Supercharged engine having main and auxiliary combustion chambers

• US 4,150,545 A
• Filed: 11/28/1977
• Issued: 04/24/1979
• Est. Priority Date: 12/10/1976
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Yamazaki, Shuichi
• Primary Examiner(s): Myhre, Charles J.
• Assistant Examiner(s): Reynolds, David D.
• Application Number:
  US05/855,321
• Time in Patent Office: 512 Days
• Field of Search: 123/75 B, 123/119 C, 123/119 CE, 60/600, 60/601, 60/611
• US Class Current: 60/611
• CPC Class Codes: F02B 19/1028 pre-combustion chamber and cylinder having both intake ports or valves, e.g. HONDS CVCC
• CPC Class Codes: F02B 37/00 Engines characterised by provision of pumps driven at least for part of the time by exhaust
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An internal combustion engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening has a first carburetor for supplying a lean mixture to the main combustion chamber and a second carburetor for supplying a rich mixture to the auxiliary combustion chamber. A turbo supercharger is operatively positioned between the first carburetor and the main combustion chamber. When the engine is operating under low load, the lean mixture is bypassed around the supercharger. When the engine is operating under high load, all of the lean mixture passes through the supercharger and a second bypass is opened so that the supercharged lean mixture is delivered to both combustion chambers.

Claims

1. In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening, a first carburetor communicating with a main intake passage, a second carburetor communicating with an auxiliary intake passage, means connecting said main intake passage to said main combustion chamber, said means including a rotary supercharger, said means also including a first bypass passage around said supercharger, a second bypass passage connecting said main intake passage and said auxiliary intake passage, and means responsive to the power output of the engine and acting, when the output is low, to open the first bypass passage and to close the second bypass passage, said means acting, when the engine output is high, to close the first bypass passage and open the second bypass passage, whereby all of the mixture from the first carburetor must pass through the supercharger and whereby a part of that mixture is delivered to both of said combustion chambers.

2. In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening, a first carburetor communicating with a main intake passage, a second carburetor communicating with an auxiliary intake passage, means connecting said main intake passage to said main combustion chamber, said means including a rotary supercharger, said means also including a first bypass passage around said supercharger and provided with a first bypass valve, a second bypass passage connecting said main intake passage and said auxiliary intake passage and provided with a second bypass valve, and means responsive to the power output of the engine and acting, when the output is low, to open the first bypass valve and to close the second bypass valve, said means acting, when the engine output is high, to close the first bypass valve and open the second bypass valve, whereby all of the mixture from the first carburetor must pass through the supercharger and whereby a part of that mixture is delivered to both of said combustion chambers.

3. In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening, a first carburetor communicating with a main intake passage, a second carburetor communicating with an auxiliary intake passage, means connecting said main intake passage to said main combustion chamber, said means including a rotary supercharger, said means also including a first bypass passage bypassing said supercharger and provided with a first bypass valve, a second bypass passage connecting said main intake passage and said auxiliary intake passage and provided with a second bypass valve, said second bypass valve in a first position closing said second bypass passage while opening said auxiliary intake passage, said second bypass valve in a second position closing said auxiliary intake passage upstream from said second bypass valve and opening said second bypass passage, a turbine operated by exhaust gases and serving to drive said supercharger, a selector operatively connected to both of said bypass valves, the selector being responsive to low power output of the engine and acting on said bypass valves to open said first bypass passage and to close said second bypass passage, said selector being responsive to high power output of the engine to act on said bypass valves to close the first bypass passage, to open the second bypass passage and to close the auxiliary passage upstream from the second bypass valve, whereby all of the mixture from the first carburetor must pass through the supercharger and whereby a part of that mixture is delivered to both of said combustion chambers.

4. In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening, a first carburetor having a main primary barrel and a main secondary barrel, each communicating with a main intake passage, a second carburetor having a barrel communicating with an auxiliary intake passage, a throttle valve in each of said barrels, neans connecting said main intake passage to said main combustion chamber, said means including a rotary supercharger, said means also including a first bypass passage bypassing said supercharger and provided with a first bypass valve, a second bypass passage connecting said main intake passage and said auxiliary intake passage and provided with a second bypass valve, said second bypass valve in a first position closing said second bypass passage while opening said auxiliary intake passage, said second bypass valve in a second position closing said auxiliary intake passage upstream from said second bypass valve and opening said second bypass passage, a turbine operated by exhaust gases and serving to drive said supercharger, a selector operatively connected to both of said bypass valves, the selector being responsive to low power output of the engine and acting on said bypass valves to open said first bypass passage and to close said second bypass passage, said selector being responsive to high power output of the engine to act on said bypass valves to close the first bypass passage, to open the second bypass passage and to close the auxiliary passage upstream from the second bypass valve, whereby all of the mixture from the first carburetor must pass through the supercharger and whereby a part of that mixture is delivered to both of said combustion chambers.

5. In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening, a first carburetor having a main primary barrel and a main secondary barrel, each communicating with a main intake passage, a second carburetor having a barrel communicating with an auxiliary intake passage, a throttle valve in each of said barrels, means connecting said main intake passage to said main combustion chamber, said means including a rotary supercharger, said means also including a first bypass passage bypassing said supercharger and provided with a first bypass valve, a second bypass passage connecting said main intake passage and said auxiliary intake passage and provided with a second bypass valve, said second bypass valve in a first position closing said second bypass passage while opening said auxiliary intake passage, said second bypass valve in a second position closing said auxiliary intake passage upstream from said second bypass valve and opening said second bypass passage, a turbine operated by exhaust gases and serving to drive said supercharger, a selector operatively connected to both of said bypass valves, the selector being responsive to the position of the throttle valve in said main primary barrel of said first carburetor, said selector acting on said bypass valves to open said first bypass passage and to close said second bypass passage when the latter said throttle valve is only partially open, said selector acting on said bypass valves to close the first bypass passage, to open the second bypass passage and to close the auxiliary passage upstream from the second bypass valve when the latter said throttle valve is fully open, whereby all of the mixture from the first carburetor must pass through the supercharger and whereby a part of that mixture is delivered to both of said combustion chambers.

6. The method of operating an internal combustion engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch opening, and having a first carburetor for supplying a lean mixture and a second carburetor for supplying a rich mixture, the steps comprising:

on low power output of the engine directing the mixture from the first carburetor to the main combustion chamber and directing the mixture from the second carburetor to the auxiliary combustion chamber, and on high power output of the engine directing all of the mixture from the first carburetor through a turbo supercharger into both combustion chambers, and blocking off flow of mixture from said second carburetor.