Motor Temperature Measurement Using Segmented Gain Circuit
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Solution Overview
Problem
Conventional motor temperature sensors for hybrid electric vehicles require multiple sensors to achieve linearity across the entire temperature range, increasing manufacturing costs and reducing stability and reliability due to deviations at low temperatures.
Innovation Solution
A method that divides the temperature measurement range into high and low ranges, using two gain blocks within a single hardware gain circuit to measure temperatures, ensuring linearity across the entire range without the need for multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two types of temperature sensors are used to cover the entire temperature range, then the measurement precision is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The temperature measurement range is segmented into two ranges (first temperature range and second temperature range), and a single temperature sensor is used with different gain values applied to each segment. This resolves the contradiction by maintaining measurement precision across the entire range while using only one sensor, thereby reducing device complexity.
Solution Approach 2:
The gain value of the temperature sensor is changed based on the temperature range. When the temperature is in the first range, a first gain value is applied; when in the second range, a second gain value is applied. This parameter change allows a single sensor to achieve precision across the full temperature spectrum without requiring multiple sensors.
2Measurement precision
If two types of temperature sensors are used to cover the entire temperature range, then the measurement precision is improved, but the manufacturing cost increases
Solution Approach 1:
The temperature range is segmented into two ranges with different gain values applied in each segment. This allows a single temperature sensor to replace two sensors, directly reducing manufacturing cost while maintaining measurement precision through range-specific gain adjustment.
Solution Approach 2:
The gain parameter of the temperature sensor is dynamically changed based on the detected temperature range. This parameter adjustment enables one sensor to perform the work of two sensors across different temperature ranges, reducing component count and manufacturing cost while preserving measurement accuracy.
3Device complexity
If a single temperature sensor is used with a fixed gain circuit, then the device complexity is reduced, but the measurement precision deteriorates at temperatures outside the linear range
Solution Approach 1:
The gain value is made dynamic rather than fixed. The system automatically selects between a first gain value and a second gain value based on the current temperature range. This dynamic adjustment allows a single sensor to maintain high measurement precision across the entire temperature spectrum, compensating for the limited linear range of individual sensors.
Solution Approach 2:
The gain parameter is changed based on the temperature range detected. When temperature falls within the first range, the first gain value is applied; when within the second range, the second gain value is applied. This parameter change enables a single sensor to achieve precision across the full range that would otherwise require multiple sensors with different characteristics.
4Adaptability or versatility
If the temperature measurement range is extended to cover both low and high temperatures, then the adaptability is improved, but the reliability deteriorates due to sensor deviation at low temperatures
Solution Approach 1:
The temperature measurement system is segmented into two ranges with dedicated gain values for each. The first gain value is optimized for the first temperature range and the second gain value for the second temperature range. This segmentation extends the adaptability to cover the full temperature spectrum while improving reliability by using range-optimized gain values that compensate for sensor deviations at low temperatures.
Solution Approach 2:
The gain parameter is changed based on the temperature range to maintain reliability. By applying a first gain value for the first temperature range and a second gain value for the second temperature range, the system extends its adaptability while compensating for sensor inaccuracies, particularly at low temperatures, thereby maintaining high reliability across the entire operating range.
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
This approach improves the stability and reliability of motor control by extending the temperature measurement range, reducing manufacturing costs, and minimizing component replacement, while maintaining precision at both high and low temperatures.
Implementation Method 1
The temperature sensors mounted in a hybrid electric vehicle are classified into negative thermal coefficient (NTC) sensors and positive thermal coefficient (PTC) sensors
Implementation Method 2
the resistance value of the NTC or PTC sensor is suitably converted into a voltage value by a hardware gain circuit 12 to measure the temperature of the motor
Data Source
AI summary
The present invention provides a method for measuring the temperature of a motor for a hybrid electric vehicle. In preferred embodiments, the method of the present invention can preferably ensure the stability and reliability of motor control by extending the linearity of a temperature sensor attached to the motor within a required measurement range. The present invention preferably provides a method for measuring the temperature of a motor for a hybrid electric vehicle, in which a required measurement range of motor temperature is divided into high and low temperature ranges and a hardware gain circuit is divided into first and second gain blocks such that the first gain block measures the temperature of the high temperature range and the second gain block measures the temperature of the low temperature range.