Adaptive Engine Torque Control for Manual Transmission Clutch Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Manual transmission vehicles experience premature clutch wear due to high frictional work during engine start-up and idling, especially in high-torque and high-revolution engines with four-wheel drive, resulting in thermal overload.
Innovation Solution
A method to control engine torque by reducing the setpoint engine torque when specific criteria are met, such as low driving speed or a defined delay time, using a torque factor based on engine characteristics like speed and the quotient of engine speed and driving speed, to limit engine torque and speed, thereby reducing clutch stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine torque is limited to reduce clutch stress during start-up and idling, then clutch wear is reduced, but engine performance is compromised
Solution Approach 1:
The patent applies dynamics by making the torque limitation adaptive rather than static. The control system dynamically adjusts the engine torque based on real-time detection of vehicle motion state (acceleration, deceleration, constant speed) and gear position. During start-up and idling phases when clutch stress is highest, torque is limited; once the vehicle reaches certain speed thresholds or gear changes occur, the limitation is released. This dynamic adaptation resolves the contradiction by preserving engine performance when needed while protecting the clutch during vulnerable phases.
Solution Approach 2:
The patent implements preliminary action by proactively limiting engine torque before the clutch reaches critical thermal conditions. The control system detects early signs of high-stress scenarios (such as high engine speed combined with low vehicle speed indicating potential clutch slipping) and preemptively reduces torque output. This prevents the thermal overload from occurring in the first place, thereby protecting clutch durability without permanently compromising engine capability.
2Temperature
If the engine torque is reduced during start-up to protect the clutch, then thermal overload is avoided, but acceleration performance deteriorates
Solution Approach 1:
The patent applies periodic action through time-based and state-based torque management. The system implements different torque strategies in different temporal phases: during the initial start-up phase and idling period, torque is limited to protect the clutch; once the vehicle transitions to normal operating conditions (achieving certain speed thresholds or maintaining constant speed), the torque limitation is lifted. This periodic switching between protective and performance modes resolves the contradiction by ensuring clutch protection only when thermally vulnerable, while preserving acceleration performance when thermal risks are absent.
3Duration of action of stationary object
If a torque limitation strategy is implemented to reduce clutch wear, then clutch lifespan is extended, but driving comfort is reduced due to sudden torque changes
Solution Approach 1:
The patent uses dynamics to create smooth, adaptive torque transitions rather than abrupt limitations. The control system continuously monitors vehicle state parameters and adjusts torque output progressively based on the detected motion phase. During gear transitions or when exiting start-up mode, the torque limitation is gradually reduced rather than suddenly removed, preventing jerky movements and maintaining driving comfort. This dynamic, smooth adaptation extends clutch lifespan while preserving ease of operation.
4Object-affected harmful factors
If the engine speed is limited to reduce frictional work on the clutch, then clutch wear is minimized, but productivity is reduced
Solution Approach 1:
The patent implements preliminary action by proactively managing engine speed based on predicted clutch stress conditions. The control system detects early indicators of high-friction scenarios (such as high engine RPM combined with low vehicle speed, indicating potential clutch slipping) and preemptively reduces engine speed or torque output. This prevents excessive frictional work from occurring in the first place, thereby protecting the clutch while minimizing impact on overall vehicle productivity by only limiting power when clutch protection is needed.
Data Source
AI summary
In a motor vehicle having a manual transmission, for, in particular, limiting the engine speed during the start-up operation when fulfilling at least one permission criterion for the engine torque, the criterion depending on the driving state of the motor vehicle, a default engine torque is preset, which is specified according to at least one engine characteristic value and which can be reduced with regard to the set engine torque called for by the position of the accelerator pedal of the motor vehicle.