# US 11,441,475 B2 · Cooling system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,475 B2 - Document ID: US11441475B2 - Status: Granted - Kind: B2 - Application number: 17/179,412 - Filed: 2021-02-19 - Published: 2021-10-28 - Granted: 2022-09-13 - Earliest claimed: 2020-04-22 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Hiroyuki Sugihara - Web page: https://patentgrep.com/patent/US11441475B2 ## CPC - F01P 7/10: by throttling amount of air flowing through liquid-to-air heat exchangers - B60K 6/24: characterised by the combustion engines - B60K 6/26: characterised by the motors or the generators - B60K 11/04: Arrangement or mounting of radiators, radiator shutters, or radiator blinds - B60K 11/085: {with adjustable shutters or blinds} - F01P 3/18: Arrangements or mounting of liquid-to-air heat-exchangers (such arrangements on cylinders or cylinder heads F01P3/04; relative to vehicles B60K11/04) - F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) - B60K 6/22: characterised by apparatus, components or means specially adapted for HEVs - F01P 7/12: by thermostatic control - F01P 2003/182: {with multiple heat-exchangers} - F01P 2003/185: {arranged in parallel} - F01P 2050/24: Hybrid vehicles - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES ## Abstract A cooling system of a hybrid vehicle includes a radiator, an openable and closable first shutter, an openable and closable second shutter, and a control device. The radiator is placed forward of an internal combustion engine and a heat generation device configured to generate heat along with operation of the drive motor, and the radiator communicates with the heat generation device and the internal combustion engine such that a coolant circulates through the internal combustion engine and the heat generation device. The first shutter extends from a front end of an undercover so as to cross between the radiator, and the heat generation device and the internal combustion engine. The second shutter extends between a front end part of the undercover and a lower part of the radiator. The control device controls opening and closing of the first shutter and the second shutter. ## Claims ### Claim 1 A cooling system for a hybrid vehicle driven by an internal combustion engine and a drive motor, the cooling system comprising: a radiator placed forward of the internal combustion engine and a heat generation device configured to generate heat along with operation of the drive motor, the radiator communicating with the heat generation device and the internal combustion engine such that a coolant circulates through the internal combustion engine and the heat generation device; a first shutter provided in an openable and closable manner such that the first shutter extends from a front end or a top face of an undercover so as to cross between the radiator, and the heat generation device and the internal combustion engine, the undercover being provided below the internal combustion engine and the heat generation device, the undercover being configured to partially cover a bottom face of the hybrid vehicle; a second shutter provided in an openable and closable manner such that the second shutter extends between a front end part of the undercover and a lower part of the radiator; and a control device configured to control opening and closing of the first shutter and the second shutter. ### Claim 2 (depends on 1) The cooling system according to claim 1, wherein the radiator includes a first radiator communicating with the internal combustion engine, and a second radiator communicating with the heat generation device. ### Claim 3 (depends on 2) The cooling system according to claim 2, wherein the second radiator is formed separately from the first radiator and is at least partially placed downward from the first radiator. ### Claim 4 (depends on 1) The cooling system according to claim 1, wherein, when the hybrid vehicle is driven by the drive motor without being driven by the internal combustion engine, the control device closes the first shutter and opens the second shutter. ### Claim 5 (depends on 1) The cooling system according to claim 1, wherein, when the hybrid vehicle is driven by the internal combustion engine, the control device opens the first shutter. ### Claim 6 (depends on 5) The cooling system according to claim 5, wherein, even in a case where the hybrid vehicle is driven by the internal combustion engine, when the internal combustion engine is during warming-up, the control device closes the first shutter. ### Claim 7 (depends on 5) The cooling system according to claim 5, wherein, when traveling noise of the hybrid vehicle is a predetermined value or less or is expected to become the predetermined value or less, or when a temperature of an exhaust pipe of the internal combustion engine is a predetermined temperature or more or is expected to become the predetermined temperature or more, the control device closes the second shutter.