Warm-up control device for internal-combustion engine and warm-up control method

• US 6,520,136 B2
• Filed: 09/12/2001
• Issued: 02/18/2003
• Est. Priority Date: 09/13/2000
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Suzuki, Makoto, Arisawa, Katuhiko, Ito, Yasushi, Tabata, Masakazu
• Primary Examiner(s): Kamen, Noah P.
• Application Number:
  US09/949,959
• Publication Number:
  US 20020029755A1
• Time in Patent Office: 524 Days
• Field of Search: 123/142.5 R, 701/113
• US Class Current: 123/142.50R
• CPC Class Codes: F01P 2011/205 using heat-accumulators
• CPC Class Codes: F02N 19/10 by heating of engine coolants
• CPC Class Codes: F16H 57/0413 Controlled cooling or heating of lubricant; Temperature control therefor

Abstract

A warm-up control device for an internal-combustion engine comprises a heat storage device for storing a heating medium heated during operation of the engine, supplies the heating medium stored in the heat storage device to a drive device (a transmission and the like) prior to the start of the engine or:at the start of the engine, and supplies the heating medium stored in the heat storage device to the drive device while maintaining a condition where the heating medium is circulated in the path excluding the heat storage device and including the drive device after the start of the engine.

The warm-up control device supplies the heating medium heat-insulated and stored in the heat storage device during operation of the engine, and sets the ratio between the amount of the heating medium supplied from the heat storage device to the and the amount of the heating medium supplied from the heat storage device to the drive device, on the basis of the temperature of the engine and the temperature of the drive device.

At the start of the internal-combustion engine, the heating medium can be supplied to the engine or the drive device efficiently, and the warm-up can be performed as required.

Claims

1. A warm-up control device for an internal-combustion engine, comprising:

a heat storage device that stores a heating medium heated during operation of the internal-combustion engine;

a first path that supplies the heating medium from the heat storage device to the engine;

a second path that supplies the heating medium from the heat storage device to a drive device, having a heat exchanger for exchanging heat between the heating medium passing through the engine and a hydraulic fluid;

a circulation path that allows the heating medium to pass through the engine without passing through the heat storage device; and

a controller that selects at least one of the first path, the second path, and the circulation path as a path for supplying the heating medium to at least either of the engine or the drive device according to the temperature rising condition of the engine,

wherein the controller supplies the heating medium to the engine through the first path prior to the start of the engine or at the start of the engine, and supplies the heating medium to the drive device through the second path while maintaining a condition where the heating medium circulates in the circulation path after the start of the engine.

2. The warm-up control device according to claim 1, wherein the first path and second path communicate with each other, and the controller supplies the heating medium to the location requiring temperature rise through the engine prior to the start of the engine or at the start of the engine.

3. The warm-up control device according to claim 1, wherein the drive device is a transmission for transmitting power of the engine to wheels.

4. A warn-up control device for an internal-combustion engine, comprising:

a heat storage device that stores a heating medium heated during operation of the internal-combustion engine;

a first path that supplies the heating medium from the heat storage device to the engine;

a second path that supplies the heating medium from the heat storage device to a drive device having a heat exchanger for exchanging heat between the heating medium passing through the engine and a hydraulic fluid;

a first sensor that detects the temperature of the engine;

a second sensor that detects the temperature of the drive device; and

a setting device that sets the ratio between the amount of the heating medium supplied to the engine through the first path and the amount of the heating medium supplied from the heat storage device to the drive device through the second path, on the basis of the engine temperature detected by the first sensor and the temperature of the location requiring temperature rise detected by the second sensor.

5. The warm-up control device according to claim 4,

wherein the setting device sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the internal-combustion engine is larger than the amount of the heating medium supplied from the heat storage device to the drive device when the detected engine temperature is a predetermined temperature or lower.

6. The warm-up control device according to claim 4,

wherein the setting device sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the drive device is larger than the amount of the heating medium supplied from the heat storage device to the internal-combustion engine when the detected engine temperature is a first predetermined temperature or higher.

7. The warm-up control device according to claim 6,

wherein the setting device sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the internal-combustion engine is larger than the amount of the heating medium supplied from the heat storage device to the drive device when the temperature of the location requiring temperature rise is a second predetermined temperature or higher, even if the detected engine temperature is the first predetermined temperature or higher.

