Engine Torque Control for Power Train Vibration Suppression
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Solution Overview
Problem
Existing engine control systems fail to effectively suppress vibration caused by the rolling movement of the power train during vehicle acceleration, while maintaining acceleration performance, as they do not adequately consider the rolling movement in their torque control strategies.
Innovation Solution
An engine control device that includes an engine speed acquiring unit, an accelerator actuated amount acquiring unit, and a torque controlling unit, which limits the increase in engine torque to control the initial speed of the rolling movement of the power train, using angular speed, angular acceleration, and angular jerk calculations to determine the optimal timing for starting and ending torque control, thereby suppressing vibration and maintaining acceleration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If engine torque is increased abruptly to improve acceleration performance, then acceleration performance is improved, but vibration occurs in the vehicle
Solution Approach 1:
The patent applies dynamics by making the engine torque increase rate variable rather than fixed. The control device dynamically adjusts the torque increase rate based on real-time detection of power train rolling movement, allowing the system to optimize between acceleration performance and vibration suppression under different operating conditions
Solution Approach 2:
The patent implements feedback control by detecting the rolling movement of the power train and using this information to adjust the engine torque increase rate. The acceleration sensor detects rolling acceleration, and this feedback signal is used by the control device to modulate torque delivery, creating a closed-loop control system that suppresses vibration while maintaining acceleration capability
2Object-affected harmful factors
If engine torque is increased slowly to suppress vehicle vibration, then vehicle vibration is suppressed, but acceleration performance deteriorates
Solution Approach 1:
The system dynamically adjusts the torque increase rate based on detected rolling movement characteristics. When rolling movement is detected, the torque increase rate is reduced to suppress vibration; when rolling movement is suppressed, the torque increase rate can be increased to improve acceleration performance, creating a dynamic balance between the two competing objectives
3Loss of time
If engine torque is increased abruptly at the start of acceleration, then acceleration response is improved, but rolling movement of the power train increases causing vibration
Solution Approach 1:
The patent applies preliminary action by detecting the start of rolling movement before it fully develops and causing vibration. The acceleration sensor detects early rolling acceleration, and the control device preemptively adjusts the torque increase rate to prevent excessive rolling movement from developing, thereby maintaining acceleration response while preventing vibration
Solution Approach 2:
Real-time feedback from the acceleration sensor allows the control device to detect and respond to rolling movement at its inception. The feedback loop continuously monitors rolling acceleration and adjusts torque delivery to suppress rolling movement while maintaining acceleration response
Data Source
AI summary
A PCM (60) as an engine control device comprises a torque controlling unit (65) configured to control an engine torque based on an accelerator actuated amount. The torque controlling unit (65) is configured, after the accelerator actuated amount is started to increase, and when a power train (PT) which includes at least an engine (E) fixed to a vehicle body by an engine mount (Mt) is started to conduct the rolling movement, to control to limit increase in the engine torque so as to make an actual increase rate of the engine torque smaller than a nominal increase rate of the engine torque according to an increase in the accelerator actuated amount, in order to control an initial speed of the rolling movement.