Split torque transmission control
AssigneeSundstrand Corporation
InventorsThomas R. Fulkerson, Royal R. Hawkins
Life of this patent
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Abstract
For use on a vehicle having a split torque transmission, the split torque transmission including first and second throughputs and a summing junction connected to the first and second throughputs and having a transmission output dependent upon the first and second throughputs, each throughput having an input connected to an output of the engine of the vehicle, the system including a sensor adapted to sense the output of the engine, and a controller connected to the sensor and adapted to control the second throughput dependent upon the engine output, the second throughput being controlled from a negative value cancelling the first throughput to a positive value so that the transmission output is varied from idle to a predetermined value.
Claims20
A system for controlling a split torque transmission of a vehicle comprising, the split torque transmission including first and second throughputs and a summing junction connected to the first and second throughputs and having a transmission output dependent upon said first and second throughputs, each throughput having an input connected to an output of an engine of the vehicle,
- sensing means adapted to sense the output of said engine;
- and
- control means connected to said sensing means and adapted to control said second throughput solely dependent upon said engine output, said second throughput being controlled from a negative value cancelling said first throughput to a positive value so that said transmission output is varied from idle to a predetermined value.
A system for controlling a split torque transmission of a vehicle, said split torque transmission including mechanical and hydrostatic throughputs and a summing junction connected to the mechanical and hydrostatic throughputs and having a transmission output based upon said mechanical and hydrostatic throughputs, each throughput having an input connected to an output of an engine of the vehicle, said hydrostatic throughput having a pump connected to the output of the engine for supplying hydraulic fluid to a hydraulic motor,
- sensing means adapted to sense the output of said engine;
- and
- control means connected to said sensing means and adapted to control the hydrostatic throughput solely dependent upon said engine output, said hydraulic throughput being controlled from a negative value cancelling said mechanical throughput to a positive value whereby said transmission output is varied from an idle to a predetermined level.
A split torque transmission and control for a vehicle including an engine, said split torque transmission including a mechanical throughput driven by said engine, a hydrostatic throughput driven by said engine, a summing junction connected to both said mechanical and said hydrostatic throughput and providing a transmission output based upon said mechanical and hydrostatic throughputs, said hydrostatic throughput including a variable displacement pump driven by said engine and hydraulically connected to a hydraulic motor connected to said summing junction, the output of said variable displacement pump being controlled from a maximum negative value to a maximum positive value, speed sensing means connected to the output of said engine for sensing the speed thereof to provide a control signal, control means operated solely by said control signal and adapted to control the displacement of said variable displacement pump so that the output of said hydrostatic throughput is at said maximum negative value when said engine is at idle, said maximum negative value of said hydrostatic throughput being sufficient to cancel said mechanical throughput so that the transmission output of said summing junction is zero when said engine is at idle, said control means being operated by said control signal when said engine speed is increased from idle to increase the displacement of said hydrostatic throughput from said maximum negative value toward said maximum positive value to thereby increase the transmission output of said summing junction from zero.
Dependencies are inferred from the claim text.