Engine Coolant Temperature Control Using Dual-Point Feedback
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Solution Overview
Problem
Existing coolant temperature control systems for engines rely solely on outlet temperature measurements, leading to unreliable adjustments and potential overheating or underheating due to delayed feedback, which can cause engine damage and inefficiency.
Innovation Solution
A coolant system that monitors both inlet and outlet temperatures using a feedback loop, incorporating a controller to adjust coolant flow based on real-time engine inlet and outlet temperature data, utilizing a cascade control mechanism to maintain a target temperature without overshooting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant temperature control relies solely on outlet temperature measurements, then the control system is simple, but the temperature control reliability deteriorates due to delayed feedback and potential overheating or underheating
Solution Approach 1:
The patent implements a dual-feedback control system that measures both inlet and outlet coolant temperatures. The controller receives feedback from both sensors and uses this information to adjust the coolant flow control valve, eliminating the delayed feedback problem of single-point measurement and achieving reliable real-time temperature control throughout the engine coolant system.
Solution Approach 2:
The patent divides the temperature monitoring function into two separate measurement points (inlet and outlet) with dedicated sensors. This segmentation allows the control system to monitor temperature changes at different locations independently, providing more comprehensive information for accurate temperature control and preventing both overheating and underheating conditions.
2Stability of the object's composition
If coolant flow control adjusts based on delayed outlet temperature feedback, then the control mechanism is simple, but the temperature stability deteriorates due to overshooting and oscillations
Solution Approach 1:
The patent uses inlet temperature measurement to predict future outlet temperature trends before the actual temperature change occurs. The controller proactively adjusts the coolant flow control valve based on inlet temperature readings, preventing temperature overshooting and oscillations by acting in advance rather than reacting to delayed outlet temperature feedback.
Solution Approach 2:
The dual-temperature feedback system provides the controller with real-time information about both incoming and outgoing coolant temperatures. This comprehensive feedback enables the controller to calculate the temperature differential and adjust the coolant flow rate dynamically, maintaining stable temperature control without the oscillations caused by delayed single-point feedback.
3Measurement precision
If temperature control uses single-point measurement, then the measurement system is simple, but the temperature measurement precision deteriorates due to inability to detect actual engine temperature changes
Solution Approach 1:
The patent segments the temperature monitoring function into two distinct measurement points (inlet and outlet) with separate sensors. This segmentation enables the system to measure temperature changes at different locations, calculate the actual temperature differential across the engine, and determine precise engine operating temperature conditions that single-point measurement cannot detect.
Solution Approach 2:
The inlet temperature sensor acts as an intermediary measurement point that provides early warning of temperature changes before they reach the outlet. By measuring temperature at the inlet, the system gains predictive information about upcoming temperature changes, enabling more precise and proactive temperature control.
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
The system effectively maintains a stable engine coolant temperature, preventing overheating and underheating, thus ensuring engine performance and longevity while improving fuel efficiency.
Implementation Method 1
coolant is circulated through the engine to remove generated heat
Implementation Method 2
The heated coolant passes through a heat exchanger, radiator, or other cooling device where the absorbed heat is released thereby cooling the coolant
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A controller includes at least one processor coupled to a memory storing instructions that, when executed by the at least one processor, cause the at least one processor to: determine a target engine outlet coolant temperature for a coolant in an engine system; determine an adjustment to a temperature of the coolant based on a determined engine inlet coolant temperature and the target engine outlet coolant temperature; and, alter a flow of the coolant by controlling a coolant valve in response to the determination of the adjustment to the temperature of the coolant.