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Method for controlling coolant flow and cooling of heater core of vehicle to extend engine auto-stop period

A heater core, auto-stop technology, used in vehicle components, heating/cooling equipment, transportation and packaging, to solve problems such as passenger discomfort, cooling vehicle cabin reduction, etc.

Active Publication Date: 2019-06-18
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the engine is automatically stopped (i.e., independent of the vehicle's ignition system, Auto Stop Engine Off - Engine Off), the HVAC system's ability to cool the vehicle's cabin is significantly reduced, which can lead to occupant discomfort in warm conditions

Method used

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  • Method for controlling coolant flow and cooling of heater core of vehicle to extend engine auto-stop period
  • Method for controlling coolant flow and cooling of heater core of vehicle to extend engine auto-stop period
  • Method for controlling coolant flow and cooling of heater core of vehicle to extend engine auto-stop period

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Embodiment Construction

[0024] A compressor in a vehicle's heating, ventilation and air conditioning (HVAC) system may be driven by the vehicle's engine or the vehicle's electric motor. In either case, the compressor is normally off when the engine is off, and thus the compressor does not circulate refrigerant through the HVAC system when the engine is off. Therefore, when the engine is automatically stopped (ie, the ignition system is turned off independent of the vehicle), the ability of the evaporator to cool the air passing through it decreases as the temperature of the refrigerant stagnant in the evaporator increases. Once the evaporator can no longer cool the air to a comfortable temperature, the engine restarts automatically.

[0025] To solve this problem, the HVAC subsystem according to the present invention includes a bypass valve disposed between the engine and the heater core of the HVAC subsystem. When the engine is started and cooling is required, the HVAC control module according to t...

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Abstract

A method for controlling coolant flow and cooling of a heater core to be used as a cold storage device or heater core cold storage (HCCS) cooling of a vehicle to extend an engine auto-stop period includes determining if at least one predetermined condition is met for HCCS cooling, and charging a heater core for a predetermined charge period in preparation for HCCS cooling when the at least one predetermined condition is met. The charge is held in the heater core until a trigger event occurs and HCCS cooling is initiated. HCCS cooling is then performed until a predetermined use period expires.

Description

technical field [0001] The present invention relates to a method for controlling coolant flow and cooling of a heater core used as a cold storage unit, or "heater core cold storage" (HCCS) cooling of a vehicle to extend the period of automatic engine stop. Background technique [0002] A vehicle's heating, ventilation, and air conditioning (HVAC) subsystem typically includes a compressor, condenser, expansion valve, evaporator, heater core, blower, and damper valves. The compressor pressurizes the refrigerant flowing from the evaporator to the condenser, thereby circulating the refrigerant through the HVAC system. The condenser cools the refrigerant as it flows through the coils in the condenser. The expansion valve reduces the pressure of the refrigerant flowing from the condenser to the evaporator. [0003] The blower forces air through the evaporator and heater core into the interior of the vehicle. The refrigerant flowing through the coils in the evaporator absorbs he...

Claims

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Application Information

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IPC IPC(8): B60H1/00
CPCB60H1/00485B60H1/00778B60H1/322B60H1/005B60H2001/3266B60H2001/3289B60H1/00328B60H1/00764B60H1/00771B60H1/32
Inventor A·P·朗宁S·R·鲍尔温
Owner GM GLOBAL TECH OPERATIONS LLC