Control system for limiting overload and overrunning of an internal-combustion engine

Claim 2

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor including intake sectional area control means operated through diaphragm means by the vacuum in the air intake system of the engine, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a vacuum chamber carrying said diaphragm means, said solenoid valve having an opening which communicates with the vacuum chamber and having a valve body closing and opening said opening, and means for energizing said solenoid coil to open said opening for communicating said vacuum chamber to the atmosphere when the speed or power exceeds a predetermined limit, means incorporating said solenoid coil within a circuit including a switch which closes and opens said circuit, said switch being operatively coupled to the air intake system of the engine.

Claim 3

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor with primary and secondary barrels, each having a constant area venturi, a primary throttle valve mechanically coupled to an accelerator and a secondary throttle valve operatively coupled to a diaphragm means, means for coupling the vacuum air intake system to a vacuum chamber of the diaphragm means, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, a detector for detecting the speed of the engine, said solenoid valve having an opening communicating with said vacuum chamber of said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally close said opening, means operatively coupling said engine speed detector to said switch for closing said switch to energize said solenoid coil and draw said valve body against said spring when the speed of the engine exceeds a predetermined limit whereby; said vacuum chamber of said diaphragm means is connected to the atmosphere through said opening and said port to close said secondary throttle valve at that engine operation.

Claim 4

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor with primary and secondary barrels, each having a constant area venturi, a primary throttle valve mechanically coupled to an accelerator and a secondary throttle valve operatively coupled to a diaphragm means, means for coupling the vacuum air intake system to a vacuum chamber of the diaphragm means, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, a detector for detecting the speed of the engine, said solenoid valve having an opening communicating with said vacuum chamber of said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally close said opening, means operatively coupling said engine speed detector to said switch for closing said switch to energize said solenoid coil and draw said valve body against said spring when the speed of the engine exceeds a predetermined limit whereby; said vacuum chamber of said diaphragm means is connected to the atmosphere through said opening and said port to close said secondary throttle valve at that engine operation.

Claim 5

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor including primary and secondary barrels, each have a constant area venturi, a primary throttle vAlve for the primary barrel mechanically cooperated with an accelerator, and a secondary throttle valve for said secondary barrel operated through diaphragm means by directing the vacuum of the air intake system into the vacuum chamber of the diaphragm means, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which is operatively coupled to said secondary barrel to close and open said circuit in response to the vacuum of the engine, said solenoid valve having an opening which communicates with said vacuum chamber of said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to closed position whereby: said switch closes to energize said solenoid coil and draw said valve body against said spring when the vacuum of said second barrel exceeds a predetermined limit under heavy load engine operating conditions with operation of the diaphragm means shut off by communicating the vacuum chamber thereof with the atmosphere through the opening and the port with the secondary throttle valve closed at that engine operation.

Claim 6

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor including primary and secondary barrels, each have a constant area venturi, a primary throttle vAlve for the primary barrel mechanically cooperated with an accelerator, and a secondary throttle valve for said secondary barrel operated through diaphragm means by directing the vacuum of the air intake system into the vacuum chamber of the diaphragm means, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which is operatively coupled to said secondary barrel to close and open said circuit in response to the vacuum of the engine, said solenoid valve having an opening which communicates with said vacuum chamber of said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to closed position whereby: said switch closes to energize said solenoid coil and draw said valve body against said spring when the vacuum of said second barrel exceeds a predetermined limit under heavy load engine operating conditions with operation of the diaphragm means shut off by communicating the vacuum chamber thereof with the atmosphere through the opening and the port with the secondary throttle valve closed at that engine operation.

