Cooling apparatus for hybrid vehicle

• US 20040163861A1
• Filed: 01/21/2004
• Published: 08/26/2004
• Est. Priority Date: 02/24/2003
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Kimura, Hideo, Abe, Noriyuki, Fukuda, Kenji, Saito, Osamu, Hasebe, Tetsuya, Hotta, Naoki
• Granted Patent: US 7,082,905 B2
• Time in Patent Office: Days
• US Class Current: 180/65.2
• CPC Class Codes: B60K 11/02 with liquid cooling
• CPC Class Codes: B60K 2001/003 with means for cooling the electrical propulsion units
• CPC Class Codes: B60K 6/22 characterised by apparatus, components or means specially adapted for HEVs
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60K 6/54 Transmission for changing ratio
• CPC Class Codes: F01P 2025/50 using two or more temperature sensors
• CPC Class Codes: F01P 2050/24 Hybrid vehicles
• CPC Class Codes: F01P 2050/30 Circuit boards
• CPC Class Codes: F01P 2060/08 Cabin heater
• CPC Class Codes: F01P 3/20 Cooling circuits not specific to a single part of engine or machine F01P3/22 takes precedence
• CPC Class Codes: F01P 7/165 characterised by systems with two or more loops
• CPC Class Codes: F01P 7/167 by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

In order to appropriately control the temperature state of multiple equipment having differing management temperatures, while preventing complication of the apparatus structure, a cooling apparatus for a hybrid vehicle is provided with a seventh flow path 30g which flows coolant which has flowed only through a main flow path 22a of a radiator 22 to a water jacket 25 via a first thermostat 23 which has an induction temperature set relatively high; an eighth flow path 30h which flows coolant which has flowed through the main flow path 22a and a sub flow path 22b of the radiator 22 to the water jacket 25 via a second thermostat 24 which has an induction temperature set relatively low, and also supplies the coolant to a PDU 14 and a downverter 15; and a bypass flow path 30j which connects a fifth flow path 30e which supplies coolant discharged from the water jacket 25 to the radiator 22, and a position of the eighth flow path 30h on a downstream side of the second thermostat 24.

Claims

1. A cooling apparatus for a hybrid vehicle,

the hybrid vehicle comprising:

an internal combustion engine for driving the hybrid vehicle;

a motor as a power source for driving the hybrid vehicle together with the internal combustion engine, and

a motor control device for controlling the operation of the motor; and

the cooling apparatus for the hybrid vehicle comprising;

a cooling circuit for cooling said internal combustion engine and said motor control device by common coolant; and

a temperature setting device for setting independently a temperatures a management temperature of the internal combustion engine and the management temperature of the said motor control device.

2. A cooling apparatus for a hybrid vehicle according to claim 1, wherein the cooling apparatus comprises a radiator provided with a plurality of flow paths for radiating heat of said internal combustion engine and said motor, and the temperature setting device sets said management temperatures independently by flowing the coolant through each of said plurality of flow paths.

3. A cooling apparatus for a hybrid vehicle according to claim 1 or claim 2, wherein an output shaft of said internal combustion engine and an output shaft of said motor are mechanically connected.

4. A cooling apparatus for a hybrid vehicle according to any one of claim 1, wherein the cooling apparatus comprises a plurality of thermostats having induction temperatures differ from each other, and each management temperature is independently set at a temperature by means of said plurality of thermostats.

5. A cooling apparatus for a hybrid vehicle according to claim 1, wherein the cooling apparatus comprising:

a circulation path having a water jacket provided in an interior of said internal combustion engine and a water pump which circulates coolant to said water jacket;

a radiator having a plurality of flow paths constituting different flow paths for said coolant;

a supply path which branches from said circulation path at downstream of said water jacket for flowing said coolant to said radiator;

a first flow path for flowing said coolant to said circulation path from said radiator through a first thermostat which has an induction temperature set relatively high;

a second flow path for flowing said coolant to said circulation path from said radiator through a second thermostat which has an induction temperature set relatively low, and also supplies said coolant to said motor control device; and

a bypass flow path which connects said supply flow path to a position downstream of said second thermostat of said second flow path.

6. A cooling apparatus for a hybrid vehicle according to claim 5, wherein said second thermostat is disposed at a position downstream of said motor control device.

7. A cooling apparatus for a hybrid vehicle according to claim 6, wherein

said motor is arranged in a position downstream of said motor control device in said second flow path, and

said second thermostat is arranged in a position between said motor control device and said motor and is connected to said bypass flow path.

8. A cooling apparatus for a hybrid vehicle according to claim 5, wherein said second thermostat is arranged in a position upstream of said motor control device.

9. A cooling apparatus for a hybrid vehicle according to claim 1, wherein the cooling apparatus comprising:

a circulation path having a water jacket provided in an interior of said internal combustion engine and a water pump which circulates coolant to said water jacket;

a radiator having a plurality of flow paths constituting different flow paths for said coolant;

a supply path which branches off from said circulation path at a position downstream of said water jacket and which flows said coolant to said radiator;

a first flow path which flows said coolant to said circulation path from said radiator through a first thermostat which has a relatively high induction temperature;

a second flow path which flows said coolant to said circulation path from said radiator via a second thermostat which has a relatively low induction temperature, and also supplies said coolant to said motor control device; and

a bypass flow path which connects at upstream of said water jacket a position of said circulation path between said water pump and said water jacket to a position on a downstream side of said second thermostat of said second flow path.

10. A cooling apparatus for a hybrid vehicle according to claim 1, wherein the cooling apparatus comprising:

a circulation path having a water jacket provided in an interior of said internal combustion engine and a water pump which circulates coolant to said water jacket;

a radiator having a plurality of flow paths constituting different flow paths for said coolant;

a supply path which branches from said circulation path at a position downstream of said water jacket and which supplies coolant to said radiator;

a first flow path which flows said coolant to said circulation path from said radiator through a first thermostat which has a relatively high induction temperature; and

a second flow path which flows said coolant to said circulation path from said radiator through a second thermostat which has a relatively low induction temperature, and also supplies said coolant to said motor control device; and

said second thermostat is disposed in said circulation path.