8. The warm-up control device according to claim 4, wherein the setting device sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the drive device is larger than the amount of the heating medium supplied from the heat storage device to the internal-combustion engine from the start of the engine until the temperature of the drive device reaches a predetermined temperature, and sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the internal-combustion engine is larger than the amount of the heating medium supplied from the heat storage device to the drive device after the temperature of the location requiring temperature rise reaches the predetermined temperature.

9. The warm-up control device according to claim 4,

wherein the setting device sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the internal-combustion engine is larger than the amount of the heating medium supplied from the heat storage device to the drive device from the start of the engine until the temperature of the internal-combustion engine reaches a predetermined temperature, and sets the ratio between the amount of the heating medium supplied from the heat storage device to the internal-combustion engine and the amount of the heating medium supplied from the heat storage device to the drive device such that the amount of the heating medium supplied from the heat storage device to the drive device is larger than the amount of the heating medium supplied from the heat storage device to the internal-combustion engine after the temperature of the internal-combustion engine reaches the predetermined temperature.

10. The internal-combustion engine according to claim 7,

wherein the drive device is a transmission for transmitting power of the engine to wheels.

11. The warm-up control device according to claim 10,

wherein the transmission includes a supply device that allows only part of lubricating oil stored in the transmission to circulate in the transmission during warm-up, and a heating device that heats only the part of the lubricating oil using the heating medium supplied from the heat storage device.

12. A warm-up control method for an internal-combustion engine, having a heat storage device that stores a heating medium heated during operation of the internal-combustion engine, comprising:

supplying a heating medium stored in the heat storage device to a drive device, having a heat exchanger that exchanges heat between the heating medium passing through the engine and a hydraulic fluid, through the engine prior to the start of the internal-combustion engine or at the start of the engine; and

supplying the heating medium stored in the heat storage device to the drive device while maintaining a condition where the heating medium is circulated in the path excluding the heat storage device and including the engine after the start of the engine.

13. The control method according to claim 12,

wherein the drive device is a transmission for transmitting power of the engine to wheels.

14. A warm-up control method for an internal-combustion engine, having a heat storage device that stores a heating medium heated during operation of the internal-combustion engine while maintaining its temperature, comprising:

supplying the heating medium stored in the heat storage device to the engine prior to the start of the internal-combustion engine or at the start of the engine, and

circulating the heating medium in a path excluding the heat storage device and including the engine after the start of the engine, and then supplying part of the circulating heating medium to a drive device, having a heat exchanger that exchanges heat between the heating medium passing through the engine and a hydraulic fluid, without passing the part of the circulating heating medium through the heat storage device.

15. The control method according to claim 14,

wherein the drive device is a transmission for transmitting over of the engine to wheels.

16. A warm-up control method for an internal-combustion engine, having a heat storage device that stores a heating medium heated during operation of the internal-combustion engine, that performs warm-up by supplying the heating medium stored in the heat storage device to the internal-combustion engine and to a drive device, having a heat exchanger for exchanging heat between the heating medium passing through the engine and a hydraulic fluid, prior to the start of the engine or at the start of the engine, comprising:

detecting the temperature of the engine;

detecting the temperature of the drive device; and

setting the ratio between the amount of the heating medium supplied to the engine and the amount of the heating medium supplied to the drive device on the basis of the engine temperature detected by the first sensor and the temperature of the drive device determined by the second sensor.

17. A warm-up control device for an internal-combustion engine, comprising:

a heat storage device that stores a heating medium heated during operation of the internal-combustion engine;

a first path that supplies the heating medium from the heat storage device to the engine;

a second path that supplies the heating medium from the heat storage device to a drive device, having a heat exchanger for exchanging heat between the heating medium passing through the engine and a hydraulic fluid;

a circulation path that allows the heating medium to pass through the engine without passing through the heat storage device;

a third path communicating with the circulation path, that allows the heating medium to pass through the drive device without passing through the heat storage device; and

a controller that selects at least one of the first path, the second path, and the circulation path as a path for supplying the heating medium to at least either of the engine or the drive device according to the temperature rising condition of the engine, and the controller supplies the heating medium to the engine through the first path prior to the start of the engine or at the start of the engine, and supplies part of the heating medium to the drive device through the third path.

18. The warm-up control device according to claim 17, wherein the drive device is a transmission for transmitting power of the engine to wheels.