Vehicle Acceleration Control with Differentiated Feedback Gain
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Solution Overview
Problem
Existing vehicle control systems face difficulties in properly calculating and matching the manipulated variables for motive power generation and braking systems to achieve target acceleration, leading to cumbersome and complicated processes.
Innovation Solution
A control apparatus that calculates torque based on the difference between actual and target acceleration, with differentiated gains for feedback control when using or not using brake apparatuses, and distributes torque between motive power generation and braking systems, allowing for optimal actuation and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If feedback control is performed using a single gain value for both brake usage and non-usage cases, then the control process is simplified, but the responsiveness and accuracy of acceleration control deteriorates
Solution Approach 1:
The feedback gain is made dynamic by switching between two different gain values based on the operational state (brake usage or non-usage). This allows the control system to adapt its characteristics to match the current operating conditions, improving responsiveness when brakes are not used while maintaining stability when brakes are engaged.
Solution Approach 2:
The feedback gain parameter is changed based on the operational state of the brake apparatus. By detecting whether the brake is being used and selecting appropriate gain values (first gain for brake usage, second gain for non-usage), the system optimizes acceleration control accuracy for each specific operating condition.
2Reliability
If differentiated gain values are used for brake usage and non-usage cases, then the responsiveness and accuracy of acceleration control is improved, but the device complexity increases
Solution Approach 1:
The control system dynamically switches between different gain values based on the brake usage state, allowing optimal performance for each operating condition without requiring a completely separate control system for each case.
Solution Approach 2:
The control apparatus automatically detects the brake usage state and selects the appropriate gain value without external intervention. The system self-adjusts its control parameters based on its own operational state, simplifying the overall control architecture while maintaining high accuracy.
3Speed
If the brake apparatus response delay is compensated by increasing the feedback gain, then the responsiveness is improved, but the stability deteriorates due to excessive gain during brake activation
Solution Approach 1:
The feedback gain parameter is selectively changed based on the brake usage state. A higher first gain is used when brakes are not being used to compensate for response delay, while a lower second gain is used when brakes are activated to maintain stability, avoiding the trade-off that would exist with a single fixed gain value.
Solution Approach 2:
The control system dynamically adjusts the feedback gain based on real-time brake usage detection, allowing the system to optimize both responsiveness and stability for each operational phase without compromise.
Data Source
AI summary
A control apparatus controls acceleration of a vehicle provided with a motive power generation apparatus and brake apparatuses. For the control, the control apparatus comprises calculation and actuating blocks. The calculation block calculates torque to be requested, based on a difference between an actual value of the acceleration and a target value thereof and a gain for feedback controlling the actual value of the acceleration to the target value thereof. The gain is differentiated in value between in a first case in which the brake apparatuses are used for the feedback control and a second case in which the brake apparatuses are not used for the feedback control. The actuating block actuates the motive power generation apparatus and the brake apparatuses based on the calculated torque. The value of the gain in the first case is made larger than the value of the gain in the second case.