Claims
- 1. A cooling system for a spark-ignition two-cycle engine that causes a fresh charge, charged into its combustion chamber, to self-ignite at least in a low-load operation mode, said cooling system comprising:
- a cylinder cooling system;
- a cylinder head cooling system combined in parallel with the cylinder cooling system operating said cylinder head cooling system at a cooling capacity lower than that of the cylinder cooling system when the engine is in a cold condition, and for and
- a cooling fluid temperature regulating means responsive to a plurality of different operating conditions of the spark-ignition two-cycle engine for increasing a cooling capacity of the cylinder head cooling system after a temperature of the cooling fluid circulating through the cylinder head cooling system has reached a predetermined temperature.
- 2. The cooling system according to claim 1, wherein said cylinder head cooling system includes a cylinder head fluid cooling passage, a three-way valve and a cylinder head cooling radiator connectable in series, whereby said three-way valve can be operated by said cooling fluid temperature regulating means to cause cooling fluid in said cylinder head cooling system to either bypass said cylinder head cooling radiator or to deliver said cooling fluid to said cylinder head cooling radiator.
- 3. The cooling system according to claim 2, wherein said cooling fluid temperature regulating means includes a CPU and a servomotor for opening and closing said three-way valve.
- 4. The cooling system according to claim 3, wherein the CPU is responsive to signals indicating a valve opening in the two-cycle engine.
- 5. The cooling system according to claim 3, wherein the CPU is responsive to speed and an intake pressure of the two-cycle engine.
- 6. The cooling system according to claim 1, wherein said cylinder head cooling system includes a first cooling fluid pump, a cylinder head fluid cooling passage, a three-way valve and a cylinder head cooling radiator connectable in series, whereby said three-way valve can be operated by said cooling fluid temperature regulating means to cause cooling fluid in said cylinder head cooling system to either bypass said cylinder head cooling radiator or to deliver said cooling fluid to said cylinder head cooling radiator.
- 7. The cooling system according to claim 6, wherein said cylinder cooling system includes a second cooling fluid pump, a cylinder cooling radiator and a cylinder cooling fluid passage connected in series.
- 8. The cooling system according to claim 6, wherein said cooling water temperature regulating means includes a CPU and a servomotor for opening or closing said three-way valve.
- 9. The cooling system according to claim 2, wherein said cylinder cooling system includes a cylinder cooling radiator and a cylinder cooling fluid passage connected in series.
- 10. A cooling system for a spark-ignition two-cycle engine that causes a fresh charge, charged into its combustion chamber, to self-ignite at least in a low-load operation mode, said cooling system comprising:
- solely two radiators for cooling;
- a cylinder cooling system including a cylinder fluid passage, a thermostat connected in series with one of said radiators; and
- a cylinder head cooling system, including a cylinder head fluid cooling passage, a thermostat connected in series with a second of said radiators, the cylinder cooling system and the cylinder head cooling system combined in parallel, with said cylinder head cooling system during a cold condition of the engine such as a cooling capacity lower than that of the cylinder cooling system during a cold condition of the two-cycle engine so that a fresh charge, charged into a combustion chamber of the spark-ignition two-cycle engine self-ignites in a low operational mode.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-321035 |
Nov 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/348,894 filed on Nov. 25, 1994, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (11)
Number |
Date |
Country |
3633411 |
Jan 1986 |
DEX |
4214850 |
Nov 1993 |
DEX |
53123738 |
Oct 1976 |
JPX |
56-38766 |
Sep 1981 |
JPX |
56-54336 |
Dec 1981 |
JPX |
57-93621 |
Jun 1982 |
JPX |
61-001817 |
Jan 1986 |
JPX |
62-23523 |
Jan 1987 |
JPX |
63-088215 |
Apr 1988 |
JPX |
3-33426 |
Feb 1991 |
JPX |
2247745 |
Nov 1992 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
348894 |
Nov 1994 |
|