Hill Start Assist Control Stabilizing Acceleration Sensor Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hill start assistant control systems fail to accurately recognize hills after a vehicle suddenly stops, leading to potential vehicle pushback due to incorrect interpretation of pitching motion, resulting in inconsistent operation.
Innovation Solution
A control method that determines vehicle stoppage and stabilization of acceleration sensor output values by accumulating and averaging sensor data, comparing it to a reference value to ensure accurate hill recognition and operation of the hill start assistant control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hill start assistant control system uses acceleration sensor output values immediately after sudden stop, then the system responds quickly, but the hill recognition becomes inaccurate due to pitching motion
Solution Approach 1:
The system performs preliminary stabilization of acceleration sensor output values by accumulating and averaging multiple readings before making hill recognition decisions. This preliminary action filters out transient pitching motion effects that occur immediately after sudden stop, ensuring accurate hill recognition only after the vehicle posture has stabilized.
Solution Approach 2:
The patent introduces an intermediary processing mechanism (accumulation and averaging of acceleration sensor values) between the raw sensor input and the hill recognition decision. This intermediary step acts as a buffer that eliminates the direct impact of transient pitching motion on hill recognition accuracy.
2Measurement precision
If the system waits for acceleration sensor output to stabilize before operation, then hill recognition accuracy improves, but system response time increases
Solution Approach 1:
The system performs preliminary stabilization of acceleration sensor output values by accumulating and averaging multiple readings before making hill recognition decisions. This preliminary action filters out transient pitching motion effects that occur immediately after sudden stop, ensuring accurate hill recognition only after the vehicle posture has stabilized.
3Productivity
If the hill start assistant control system operates immediately after sudden stop, then system productivity is high, but operation reliability decreases due to pitching motion errors
Solution Approach 1:
The patent uses multiple temporary accumulation counts of acceleration sensor values that are discarded and renewed after each stabilization period. This approach allows the system to quickly assess current vehicle posture conditions without being influenced by previous transient states, ensuring reliable hill recognition while maintaining operational efficiency.
Data Source
AI summary
A control method for a hill start assistant control system may include determining that the vehicle is stopped and braked; receiving a current sensing value from an acceleration sensor on the vehicle which senses acceleration and periodically outputs a sensing value with the vehicle stopped and braked; determining whether a condition for stabilizing an output of the acceleration sensor is satisfied, using the current sensing value and a previous sensing value; finding an acceleration accumulation average by accumulating the current sensing value and averaging sensing values of the acceleration sensor which are accumulated up to a current time when the condition for stabilizing the output of the acceleration sensor is not satisfied; comparing the acceleration accumulation average with an accumulation reference value; and operating the hill start assistant control system, when the acceleration accumulation average is larger than the acceleration reference value.