Start control

A control system for a multi-ratio transmission connectable at its input to a prime mover in response to fluid pressure actuation of at least one of a plurality of ratio-selecting clutches and at its output to a load, said system comprising;

• manually moveable throttle means having an idle position and operative to increase the speed of said prime mover in response to manual movement away from said idle position;
• a source of pressurized fluid;
• passage means for connecting said source to said plurality of clutches;
• manually moveable selector means having an inactive position and a plurality of active positions which each correspond to one of the transmission ratios;
• first means actuated in response to manual movement of said throttle means away from said idle position;
• valve means associated with said passage means and operative to allow actuation of at least one of said clutches by allowing flow of said pressurized fluid to said at least one of said clutches in response to movement of said selector to an active position corresponding to said at least one of said clutches and actuation of said first means.

In a wheeled land vehicle a control system for a multi-ratio transmission connectable at its input to a prime mover in response to fluid pressure actuation of at least one of a plurality of ratio-selecting, friction clutches and at its output to wheels of said vehicle, said control system comprising:

• manually moveable throttle means having an idle position and operative to increase the speed of said prime mover in response to manual movement of said throttle means away from said idle position.
• a source of fluid
• passage means for connecting said source to said plurality of clutches;
• pressure regulating means responsive to the position of said throttle means for increasing the pressure of said fluid in said passage means in proportion to manual movement of said throttle away from said idle position;
• manually moveable selector means having an inactive position on a plurality of active positions which each correspond to at least one of said ratio-selecting clutches;
• first means actuated in response to manual movement of said throttle means away from said idle position;
• valve means associated with said passage means and operative to allow actuation of at least one of said clutches by allowing flow of said pressure regulated fluid to said at least one of said clutches in response to movement of said selector to a corresponding active position and actuation of said first means;
• low speed governor means responsive to the speed of said prime mover for preventing a decrease in said prime mover speed below a predetermined minimum and for increasing the torque transmitting capacity of said prime mover and accelerating said vehicle to a speed corresponding to at least the minimum prime mover speed.

In control means for a multi-speed transmission, connectable at its input through at least one selected one of a plurality of friction clutches to an engine and connected at its output to a load, comprising in combination:

• a manual throttle connection to engine fuel control means;
• a pressure regulator responsive to the position of said manual throttle connection to said engine fuel control means so that a progressively more fuel position of said throttle connection corresponds to a progressively greater development of pressure by said pressure regulator;
• a plurality of valves, including control devices for each thereof and means including said pressure regulator for connecting of source of pressure to each of said valves whereby one condition of each of said valves will cause same to conduct such pressure to one of said clutches for engaging same and the other condition of said valves will effect deenergization of said one of said clutches;
• control means effecting energization of a selected one of said valves for connecting said pressure to a selected one of said clutches;
• and
• a pair of parallel connected power transmitting devices, one thereof being conditioned to cause opening of said selected transmission clutch when the throttle is near its idling position and to effect closing of such clutch when the throttle control moves away from its idling position and the other of said devices being responsive to the speed of the vehicle in such a manner as to place said clutch in power transmitting condition when the output speed of the transmission is in excess of a predetermined value and to place said transmission in non-power transmitting condition when the output speed of the transmission is less than said predetermined value.

In control means for a multi-speed transmission, connectable at its input through at least one selected one of a plurality of friction clutches to an engine and connected at its output to a load, comprising in combination:

• a manual throttle connection to engine fuel control means;
• a pressure regulator responsive to the position of said manual throttle connection to said engine fuel control means so that a progressively more fuel position of said throttle connection corresponds to a progressively greater development of pressure by said pressure regulator;
• a plurality of valves, including control devices for each thereof and means including said pressure regulator for connecting a source of pressure to each of said valves whereby one condition of each of said valves will cause same to conduct such pressure to one of said clutches for engaging same and the other condition of said valves will effect deenergization of said one of said clutches;
• and
• a minimum speed governor responsive to the output speed of said engine and means connecting same to said engine fuel control means for increasing said engine fuel independent of said manual throttle connection when said engine speed drops below a predetermined speed due to increased load appearing at the output of said transmission.