Hybrid Vehicle Control Device Offset Calibration
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Solution Overview
Problem
Conventional control devices for hybrid vehicles require complex processes and specialized equipment to obtain updated offset amounts after replacing or repairing motor or rotational position detector components, often causing noise that discomforts users during the procedure.
Innovation Solution
A control device that determines when to obtain offset amounts while the engine is running, minimizing noise recognition by users, by starting the engine if necessary, and performing the procedure during vehicle stops to accurately determine the offset differences between detected and actual rotational positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the offset amount is obtained using conventional methods with external force application devices, then the offset amount can be accurately obtained, but the process becomes complex and requires specialized equipment and specific locations
Solution Approach 1:
The invention extracts the offset amount acquisition function from the complex conventional setup (external force application devices, specialized equipment) and integrates it into the vehicle's existing control system. The control device uses the vehicle's own operational states (engine running, vehicle stopping) to perform offset measurement without external equipment.
Solution Approach 2:
The vehicle's control device performs the offset amount acquisition using its own internal resources - the engine's operation and the vehicle's stopping state provide the necessary conditions for measurement. No external service equipment is needed; the system serves itself by utilizing its operational states for calibration.
2Ease of operation
If the offset amount is obtained when the vehicle stops without engine operation, then the procedure can be performed during normal stops, but noise from motor operation causes discomfort to users
Solution Approach 1:
The invention changes the operational parameters during offset acquisition - specifically, the engine is run at a predetermined rotational speed to generate noise that masks the motor operation noise. This parameter change (engine operation) transforms the acoustic environment to eliminate user discomfort while maintaining measurement accuracy.
Solution Approach 2:
The invention converts the potential harm of motor operation noise (which causes user discomfort) into a benefit by simultaneously operating the engine. The engine noise serves to mask the motor noise, turning what would be a harmful acoustic environment into an acceptable one for users during the calibration process.
3Object-affected harmful factors
If the engine is started to mask noise during offset acquisition, then user discomfort is reduced, but additional energy consumption and operational complexity occur
Solution Approach 1:
The invention makes the engine operation dynamic rather than continuous - the engine is started only when offset acquisition is needed and stopped when not needed. This dynamic approach allows the system to consume energy only when necessary for calibration, rather than running continuously to mask noise.
Solution Approach 2:
The engine operation for noise masking is performed periodically only when offset acquisition is required, not continuously. This periodic action reduces overall energy consumption while still providing noise masking when the calibration process is executed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the acquisition of accurate offset amounts without causing discomfort to vehicle users by integrating the offset determination process with engine operation, ensuring smooth and quiet vehicle operation.
Implementation Method 1
a resolver that enables the detection of the rotational position of the rotary shaft based on voltage excited due to electromagnetic induction between a rotator and a stator
Data Source
AI summary
A control device of the invention is applied for a hybrid vehicle comprising an internal combustion engine, a motor and a rotational position detector to detect a rotational position of a rotary shaft of the motor. The control device performs a procedure for obtaining an offset amount according to a request for obtaining the offset amount, which offset amount is a difference between a detected rotational position of the rotary shaft with the rotational position detector and an actual rotational position of the rotary shaft. The control device is configured to perform the procedure for obtaining the offset amount while the engine is running, when the vehicle stops and the control device determines that there is the request for obtaining the offset amount.