Apparatus for controlling a fuel injected engine driving a variable pitch propeller

Claim 2

Control apparatus for an internal combustion engine connected to drive a variable pitch propeller, said engine having: a. a governor adjustable to different speed settings and operable to vary the pitch of the propeller to maintain the actual speed of the engine substantially in agreement with a set speed, b. a fuel valve adjustable to different positions to regulate the rate of flow of fuel to the engine, and c. a throttle adapted to be set in different positions to regulate the flow of combustion air to the engine and to adjust the manifold pressure of the engine,

Claim 3

Control apparatus as defined in claim 1 in which said first means includes pressure-responsive means for sensing variations in the pressure of the ambient atmosphere.

Claim 4

Control apparatus as defined in claim 2 in which said pressure-responsive means cause said throttle to close when the density of the ambient atmosphere decreases as a result of a decrease in the pressure of the ambient atmosphere and in which said second means cause said throttle to open when manifold pressure decreases as a result of a decrease in the pressure of the ambient atmosphere, said pressure-responsive means and said second means being correlated with one another so the resultant effect of a given decrease in ambient pressure causes opening of said throttle but by a lesser amount than would be the case in the absence of said pressureresponsive means.

Claim 5

Control apparatus as defined in claim 1 in which said first means includes temperature-responsive means for sensing variations in the temperature of the ambient atmosphere and for causing said throttle to open when the temperature of the ambient atmosphere increases.

Claim 6

Control apparatus as defined in claim 1 in which said first means includes pressure-responsive means for sensing variations in the pressure of the ambient atmosphere and further includes temperature-responsive means for sensing variations in the temperature of the ambient atmosphere.

Claim 7

Control apparatus for an internal combustion engine connected to drive a variable pitch propeller, said engine having: a. a governor adjustable to different speed settings and operable to vary the pitch of the propeller to maintain the actual speed of the engine substantially in agreement with a set speed, b. a fuel valve adjustable to different positions to regulate the rate of flow of fuel to the engine, and c. a throttle adapted to be set in different positions to regulate the flow of combustion air to the engine and to adjust the manifold pressure of the engine,

Claim 8

Control apparatus for an internal combustion engine connected to drive a variable pitch propeller, said engine having: a. a governor adjustable to different speed settings and operable to vary the pitch of the propeller to maintain the actual speed of the engine substantially in agreement with a set speed, b. a fuel valve adjustable to different positions to regulate the rate of flow of fuel to the engine, and c. a throttle adapted to be set in different positions to regulate the flow of combustion air to the engine and to adjust the manifold pressure of the engine,

Claim 9

Control apparatus for an internal combustion engine connected to drive a variable pitch propeller, said engine having: a. a governor adjustable to different speed settings and operable to vary the pitch of the propeller to maintain the actual speed of the engine substantially in agreement with a set speed, b. a fuel valve adjustable to different positions to regulate the rate of flow of fuel to the engine, and c. a throttle adapted to be set in different positions to regulate the flow of combustion air to the engine and to adjust the manifold pressure of the engine,

Claim 10

Control apparatus for an internal combustion engine connected to drive a variable pitch propeller, said engine having: a. a governor adjustable to different speed settings and operable to vary the pitch of the propeller to maintain the actual speed of the engine substantially in agreement with a set speed, b. a fuel valve adjustable to different positions to regulate the rate of flow of fuel to the engine, and c. a throttle adapted to be set in different positions to regulate the flow of combustion air to the engine and to adjust the manifold pressure of the engine,

Claim 11

Control apparatus as defined in claim 7 further including means connected to said second control member and operable to disable said third means when said second control member is moved to a predetermined position.

Claim 12

Control apparatus as defined by claim 8 further including means movable by said first control member and operable to move said throttle when said third means are disabled and said first control member is moved.

Claim 13

Control apparatus as defined in claim 7 further including means causing said fuel to flow past said fuel valve with a predetermined constant pressure drop whereby the flow rate of said fuel is directly proportional to the position of said valve, said lastmentioned means being selectively adjustable to cause said fuel to flow past said valve with a different constant pressure drop whereby the flow rate of the fuel may be changed without changing the position of said valve, and a third control member connected to said lastmentioned means and operable to adjust the latter in response to being manually moved.