Hybrid Vehicle Traveling Direction Calibration
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Solution Overview
Problem
Hybrid vehicles with transmissions lacking a reverse gear face challenges in determining the traveling direction when the motor speed sensor malfunctions, leading to abnormal acceleration phenomena due to misrecognition of the vehicle's direction.
Innovation Solution
A method and system for calibrating the traveling direction by calculating differences in moving distances based on sensor information and output torque, reversing the recognized direction when an absolute error threshold is exceeded, and controlling the powertrain according to the transmission lever state to prevent damage and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a transmission without a reverse gear is used to improve fuel efficiency and simplify structure, then the vehicle cannot determine traveling direction accurately when the motor speed sensor malfunctions, leading to abnormal acceleration
Solution Approach 1:
The patent introduces alternative intermediary methods to determine traveling direction when the primary speed sensor fails. These include using the relationship between output torque and vehicle speed, or comparing moving distances calculated from different sensors, to infer the correct traveling direction without relying on the malfunctioning motor speed sensor.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring multiple parameters (output torque, vehicle speed, moving distance) and comparing them to detect inconsistencies. When the calculated moving distance based on torque-speed relationship deviates from the sensor-based moving distance, the system triggers calibration to correct the traveling direction recognition, ensuring reliable operation even with sensor abnormalities.
2Productivity
If the motor speed sensor malfunctions, then the vehicle can still operate, but the traveling direction cannot be determined accurately causing abnormal acceleration phenomena
Solution Approach 1:
The patent creates alternative methods to copy or replicate the traveling direction information when the primary sensor fails. By calculating moving distance through multiple independent methods (sensor-based and torque-speed relationship-based), the system can cross-validate and determine the correct traveling direction even without reliable speed sensor data.
Solution Approach 2:
The system changes the parameters used for traveling direction determination when the speed sensor malfunctions. Instead of relying solely on speed sensor signals, it switches to using output torque and vehicle speed relationships, or compares multiple moving distance calculations, thereby maintaining measurement accuracy through parameter substitution and cross-validation.
3Object-affected harmful factors
If the traveling direction is misrecognized due to sensor abnormality, then the vehicle may operate abnormally, but powertrain damage can be prevented through calibration
Solution Approach 1:
The patent implements preliminary calibration actions to prevent powertrain damage before it occurs. By continuously monitoring the consistency between different moving distance calculations and detecting sensor abnormalities early, the system proactively triggers traveling direction calibration to correct misrecognition before it leads to harmful abnormal acceleration or powertrain damage.
Data Source
AI summary
A hybrid vehicle and a method of calibrating a traveling direction of the hybrid vehicle are disclosed. The method of calibrating a traveling direction of a hybrid vehicle including a transmission not having a reverse gear includes: when an abnormality of a motor speed sensor is detected, calculating a difference between at least one of a first moving distance calculated based on sensor information during a predetermined time or a second moving distance calculated based on output torque and a third moving distance calculated based on a vehicle speed by a controller for controlling output torque; when an absolute value of the calculated difference is greater than a preset error reference, reversing the traveling direction recognized by the controller; and controlling a powertrain in response to a transmission lever state.