Vehicle Temperature Sensor Diagnosis Using Electric Pump Pre-cooling
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Solution Overview
Problem
Existing temperature sensor malfunction diagnosis methods in vehicles are inefficient due to prolonged diagnosis times and high malfunction determining thresholds, which can lead to delayed detection of sensor malfunctions and reduced diagnosis frequency.
Innovation Solution
A temperature sensor malfunction diagnosis apparatus and method that drives an electric pump after vehicle stopping, using the battery as a power supply, to accelerate the convergence of temperature sensor detection values and perform diagnosis at a temperature converging time, thereby shortening diagnosis time and reducing the malfunction determining threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If temperature sensor diagnosis is performed using conventional methods during vehicle operation, then diagnosis can be performed, but diagnosis time is prolonged and diagnosis frequency is reduced
Solution Approach 1:
The electric pump is driven before temperature sensor diagnosis to pre-cool the device and accelerate temperature convergence. By performing this preparatory cooling action in advance, the system reduces the time required for temperature stabilization during diagnosis, enabling more frequent diagnosis cycles without extending total diagnosis time.
Solution Approach 2:
The system implements periodic driving of the electric pump at predetermined intervals before each diagnosis operation. This periodic cooling action ensures that temperature conditions are optimized for diagnosis at regular intervals, increasing diagnosis frequency while maintaining consistent diagnosis timing when temperature convergence is most effective.
2Duration of action of moving object
If conventional diagnosis methods are used without pre-cooling, then system complexity is reduced, but temperature convergence time is prolonged
Solution Approach 1:
The electric pump serves dual functions: it cools the device during normal operation and also performs pre-cooling before temperature sensor diagnosis. By making the pump multi-functional, the system accelerates temperature convergence without adding dedicated pre-cooling equipment, thus reducing overall system complexity while achieving faster temperature stabilization.
Solution Approach 2:
The system uses its own existing electric pump component to perform the pre-cooling function required for accelerated temperature convergence. Rather than introducing external or dedicated cooling equipment, the system leverages its existing resources to serve the diagnosis preparation need, avoiding increased system complexity.
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 accelerates the temperature sensor diagnosis and allows for a more frequent and timely detection of malfunctions, improving the reliability of temperature sensor diagnostics in vehicles.
Implementation Method 1
The refrigerant circuit is configured to circulate a refrigerant through the device
Implementation Method 2
The electric pump is provided in the refrigerant circuit... circulate a refrigerant
Data Source
AI summary
A temperature sensor malfunction diagnosis apparatus is provided in a vehicle that includes a device, a refrigerant circuit, an electric pump, a battery, and a temperature sensor, and configured to diagnose malfunction of the temperature sensor. The temperature sensor malfunction diagnosis apparatus includes a pump driver and a malfunction diagnosis unit. The pump driver is configured to drive the electric pump after stopping of driving of the vehicle, on the basis of the battery as a power supply. The malfunction diagnosis unit is configured to perform a malfunction diagnosis of the temperature sensor, on a condition that a charged time reaches a temperature converging time of the temperature sensor while the electric pump is driven. The charged time is a time during which charging of the battery is performed from start of the charging of the battery.