Motor Vehicle Kinematic Control Using Setpoint Variation Feedforward
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Solution Overview
Problem
Current methods for regulating kinematic variables of motor vehicles do not efficiently account for the variation of setpoint values over time, leading to suboptimal controller stability and asymptotic adjustment behavior, and increased interference and noise in actuating variables.
Innovation Solution
A method that incorporates the variation of setpoint values over time as an additional contribution to the actuating variable, utilizing a combination of proportional, integral, and differential control components to efficiently regulate kinematic variables, such as velocity and acceleration, without increasing noise amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the variation of setpoint value over time is taken into account as an additional contribution to the actuating variable, then the second-order setpoint value subsequent behavior (curvature behavior) is efficiently improved, but the device complexity increases due to additional calculation requirements
Solution Approach 1:
The patent calculates the variation of the setpoint value over time in advance and incorporates it as an additional contribution to the actuating variable. This preliminary action improves the controller's ability to handle setpoint changes efficiently, enhancing stability without requiring complex real-time adjustments during operation.
2Measurement precision
If the actual value of the control variable is incorporated into the calculation of the additional component, then the control precision may be improved, but the interference and noise amplitudes on the actuating variable increase
Solution Approach 1:
The patent extracts the calculation of the additional component from the actual control loop by using only the setpoint value and its variation over time, excluding the actual control variable. This separation prevents noise and interference from the actual value measurements from being amplified in the actuating variable calculation.
3Productivity
If multiple kinematic variables are regulated simultaneously, then the overall vehicle control performance is improved, but the device complexity increases due to multiple partial actuating variables
Solution Approach 1:
The patent combines multiple partial actuating variables into a single integrated actuating variable through systematic addition. This merging approach maintains comprehensive control over multiple kinematic variables while simplifying the overall control structure and reducing the complexity of individual control components.
Data Source
AI summary
A method for regulating a kinematic variable of a motor vehicle. The method includes: receiving actual value signals, which represent an actual value of a kinematic variable of a motor vehicle; receiving setpoint signals, which represent a setpoint value of the kinematic variable; ascertaining an actuating variable to be implemented by one or multiple actuating element(s) of the motor vehicle, based on the actual value, the setpoint value and a variation of the setpoint value over time in such a way that a deviation between the actual value and the setpoint value becomes smaller when the actuating variable is implemented with the aid of the one or multiple actuating element(s); and outputting actuating variable signals, which represent the ascertained actuating variable. A device, a computer program, and a machine-readable memory medium are also described.