Coolant Heater Temperature Sensing for Dry-Condition Protection
Solution Overview
Problem
Coolant heaters in internal combustion engines are prone to damage when not fully submerged in coolant, leading to overheating and potential failure due to delayed detection of dry conditions.
Innovation Solution
Incorporating temperature sensors, such as thermistors, to directly measure coolant temperatures within the heater, allowing for rapid detection of dry conditions and immediate disconnection of power to the heating element, thereby preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the heating element operates without complete submersion in coolant, then heating efficiency increases, but the heating element overheats and gets damaged
Solution Approach 1:
The system employs temperature sensors that continuously monitor coolant temperature and provide feedback to the control module. When the heating element is not fully submerged, the coolant temperature rises rapidly, triggering the sensor feedback mechanism to detect this abnormal temperature increase rate and switch off the heating element, thus preventing overheating damage while allowing efficient operation during normal submersion conditions
Solution Approach 2:
The system dynamically adjusts the heating element's operational state based on real-time temperature conditions. The control module continuously evaluates temperature data and automatically transitions the heating element between on and off states, optimizing heating efficiency when properly submerged while preventing damage when submersion is incomplete
2Reliability
If the system continuously monitors temperature to detect improper submersion, then heating element protection improves, but system complexity increases
Solution Approach 1:
The temperature sensors and control module utilize the existing thermal dynamics of the coolant-heating element system to detect improper submersion. The system monitors its own operational parameters (temperature and temperature rate of change) and automatically makes protection decisions, eliminating the need for separate complex detection mechanisms or external monitoring systems
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
Faster detection and response to dry conditions in coolant heaters reduce thermal stress and prevent damage, ensuring efficient and reliable operation of the heating system.
Implementation Method 1
an electrically resistive heating element that is disposed within the housing and that is configured to generate heat when power is applied to the heating element
Implementation Method 2
the temperature sensor is a thermistor
Implementation Method 3
the condition is at least a portion of the heating element not being submerged in coolant
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A coolant heating system includes: a coolant heater including: a housing including: an inlet configured to receive coolant; and an outlet configured to output coolant; an electrically resistive heating element that is disposed within the housing and that is configured to generate heat when power is applied to the heating element; and a temperature sensor configured to measure a temperature of coolant within the housing; and a heater control module configured to: receive the temperature from the temperature sensor; selectively control application of power to the heating element based on maintaining the temperature at or above a predetermined temperature; selectively detect the presence of a condition based on the temperature; and when the presence of the condition is detected, disconnect the heating element from power.