Engine Torque Control to Prevent Driveline Bump
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Solution Overview
Problem
Traditional engine control systems fail to accurately control engine output torque and do not provide rapid responses to control signals, leading to driveline bump when a driver depresses the accelerator pedal due to slack in the driveline and differences in engine and transmission speeds.
Innovation Solution
A system comprising a torque determination module and a torque limit module that limits engine torque to match engine speed with turbine or transmission input shaft speed when the accelerator pedal is depressed, preventing driveline bump while ensuring smooth acceleration by gradually increasing torque to avoid delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional engine control systems increase torque rapidly when the accelerator pedal is depressed, then the response speed improves, but driveline bump occurs due to slack in the driveline and speed differences between engine and transmission
Solution Approach 1:
The control system performs preliminary action by detecting accelerator pedal depression and proactively limiting torque increase before the driveline bump can occur. The system anticipates the problem by monitoring pedal position and pre-adjusting torque limits to prevent the harmful effect rather than reacting after it occurs.
Solution Approach 2:
The torque limit is made dynamic rather than fixed. The control system continuously adjusts the torque limit based on real-time operating conditions including engine speed, transmission speed, and pedal position. This dynamic adjustment allows the system to optimize between response speed and driveline bump prevention under varying conditions.
2Stability of the object's composition
If the engine torque is limited to prevent driveline bump, then the smoothness of acceleration improves, but the engine may stall due to insufficient torque
Solution Approach 1:
The control system employs feedback by continuously monitoring engine operating parameters including speed, load, and torque. This feedback loop allows the system to adjust the torque limit in real-time, ensuring that torque reduction prevents driveline bump while maintaining sufficient torque to prevent engine stall. The system responds to changing conditions dynamically.
Solution Approach 2:
The system changes torque parameters dynamically based on operating conditions. Rather than applying a fixed torque limit, the control system adjusts torque magnitude according to engine speed, transmission state, and load conditions. This parameter change strategy ensures smooth acceleration while maintaining reliability across different operating scenarios.
3Device complexity
If traditional engine control systems do not coordinate torque control among various devices, then the device complexity is reduced, but the torque control accuracy deteriorates
Solution Approach 1:
The control system merges torque control functions across multiple devices including the engine control module, transmission control module, and accelerator pedal position sensor. By coordinating these devices through a unified control strategy, the system achieves high torque control accuracy without proportionally increasing overall system complexity, as the coordination is implemented through integrated control logic.
Data Source
AI summary
A system according the principles of the present disclosure includes a torque determination module and a torque limit module. The torque determination module determines a first torque that prevents an engine from stalling. The torque limit module limits engine torque based on the first torque when a driver actuates an accelerator pedal from a first position in which the accelerator pedal is not depressed to a second position in which the accelerator pedal is depressed.