A system for positioning an engine control element has a sensor measuring a value corresponding to the actual position of the element, a reference providing a command value establishing the proper position for the element, an electronic control which compares the measured value with the command value, and an actuator including a fluid pressure responsive motor for moving the element and a pressure regulator directed by the electronic control to regulate the fluid pressure delivered to the motor and cause the motor to move the control element to the proper position. The pressure regulator has a coil energized by the electronic control and a valve member which floats between a regulated-pressure-reducing bias caused by the magnetic flux created in the coil and a regulated-pressure-increasing bias caused by a varying but uncontrolled pressure differential.

Electronic engine control system and method of operation

Systems and methods for electronically controlling the fuel-to-air ratio of a fuel mixture supplied to an internal combustion engines are disclosed. In one aspect, electronic control systems and methods are provided that determine and automatically move a choke valve in accordance with a first ramp having a first characteristic that is dependent on engine temperature and ambient air temperature. In another aspect, an integrated ignition and electronic auto-choke module is provided. In yet another aspect, electronic control systems and methods are provided that dynamically control a movement characteristic of a choke valve using a feedback loop.

Systems and methods for electronically controlling fuel-to-air ratio for an internal combustion engine

A choke breaker system for a carburetor of an internal combustion engine, wherein a negative pressure-type choke control means of a carburetor of an internal combustion engine is directly coupled with a vacuum port of the carburetor, a vacuum switching valve being controllable in response to an engine temperature and a negative pressure check valve are arranged in the passage of negative pressure, and only the vacuum switching valve is to be connected in series when the temperature of the engine is below a certain level, while the vacuum switching valve and the check valve are to be both connected in series when the temperature of the engine is in excess of the certain level.

Choke breaker system for a carburetor of an internal combustion engine

A carburetor equipped with an auto-choke device is disclosed wherein according to one embodiment a leak valve is disposed in a negative pressure chamber of a diaphragm device adapted to operate by a negative pressure in a suction passage downstream of a throttle valve so as to open a choke valve in said suction passage to a predetermined degree of opening (complete explosion opening) after an engine has rotated by itself, and when the diaphragm has executed a predetermined shift, the leak valve is opened, and simultaneously, the downstream of the leak valve is brought into the atmospheric pressure for engine temperatures below a set value and into the same negative pressure as that of the negative pressure chamber for engine temperatures at and above the set value, whereby the operating stroke of the diaphragm is changed-over in two stages in dependence upon the water temperature or oil temperature, and the complete explosion opening of the choke valve is changed-over in two stages so that it may become narrow when the water temperature or oil temperature is low and wide when it is high.

Carburetor equipped with an auto-choke device

In a vacuum motor for opening an internal combustion engine carburetor choke to a vacuum break position, a stop is engaged between the actuating diaphragm and a base member to establish the vacuum break position. The stop is formed of a malleable material which plastically deforms slightly upon engagement--and thus gradually changes the vacuum break position upon repeated engagement--to compensate for changes in engine operating characteristics over an extended period of engine operation.

Malleable stop for engine control element

A mechanism is provided whereby the opening of an automatic choke valve is controlled by means of pressure in a diaphragm chamber with the chamber being selectively communicated with a vacuum pickup tube or an atmospheric pressure pickup tube through operation of a solenoid controlled valve. A switch actuatable in response to vehicle speed and another switch actuatable in response to engine temperature operate to selectively connect the solenoid controlled valve to a power source thereby to determine the operating mode of the valve.

Hirohumi Matsumoto

Papers

Choke control system for carburetors