Engine anti-diesel and deceleration control

Claim 2

A combination anti-dieseling and deceleration carburetor throttle valve position control comprising, in combination, an engine carburetor having an induction passage open to essentially atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from an essentially closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through said passage, and control means to move the throttle valve to the various positions, the control means including first means operatively biasing the throttle valve to a closed throttle anti-diesel position, engine manifold vacuum sensitive means operable during engine running to move the throttle valve to an open idle speed position, and other means operable in response to deceleration operaTion slowly returning the throttle valve towards the idle position to delay the return movement, the control means comprising a servo divided into an atmospheric pressure chamber and a vacuum chamber by a flexible diaphragm, and a plunger operably connected to the diaphragm and operably engagable with the throttle valve to move or be moved by the throttle valve, the other means comprising a dashpot including a sleeve sealingly secured to the diaphragm and projecting through the servo housing, a piston slidable within the sleeve and having the plunger secured thereto, the piston havng an air bleed port therein connecting opposite sides of the piston, and second spring means biasing the piston and plunger towards the throttle valve.

Claim 3

A combination anti-dieseling and deceleration carburetor throttle valve position control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from an essentially closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through said passage, and control means to move the throttle valve to the various positions, the control means including first means operatively biasing the throttle valve to a closed throttle anti-diesel position, the control means comprising a vacuum controlled servo having a shell divided into an atmospheric pressure chamber and a vacuum chamber by a flexible annular diaphragm, a sleeve sealingly secured at one end to the diaphragm in the vacuum chamber and projecting through the shell at the other end, a piston slidably and sealingly movable within the sleeve, a plunger fixed to the piston and projecting through and guided by the end of the sleeve in a frictionally engaging manner permitting communication of air to the one side of the piston, the piston having an orifice therein permitting the slow transfer of air from one side to the other delaying movement thereof during deceleration conditions, and second spring means biasing the piston and plunger outwardly of the shell, the plunger being operably engagable with the throttle valve whereby under no vacuum conditions at engine shutdown the throttle valve is moved to a closed posiion by unitary return movement thereof with the piston and unitary movement of the sleeve and disaphragm and piston by the first spring means.

Claim 4

A combination anti-dieseling and deceleration carburetor throttle valve position control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from an essentially closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through said passage, and control means to move the throttle valve to the various positions, the control means including first means operatively biasing the throttle valve to a closed throttle anti-diesel position, the control means comprising a vacuum controlled servo having a shell divided into an atmospheric pressure chamber and a vacuum chamber by a flexible annular diaphragm, a sleeve sealingly secured at one end to the diaphragm in the vacuum chamber and projecting through the shell at the other end, a piston slidably and sealingly movable within the sleeve, a plunger fixed to the piston and projecting through and guided by the end of the sleeve in a frictionally engaging manner permitting communication of air to the one side of the piston, the piston having an orifice therein permitting the slow transfer of air from one side to the other delaying movement thereof during deceleration conditions, and second spring means biasing the piston and plunger outwardly of the shell, the plunger being operably engagable with the throttle valve whereby under no vacuum conditions at engine shutdown the throttle valve is moved to a closed posiion by unitary return movement thereof with the piston and unitary movement of the sleeve and disaphragm and piston by the first spring means.