Vehicle Cooling Control Using Maximum Demand to Prevent Oscillation
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Solution Overview
Problem
Existing vehicle cooling systems experience periodic oscillation of servo component operating states, leading to reduced service life due to independent control logics and uncoordinated adjustments between components like cooling fans and water pumps.
Innovation Solution
A method and system that acquire current temperature and temperature change rates to determine cooling demand values, using preset tables to correlate servo component operations and maintain balance, preventing oscillations by controlling servo components based on maximum demand values and predefined relations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent control logics are used for each servo component in the cooling system, then each component can be controlled individually, but periodic oscillation occurs in the operating states of the servo components and service life is reduced
Solution Approach 1:
The patent merges the control of multiple servo components (water pump, cooling fan, electronic throttle valve) into a unified control system. The controller receives temperature information from multiple cooling objects and coordinates the operation of all servo components together, eliminating independent control logics that cause oscillation. This unified approach ensures that when one component adjusts, others are coordinated to maintain system balance, preventing periodic oscillation and extending service life.
2Adaptability or versatility
If the cooling fan state changes during cooling process, then cooling capacity is adjusted, but the balance point of the system is broken and water pump must be adjusted again, causing periodic oscillation
Solution Approach 1:
The controller calculates required cooling capacities for all cooling objects in advance and determines the optimal operating states for all servo components before actual cooling begins. When temperature conditions change, the controller pre-coordinates adjustments across all components rather than allowing sequential, reactive adjustments. This preliminary coordination maintains system balance and prevents the oscillation that occurs when components adjust independently in response to changing conditions.
3Adaptability or versatility
If multiple cooling objects are controlled independently, then each object's temperature can be managed, but control complexity increases and oscillation occurs
Solution Approach 1:
The patent implements a universal control system that handles multiple cooling objects (engine, motor, power converter) through a single controller that processes temperature information from all objects and coordinates all servo components. Rather than implementing separate independent control logics for each cooling object, the unified controller applies a comprehensive control strategy that considers all cooling demands simultaneously, determining optimal operating states for water pump, cooling fan, and electronic throttle valve that satisfy all cooling requirements. This multi-functional approach reduces control complexity and eliminates oscillation while maintaining the ability to manage multiple cooling objects.
Data Source
AI summary
A method and a system for controlling cooling of a vehicle, and a vehicle are provided in the present disclosure. In the present disclosure, a maximum value among cooling demand values of cooling objects is used to control a servo component in a cooling system to operate according to an execution opening determined by a preset corresponding relation, so that operating states of the servo components may be correlated and may be comprehensively controlled, so as to prevent the control system from oscillating and improve control stability, thus solving a problem that periodic oscillation of the operating states of the servo components is easily caused and service life of the servo components is affected in existing control modes of the cooling system of the vehicle.