Remote Vehicle Speed Control via Steering Angle Correction
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Solution Overview
Problem
Remote vehicle operation systems face challenges in maintaining smooth control due to the operator's inability to directly feel changes in vehicle speed and acceleration, leading to abrupt accelerations or decelerations, and delays in recognizing changes in the vehicle's condition, which can result in poor operability and increased risk of accidents.
Innovation Solution
The system incorporates a communication circuit, steering angle sensor, and speed sensor, with a processor that corrects the accelerator input value based on the steering angle and speed, reducing the speed when the steering angle is significant and the vehicle is moving, and adjusts for delay times to improve control precision and reduce abrupt changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator remotely controls the vehicle using wireless communication, then the operator can steer the vehicle from a remote location, but the operator cannot directly feel changes in vehicle speed and acceleration, leading to abrupt accelerations or decelerations
Solution Approach 1:
The system provides visual feedback through a monitor displaying real-time video from the vehicle's camera, allowing the operator to observe the vehicle's movement and surrounding environment. This visual feedback compensates for the lack of tactile feedback from remote operation, enabling the operator to make smoother control decisions by observing the actual vehicle response and adjusting inputs accordingly.
Solution Approach 2:
The system changes the feedback parameter from tactile (which is unavailable in remote operation) to visual through the monitor display. By presenting visual information about vehicle speed, acceleration, and surrounding conditions, the system enables the operator to perceive vehicle state changes that would otherwise be felt through touch, thereby improving control smoothness.
2Loss of information
If the operator relies on visual information from sensors and communication means, then the operator can monitor the vehicle condition remotely, but delays in recognizing changes in the vehicle's condition occur, resulting in poor operability
Solution Approach 1:
The system performs preliminary processing of sensor data on the vehicle itself, calculating derived parameters such as acceleration and speed changes before transmitting them to the operator. This preliminary action reduces the computational and transmission time needed for the operator to understand vehicle state changes, enabling faster response without losing monitoring capability.
Solution Approach 2:
The system replaces direct mechanical/tactile sensing with electronic sensor arrays and digital signal processing. Multiple sensors (camera, radar, other detectors) substitute for single-point mechanical feedback, providing comprehensive vehicle state information that is processed and transmitted electronically, reducing the time lag between actual vehicle conditions and operator awareness.
3Reliability
If the vehicle speed is reduced during steering operations, then the vehicle can turn more safely, but the overall operational efficiency decreases
Solution Approach 1:
The system dynamically adjusts vehicle speed based on real-time steering angle and operational context. When large steering inputs are detected, the system automatically reduces speed to ensure safe turning. When steering angles are small or the vehicle is traveling straight, the system maintains higher speeds for improved efficiency. This dynamic adaptation resolves the contradiction between safety and productivity.
Solution Approach 2:
The system performs preliminary speed adjustment automatically before the operator completes a steering maneuver. By detecting the steering input and pre-reducing speed in anticipation of the turn, the system ensures safe turning conditions are already in place before the vehicle begins to turn, eliminating the need for abrupt mid-maneuver speed changes that would reduce efficiency.
Data Source
AI summary
A vehicle that is remotely operable by an operator is provided. The vehicle includes a communication circuit that receives a vehicle operation signal including an accelerator input value based on a first operation performed by the operator, a steering angle sensor that measures a steering angle of the vehicle, a speed sensor that measures a speed of the vehicle, and a processor. The processor corrects the accelerator input value such that when the absolute value of an angular measure of the steering angle is greater than or equal to a predetermined angular measure and the speed is greater than zero, the accelerator input value is corrected so as to reduce the speed to a value that is less than when the absolute value of the angular measure of the steering angle is less than the first predetermined angular measure and the speed is greater than zero.