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JP-7856514-B2 - thermal management device

JP7856514B2JP 7856514 B2JP7856514 B2JP 7856514B2JP-7856514-B2

Inventors

  • 長谷川 吉男
  • 古川 智
  • 大村 充世

Assignees

  • トヨタ自動車株式会社
  • 株式会社SUBARU

Dates

Publication Date
20260511
Application Date
20220714

Claims (4)

  1. A thermal management device mounted on a vehicle comprises a first thermal circuit through which a first thermal medium circulates, a second thermal circuit through which a second thermal medium circulates, and a control unit. The first thermal circuit is, First radiator and, Battery and It is equipped with, The second thermal circuit is, A heater for heating the second heat transfer medium, A temperature sensor configured to measure the temperature of the second heat transfer medium and output the measured temperature, The first route and, A second radiator is arranged on the first path, and is configured such that the first heat transfer medium flowing through the first radiator and the second heat transfer medium flowing through the second radiator can exchange heat. A second path parallel to the first path, A heater is positioned on the second path and heats the interior of the vehicle using the second heat transfer medium as a heat source, A flow rate adjustment unit configured to allow the second heat transfer medium to flow to the first and second paths, It is equipped with, When a battery heating request and a heating request are received, the control unit heats the second heat transfer medium with the heater and performs a flow splitting process by which the second heat transfer medium is split into the first path and the second path using the flow rate adjustment unit. In the aforementioned flow splitting process, when the difference between the measured temperature and the target temperature of the second heat transfer medium is greater than a predetermined first threshold, the second flow splitting ratio to the second path is made greater than the first flow splitting ratio to the first path. Thermal management equipment.
  2. A second threshold smaller than the first threshold is predetermined. In the aforementioned flow separation process, When the deficit value is greater than the first threshold, the second current distribution ratio is controlled to the first fixed value. When the deficit value is smaller than the second threshold value, the second current distribution ratio is controlled to a second fixed value smaller than the first fixed value. The thermal management device according to claim 1, wherein when the deficit value is less than the first threshold and greater than the second threshold, the second flow division ratio is controlled to simply decrease from the first fixed value to the second fixed value in accordance with the decrease in the deficit value.
  3. The thermal management device according to claim 2, wherein the first fixed value is set to a larger value as the heating load of the heater increases.
  4. The control unit is configured to variably control the target temperature of the second heat transfer medium within a predetermined temperature range. The thermal management device according to claim 1, wherein the control unit sets the target temperature to the upper limit of the predetermined temperature range when the battery heating request and the heating request are requested.

Description

The technology disclosed herein relates to thermal management systems. Patent Document 1 discloses a thermal management device for installation in a vehicle. This thermal management device has multiple thermal circuits (heater circuit, battery circuit, etc.) through which a heat transfer medium circulates. By heating the heat transfer medium in the heater circuit using a heater, the vehicle interior can be heated. Furthermore, by transferring the heat from the heat transfer medium in the heater circuit to the battery circuit, the battery can be heated. Japanese Patent Publication No. 2021-154814 Circuit diagram of the thermal management device 100.A graph showing the control modes for valve opening.A graph showing a specific example of control in current diversion processing.Circuit diagram of a modified thermal control device 100a. The technical elements of the thermal management system disclosed in this specification are listed below. Each of these technical elements is independently useful. In one example of a thermal management device disclosed herein, a second threshold less than the first threshold may be predetermined. In the flow diversion process, when the deficiency value is greater than the first threshold, the second flow diversion ratio may be controlled to a first fixed value. In the flow diversion process, when the deficiency value is less than the second threshold, the second flow diversion ratio may be controlled to a second fixed value less than the first fixed value. In the flow diversion process, when the deficiency value is less than the first threshold and greater than the second threshold, the second flow diversion ratio may be controlled to simply decrease from the first fixed value to the second fixed value as the deficiency value decreases. In this configuration, the second flow diversion ratio can be gradually reduced as the deficiency value becomes less than the first threshold. This makes it possible to gradually increase the battery heating capacity as the measured temperature of the second heat medium approaches the target temperature. It becomes possible to allocate more of the heater's capacity to battery heating while maintaining a sense of warmth. In one example of a thermal management system disclosed herein, the first fixed value may be set to a larger value as the heating load of the heater increases. This configuration allows for higher priority on heating over battery heating as the heating load increases. This improves responsiveness to heating requests. In one example of a thermal management system disclosed herein, the control unit may be configured to variably control the target temperature of the second heat transfer medium within a predetermined temperature range. The control unit may set the target temperature to the upper limit within the predetermined temperature range when a battery heating request and a heating request are received. This configuration allows for maximum utilization of the heater's capacity when battery heating and heating are performed simultaneously. It also improves responsiveness to battery heating and heating requests.