Single-Pedal Vehicle Control for Consistent Deceleration Torque
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Solution Overview
Problem
Motor vehicle users experience discomfort due to variations in actual deceleration caused by disturbance variables such as road grades, wind, and payload, which affect the predefined deceleration torque when using single-pedal function actuating elements.
Innovation Solution
A method that monitors disturbance variables and adjusts the deceleration torque by multiplying the predefined torque with a factor correlated to the detected variables, using sensors and control units to activate electric motors and the driving machine to compensate for these influences, ensuring consistent deceleration without altering the actuating element's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predefined deceleration torque is applied when the actuating element is in the deceleration range, then the motor vehicle decelerates, but the actual deceleration varies due to disturbance variables (road grades, wind, payload) causing user discomfort
Solution Approach 1:
The control unit continuously monitors the actual deceleration of the motor vehicle and compares it with the desired deceleration. Based on this feedback, the control unit adjusts the deceleration torque in real-time to compensate for disturbance variables such as road grades, wind, and payload changes, thereby maintaining consistent deceleration and improving driving comfort
Solution Approach 2:
The control unit dynamically changes the deceleration torque parameter based on detected disturbance variables. By adjusting the torque magnitude in response to varying conditions (e.g., increasing torque when going uphill, decreasing when going downhill), the system maintains reliable and comfortable deceleration performance
2Ease of operation
If the deceleration torque is changed to compensate for disturbance variables, then driving comfort is improved, but the system complexity increases due to additional monitoring and adjustment mechanisms
Solution Approach 1:
The control unit performs multiple functions: it monitors the position of the actuating element, determines whether the vehicle is in acceleration or deceleration range, monitors disturbance variables, and adjusts the deceleration torque. By consolidating these functions in a single control unit, the system achieves improved driving comfort without proportionally increasing overall system complexity
Solution Approach 2:
The control system automatically detects disturbance variables and adjusts the deceleration torque without requiring manual intervention from the user. The system self-regulates to maintain comfortable deceleration, eliminating the need for additional user actions or complex manual adjustment mechanisms
Data Source
AI summary
A method for operating a motor vehicle including an actuating element which is, in particular steplessly, displaceable between a first end position and a second end position. An instantaneous position of the actuating element is monitored. A deceleration torque being predefined for the motor vehicle when the instantaneous position is in a deceleration range situated between the first end position and a predefinable change position, and an acceleration torque being predefined for the motor vehicle when the instantaneous position is in an acceleration range situated between the second end position and the change position. A monitoring is carried out for the occurrence of at least one disturbance variable which influences an actual deceleration of the motor vehicle effectuated by the deceleration torque, the deceleration torque being changed as a function of a detected disturbance variable.