Vehicle Torque Control for Shock Suppression
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Solution Overview
Problem
Existing vehicle control systems that adjust the relative rotational angle between input and output shafts to suppress shock may not effectively prevent shock occurrence due to delayed acceleration/deceleration control, especially when engine rotation speed is high, as the control is initiated only after the absolute value of the relative rotational angle exceeds a threshold, leading to incomplete shock suppression.
Innovation Solution
Implementing a driving source torque controller that detects the driving source torque to initiate shock suppression control before the predetermined relative rotational angle is reached, by controlling the driving source torque to reduce the absolute value of relative speed or transmission torque between power transmission members when backlash is eliminated, thereby anticipating and mitigating shock occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration/deceleration control is initiated only after the absolute value of the relative rotational angle exceeds a threshold, then the control system can detect backlash elimination, but the shock suppression becomes delayed and ineffective at high engine rotation speeds
Solution Approach 1:
The control system initiates shock suppression control before the relative rotational angle reaches the threshold value that indicates backlash elimination. By detecting the tendency of the relative rotational angle to exceed the threshold and acting in advance, the system reduces relative speed or transmission torque proactively, preventing shock occurrence rather than reacting after detection
Solution Approach 2:
The control system applies counter-measures (reducing driving source torque, reducing relative speed, or reducing transmission torque) before the harmful effect (shock) actually occurs. By anticipating the condition that leads to shock and applying opposing force in advance, the system prevents the harmful vibration from manifesting
2Reliability
If the control system waits for the relative rotational angle to exceed a threshold before initiating shock suppression, then it can confirm backlash elimination, but the shock already occurs by the time control activates
Solution Approach 1:
The control system monitors the relative rotational angle and initiates shock suppression control when the angle approaches but has not yet exceeded the threshold. This preliminary action ensures control activation occurs before backlash elimination and shock occurrence, making the shock suppression effective rather than delayed
Solution Approach 2:
The control system continuously monitors the relative rotational angle between power transmission members and uses this feedback to determine when to initiate shock suppression control. By comparing the real-time angle against the threshold and acting on the tendency to exceed it, the system achieves timely and reliable shock suppression
Data Source
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AI summary
When controlling a driving source torque in order to accelerate a driving wheel (3), a driving source torque controller (91) performs shock suppression control of controlling the driving source torque based on an acquired driving source torque so that at least one of (i) an absolute value of relative speed between power transmission members (61) and (62) on a power transmission path (60p) decreases, when backlash (G1) between the power transmission members (61) and (62) decreases, or (ii) a transmission torque which is transmitted between the power transmission members (61) and (62) on the power transmission path (60p) decreases, when the backlash (G1) between the power transmission members (61 and (62) is eliminated.