Claim 7

A control system for limiting overload and overrunning of an internal-combustion engine having a variable-area venturi type carburetor including a barrel, a throttle valve in the barrel mechanically coupled to an accelerator and a flow control assembly having a suction piston which defines a variable-area venturi between it and a bridge portion of a carburetor body, a first spring disposed to close the variable-area venturi by urging the suction piston and a port opening into a vacuum chamber behind the suction piston to operate the suction piston against the spring by the vacuum of the air intake system, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit having an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating with said vacuum chamber of said flow control assembly, a second port communicating with the atmosphere, a valve body closing and opening said opening and a second spring urging said valve body into normally closed position, said switch closing to energize said solenoid coil and draw said valve body against said second spring when the engine speed or power exceeds a predetermined limit whereby the vacuum within the vacuum chamber behind said suction piston is cancelled by communicating said vacuum chamber with the atmosphere through said opening and the second port to close said suction piston at that engine operation.

Claim 8

A control system for limiting overload and overrunning of an internal-combustion engine having a variable-area venturi type carburetor including a barrel, a throttle valve in the barrel mechanically coupled to an accelerator and a flow control assembly having a suction piston which defines a variable-area venturi between it and a bridge portion of a carburetor body, a first spring disposed to close the variable-area venturi by urging the suction piston and a port opening into a vacuum chamber behind the suction piston to operate the suction piston against the spring by the vacuum of the air intake system, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit having an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating with said vacuum chamber of said flow control assembly, a second port communicating with the atmosphere, a valve body closing and opening said opening and a second spring urging said valve body into normally closed position, said switch closing to energize said solenoid coil and draw said valve body against said second spring when the engine speed or power exceeds a predetermined limit whereby the vacuum within the vacuum chamber behind said suction piston is cancelled by communicating said vacuum chamber with the atmosphere through said opening and the second port to close said suction piston at that engine operation.

Claim 9

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor with primary and secondary barrels, each having a constant air venturi, a primary throttle valve mechanically coupled to an accelerator, a vacuum chamber including diaphragm means and means for operatively coupling the vacuum intake system to said vacuum chamber and a secondary throttle valve to said diaphragm means, said control system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating with said vacuum chamber of said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally closed position, and means responsive to a predetermined engine-operating state for closing said switch to energize said solenoid coil and draw said valve body against said spring, whereby; said vacuum chamber of said diaphragm means is connected to the atmosphere through said opening and said port to close said secondary throttle valve at said predetermined engine operation state.

Claim 10

A control system for limiting overload and overrunning of an internal-combustion engine having a carburetor with primary and secondary barrels, each having a constant air venturi, a primary throttle valve mechanically coupled to an accelerator, a vacuum chamber including diaphragm means and means for operatively coupling the vacuum intake system to said vacuum chamber and a secondary throttle valve to said diaphragm means, said control system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating with said vacuum chamber of said diaphragm means, a port communicating with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally closed position, and means responsive to a predetermined engine-operating state for closing said switch to energize said solenoid coil and draw said valve body against said spring, whereby; said vacuum chamber of said diaphragm means is connected to the atmosphere through said opening and said port to close said secondary throttle valve at said predetermined engine operation state.

Claim 11

A control system for limiting overloaD and overrunning of an internal-combustion engine having a carburetor including intake sectional area control means operated by the vacuum in the air intake system of the engine within a vacuum chamber of a vacuum-operated means, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating said vacuum chamber of said vacuum-operated means with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally close said opening, said switch closed to energize said solenoid coil and draw said valve body against said spring when the engine speed or power exceeds a predetermined limit whereby said vacuum chamber is connected to the atmosphere through said opening to close said intake sectional area control means at that engine state.

Claim 12

A control system for limiting overloaD and overrunning of an internal-combustion engine having a carburetor including intake sectional area control means operated by the vacuum in the air intake system of the engine within a vacuum chamber of a vacuum-operated means, said system comprising: solenoid valve means including a solenoid valve and a solenoid coil, a circuit including an electrical source, said solenoid coil and a switch which closes and opens said circuit, said solenoid valve having an opening communicating said vacuum chamber of said vacuum-operated means with the atmosphere, a valve body closing and opening said opening and a spring urging said valve body to normally close said opening, said switch closed to energize said solenoid coil and draw said valve body against said spring when the engine speed or power exceeds a predetermined limit whereby said vacuum chamber is connected to the atmosphere through said opening to close said intake sectional area control means at that engine state.