load and wear, and integrating with the engine controller for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch is activated to prevent back rolling by increasing engine rotational speed, then the motor vehicle is brought to a halt, but the transmission is loaded and fuel consumption increases
Solution Approach 1:
The patent replaces the mechanical solution of increasing engine rotational speed and activating clutch with an electronic control system that modulates engine torque output. The control unit adjusts the torque characteristic curve to counteract the rolling force, eliminating the need for mechanical clutch engagement and excessive fuel consumption while maintaining reliability in preventing back rolling.
2Reliability
If a bypass clutch is engaged to block wheels and hold the motor vehicle, then the motor vehicle is held on slope, but the transmission is loaded and starting process is delayed
Solution Approach 1:
The patent replaces the mechanical bypass clutch system with an electronic torque control system. The control unit modulates engine torque to prevent wheel rollback, eliminating the need for mechanical clutch engagement. This allows the vehicle to be held on slopes without transmission loading and enables immediate restart without clutch disengagement delays.
3Reliability
If a brake in the transmission is used to block a portion of the transmission, then the motor vehicle is held at standstill on slope, but the transmission is loaded
Solution Approach 1:
The patent replaces the mechanical brake system within the transmission with an electronic torque control system. The control unit adjusts engine torque output to counteract gravitational forces on slopes, preventing the need for transmission braking. This eliminates additional transmission loading while maintaining the ability to hold the vehicle at standstill on slopes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents drivetrain damage and unwanted engine shutdown by limiting rolling speed, reducing wear on the brake system, and enabling fast restarts without additional transmission components, while being cost-effective and easily integrated into existing vehicle systems.
Implementation Method 1
an automatic transmission, which comprises at least one hydraulic converter
Data Source
AI summary
A protection device for a drivetrain of a motor vehicle having an engine and an automatic transmission, with at least one hydraulic converter. In order to protect the drivetrain, the protection device has a sensor device and a control device. The sensor device is designed to detect a rolling movement of the motor vehicle counter to the selected direction of travel of an engaged gearspeed of the automatic transmission, and the control device is designed to control a brake system of the motor vehicle as a function of the detected rolling movement, in order to limit a rolling speed of the motor vehicle counter to the selected direction of travel to a maximum speed.