Vehicle Starting Control Using Distance-Based Shift-Speed Adjustment
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Solution Overview
Problem
Conventional vehicle starting control systems fail to differentiate engine torque and shift-speed based on the distance from a previous vehicle, leading to unsatisfactory acceleration on congested or non-congested roads.
Innovation Solution
A system and method that utilize sensors to detect vehicle speed, accelerator pedal position, brake pedal status, distance from a previous vehicle, and time to adjust starting patterns, controlling engine torque and shift-speed using different torque filters and maps based on predetermined distance thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a predetermined shift-speed (second forward speed) is used for starting control, then smooth shift is achieved, but acceleration performance deteriorates on non-congested roads
Solution Approach 1:
The patent applies dynamics by making the shift-speed variable rather than fixed. The controller dynamically adjusts the shift-speed based on detected distance from a previous vehicle: using a first shift-speed for congested roads and a second shift-speed for non-congested roads. This dynamic adjustment resolves the contradiction by adapting the system behavior to different operating conditions.
Solution Approach 2:
The patent changes the parameter of shift-speed based on the distance from a previous vehicle. When the distance is below a threshold indicating congestion, a first shift-speed is applied; when the distance exceeds the threshold, a second shift-speed is applied. This parameter change allows the system to optimize both smooth shift and acceleration performance depending on road conditions.
2Speed
If a predetermined shift-speed (first forward speed) is used for starting control, then quick acceleration is achieved, but driver satisfaction deteriorates due to sudden acceleration on congested roads
Solution Approach 1:
The system dynamically adjusts shift-speed based on real-time detection of distance from a previous vehicle. For congested roads (distance below threshold), the system uses a first shift-speed that provides quick acceleration. For non-congested roads (distance above threshold), it switches to a second shift-speed that provides smoother acceleration, thereby maintaining driver satisfaction while preserving acceleration capability when needed.
Solution Approach 2:
The shift-speed parameter is changed based on the detected distance from a previous vehicle. The controller compares the detected distance with a predetermined threshold and adjusts the shift-speed parameter accordingly: first shift-speed for congested conditions, second shift-speed for non-congested conditions. This resolves the contradiction between acceleration performance and driver satisfaction.
3Device complexity
If conventional starting control is used without distance differentiation, then system complexity is reduced, but starting performance deteriorates on different road states
Solution Approach 1:
The system uses a distance sensor to automatically detect the distance from a previous vehicle and autonomously determines the appropriate starting pattern without requiring manual driver input. The controller self-adjusts the shift-speed and torque filter based on the detected distance, enabling the system to optimize starting performance for different road states while maintaining relatively simple operation for the driver.
Solution Approach 2:
The starting control system is designed to perform multiple functions by adapting to different road states. It can operate in congested mode (first starting pattern) or non-congested mode (second starting pattern) based on distance detection, making a single system capable of handling diverse starting scenarios optimally without requiring separate control systems for each condition.
Data Source
AI summary
A system of controlling starting of a vehicle may include a vehicle speed sensor detecting vehicle speed, an accelerator pedal position sensor detecting position of an accelerator pedal, a brake pedal position sensor detecting when a brake pedal may be operated or not, a distance sensor detecting a distance from a previous vehicle, a timer detecting time lapse from particular time, and a controller electrically connected to the vehicle speed sensor, the accelerator pedal position sensor, the brake pedal position sensor, the distance sensor and the timer, and adapted to change starting pattern according to the distance from the previous vehicle and to perform starting control according to the changed starting pattern when the vehicle may be started in a stopped state.