Autonomous Vehicle Acceleration Compensation Between Gear Shifts
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Solution Overview
Problem
Autonomous vehicles experience acceleration loss during gear-shifts, leading to a lower average acceleration than desired, which can result in suboptimal performance in certain driving scenarios.
Innovation Solution
A computer system controls the propulsion source arrangement to compensate for acceleration loss by increasing acceleration during time periods separate from gear-shifts, using predictive and responsive methods to align vehicle behavior with desired acceleration requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission performs gear-shifts to fulfill acceleration requests, then the vehicle can operate across different speed ranges, but the average acceleration becomes lower than desired due to acceleration loss during gear-shifts
Solution Approach 1:
The system performs preliminary action by predicting upcoming gear-shift events based on current vehicle state and transmission characteristics. Before the gear-shift occurs, the control system pre-compensates by adjusting the propulsion output to account for the expected acceleration loss, thereby maintaining the desired acceleration trajectory throughout the gear-shift process
Solution Approach 2:
The system implements feedback by continuously monitoring actual acceleration during gear-shifts and comparing it with desired acceleration. Based on this feedback, the control system dynamically adjusts the propulsion output to compensate for acceleration loss, ensuring that the vehicle maintains the requested acceleration profile despite transmission gear-changes
2Measurement precision
If the vehicle accelerates at the desired rate without compensation, then the control system follows instructions accurately, but gear-shifts cause deviations from the desired acceleration profile
Solution Approach 1:
The control system performs preliminary compensation by calculating the expected acceleration loss from upcoming gear-shifts and adjusting the propulsion output in advance. This pre-action ensures that the desired acceleration profile is maintained consistently through gear-shift events without deviations
Solution Approach 2:
The system applies preliminary anti-action by counteracting the anticipated negative effect of gear-shifts (acceleration loss) before they occur. The control system generates compensatory propulsion torque that offsets the expected disruption, preventing deviations from the desired acceleration profile
Data Source
AI summary
A computer system comprising processing circuitry configured to: receive, from an autonomous drive control system, an acceleration request encoding a desired acceleration of an autonomous vehicle having a propulsion source arrangement configured to drive at least one wheel of the autonomous vehicle via a transmission including a plurality of gear-stages; and control the propulsion source arrangement in such a way that the autonomous vehicle accelerates with a greater acceleration than the desired acceleration during at least one acceleration loss compensation time period being separate from at least one gear-shift time period of at least one gear-shift required to fulfill the acceleration request.