Vehicle Driveline Torque Deactivation Method
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Solution Overview
Problem
Existing motor vehicle systems experience discomforting shocks and jerks due to sudden torque changes, particularly when the curative comfort function is deactivated, leading to torque jumps that can cause inconvenience to passengers.
Innovation Solution
A method to deactivate the curative comfort function by applying a decrement factor that gradually decreases from 1 to 0, multiplying it by the theoretical corrective torque to generate a final torque that remains in phase with the natural frequencies of the traction chain, thereby avoiding sudden torque changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the curative comfort function is deactivated abruptly, then the control system returns to normal operation, but torque jumps and oscillations are generated causing passenger discomfort
Solution Approach 1:
The patent applies dynamics by transitioning the curative comfort function deactivation from an abrupt static change to a dynamic progressive process. The function is deactivated gradually over multiple engine cycles rather than instantaneously, allowing the corrective torque to decrease smoothly and avoid torque jumps that cause oscillations and passenger discomfort.
Solution Approach 2:
The patent employs periodic action by deactivating the curative comfort function over a defined number of engine cycles (e.g., 5-10 cycles). This periodic approach allows the corrective torque to be reduced in controlled increments synchronized with the engine's natural cycle, preventing sudden torque changes while maintaining system stability throughout the transition.
2Object-affected harmful factors
If the corrective torque is reduced gradually over multiple engine cycles, then torque jumps are avoided, but the deactivation process takes longer
Solution Approach 1:
The patent applies parameter changes by modifying the corrective torque parameter progressively rather than maintaining a fixed abrupt deactivation. The corrective torque is reduced in controlled increments over multiple engine cycles, changing the torque parameter dynamically to avoid jumps while keeping the overall deactivation time within acceptable limits (typically 5-10 engine cycles).
Data Source
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AI summary
Method for deactivating a curative driveability function which influences the control of a motor vehicle driveline, this function, during a rapid change in engine torque setpoint, limiting the engine speed fluctuations by generating a corrective torque that combines with this torque setpoint, characterized in that, during a demand to deactivate the curative driveability function, a decrement factor decreasing from one to zero is established and then multiplied by the theoretical corrective torque needed which continues to be calculated in the normal way by this function in order to obtain the final corrective torque which is combined with the torque setpoint.