Vehicle Acceleration Control Under Load and Uphill Constraints
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Solution Overview
Problem
Existing vehicle acceleration control methods fail to effectively manage the difference between target and actual acceleration, leading to issues with fuel efficiency and ride comfort, especially when the vehicle's acceleration performance is compromised by load or terrain.
Innovation Solution
A vehicle system that includes a sensor unit to measure current acceleration and a controller to derive a final target acceleration value by considering the surrounding environment and acceleration performance, using a weighted first acceleration value and a predetermined limit value to determine a second acceleration value, which is then compared with the target acceleration value to set the final target acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine control output is rapidly increased to achieve target acceleration when vehicle acceleration capability is insufficient, then the target acceleration can be reached faster, but fuel efficiency deteriorates and ride comfort is compromised
Solution Approach 1:
The patent applies dynamics by making the target acceleration value adjustable based on vehicle operating conditions. The acceleration controller dynamically modifies the target acceleration value according to vehicle speed, engine load, and other operational parameters, allowing the system to optimize between rapid acceleration response and fuel efficiency depending on the current driving context
Solution Approach 2:
The patent changes the parameter of target acceleration value based on vehicle operating conditions. By adjusting the target acceleration value according to vehicle speed, engine load, and driving mode, the system optimizes the balance between acceleration performance and fuel consumption, preventing excessive fuel use during acceleration while maintaining acceptable acceleration capability
2Speed
If the engine control output is rapidly increased to bridge the gap between target and actual acceleration, then acceleration performance improves, but ride comfort deteriorates due to abrupt acceleration changes
Solution Approach 1:
The acceleration controller dynamically adjusts the target acceleration value based on real-time vehicle operating conditions including current acceleration, vehicle speed, and engine load. This dynamic adjustment prevents abrupt acceleration changes that would compromise ride comfort while maintaining adequate acceleration performance
Solution Approach 2:
The system uses feedback from the acceleration sensor and other vehicle state sensors to continuously monitor actual acceleration and compare it with the target acceleration value. The acceleration controller uses this feedback to smoothly adjust engine control output, preventing abrupt changes that would degrade ride comfort while achieving the desired acceleration performance
3Device complexity
If a fixed target acceleration value is used without considering vehicle acceleration capability, then the control algorithm is simpler, but the acceleration control accuracy deteriorates when vehicle performance varies with load and terrain
Solution Approach 1:
The patent implements a dynamic target acceleration value that adapts to varying vehicle operating conditions including load capacity and terrain. The acceleration controller modifies the target acceleration value based on real-time sensor data, ensuring accurate acceleration control across different driving scenarios without requiring overly complex control algorithms
Solution Approach 2:
The system changes the target acceleration parameter based on vehicle operating conditions such as vehicle speed, engine load, and acceleration requests. This parameter adaptation maintains high acceleration control accuracy across varying vehicle performance conditions while keeping the control algorithm computationally manageable through structured calculation methods
Data Source
AI summary
An embodiment vehicle includes a sensor configured to measure a current acceleration of the vehicle and a controller configured to derive a target acceleration value based on a surrounding environment of the vehicle, derive a first acceleration value based on an acceleration performance of the vehicle, determine a second acceleration value based on a predetermined limit value and the first acceleration value, determine a final target acceleration value based on the target acceleration value and the second acceleration value, and cause the current acceleration of the vehicle to be changed based on the final target acceleration value.