Vehicle Dynamics Control Unit Slip Corridor Strategy
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Solution Overview
Problem
Current vehicle dynamics control systems face limitations in reaction speed and comfort due to the complexity of the controlled systems and latency in drive control units, particularly with electric drive motors, leading to unsatisfactory control quality and high material stress.
Innovation Solution
The vehicle dynamics control system shifts the slip controller from the electronic control unit to the drive control unit, changing the interface from torque to speed, allowing the drive control unit to independently decide on control actions and specifying target slip corridors instead of torque values, which enables faster correction of slip deviations and improved comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the slip controller remains in the electronic control unit with torque-based control, then the control system structure is maintained, but the reaction speed is slow and control quality is unsatisfactory
Solution Approach 1:
The slip control function is extracted from the electronic control unit and transferred to the drive control unit. This extraction enables the drive control unit to independently execute slip control decisions, eliminating the latency associated with centralized control processing and thereby improving reaction speed.
Solution Approach 2:
The drive control unit is empowered to make its own slip control decisions by receiving target slip values from the electronic control unit and autonomously determining control actions. This self-service capability eliminates waiting time for centralized control commands and improves response speed.
2Reliability
If torque-based control is used, then the control interface is simple, but the control quality is unsatisfactory and material stress is high
Solution Approach 1:
The control interface parameter is changed from torque to target slip value. This parameter change allows the drive control unit to optimize control actions based on actual drive conditions, improving control quality and reducing unnecessary material stress by enabling more precise and adaptive control.
3Speed
If the interface changes from torque to speed, then the reaction speed improves, but the control interface complexity increases
Solution Approach 1:
The target slip value acts as an intermediary parameter between the electronic control unit and the drive control unit. Instead of directly controlling torque, the system uses target slip values to guide the drive control unit's decisions, simplifying the interface while enabling faster and more adaptive control responses.
Data Source
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AI summary
The drive dynamic regulating system according to the invention has an electronic drive dynamic control unit which is connected to at least one drive control unit and is designed to first ascertain a target slip or a target slip corridor and the actual vehicle speed as a reference speed. The target slip corridor is preferably specified by a minimally permissible target slip for the thrust operation and a maximally permissible target slip for the traction operation in the respective current driving situation. According to a first alternative, a target rotational speed or a target rotational speed corridor is output to the at least one drive control unit in accordance with the target slip or the target slip corridor. The rotational speed corridor according to the first alternative is thus calculated from a maximally permissible drive and deceleration slip in the driving situation. According to a second alternative, the target slip together with the reference vehicle speed is directly output to the at least one drive control unit, and the drive control unit itself ascertains a target rotational speed at the engine level therefrom. In the second alternative, a target slip corridor can also be output instead of a target slip value analogously to the first alternative, said target slip corridor being converted into a target rotational speed corridor by the drive control unit.