Ford Global Technolgoies, LLC

Fca US LLC

Chuanchi Tang

Chris Teslak

Cliff Carlson

Ron Kepner

Bradley Dean Riedle

Shuonan Xu

Pramod Kumar Jain

Ronald Thomas Cowan

James Merner

Howard Cecil Kuhn

Papeeha Thombare

Peter Chalk

Drushan Mayalankar

A predictive driver intention to stop (DITS) system for a vehicle having an engine includes one or more sensors configured to measure a set of operating parameters of the vehicle including at least (i) vehicle speed and (ii) vehicle deceleration rate. A controller is configured to identify no-stop braking events and complete stop braking events, and reference a generated baseline probability table indicating a probability of a driver braking to bring the vehicle to a stop, based on at least the vehicle speed and vehicle deceleration rate measured during at least one of the identified no-stop braking events and complete stop braking events. The controller is further configured to predict a DITS event based on the generated baseline probability table, and control operation of the engine based on the predicted DITS event to facilitate reducing vehicle fuel consumption and/or tailpipe emissions.

Prediction of driver's intention to stop for engine start/stop

A system for braking the wheels of a hydraulic hybrid vehicle includes a brake pedal having a range of pedal displacement including a deadband displacement range, an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, a pump/motor having variable volumetric displacement connected to the accumulator and reservoir, and driveably connected to the wheels; a system responsive to brake pedal displacement in the deadband range for placing the pump/motor in a pump state wherein the pump/motor is driven by the wheels and pumps fluid from the reservoir to the accumulator; and a control valve for changing the volumetric displacement of the pump/motor in response to displacement of the brake pedal.

Deadband regenerative braking control for hydraulic hybrid vehicle powertrain

A motor vehicle powertrain system according to this invention controls the magnitudes of torque produced by multiple power sources that drive the vehicle wheels. The system includes a source of pressurized fluid, and a pump/motor driveably connected to the wheels, which is driven in a motoring mode by fluid from the fluid source and has a variable volumetric displacement that changes in response to displacement of the accelerator pedal. An engine, driveably connected to the wheels, includes a throttle that opens and closes in response to displacement of the accelerator pedal. A controller controls operation of the engine and pump/motor such that they produce torque at various magnitudes. The system determines a magnitude of desired wheel torque, a maximum available engine wheel torque, a maximum available pump/motor wheel torque, a difference in magnitude between the desired wheel torque and the maximum available pump/motor wheel torque, operates the pump/motor as a motor such that the pump/motor produces a magnitude of wheel torque that is equal to the lesser of the desired wheel torque and the maximum available pump/motor wheel torque, and operates the engine such that the engine produces a magnitude of wheel torque that is equal to the lesser of the maximum available engine wheel torque and the difference in torque magnitude.

Controlling a hydraulic hybrid vehicle powertrain having an internal combustion engine and a hydraulic pump/motor

A system for transmitting power hydraulically to and from the wheels of a motor vehicle includes an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, and a pump/motor driveably connected to the wheels and having a variable volumetric displacement for pumping fluid between the accumulator and the reservoir. A first circuit connects the inlet to the reservoir and the outlet to the accumulator. A second circuit includes a first path having a low flow rate capacity, a second path having a higher flow rate capacity. A controller switches between pumping operation and motoring operation, opens and closes the first path during motoring operation, and reduces the displacement before switching between pumping operation and motoring operation.

Pump/motor operating mode switching control for hydraulic hybrid vehicle

A control strategy and method for controlling application and release of friction elements in an automatic transmission to effect gear ratio changes as one friction element is release and another friction element is applied during ratio changes. The transmission has an electronic controller and multiple solenoid regulator valves hydraulically coupled directly to pressure-operated friction elements. Powertrain variables are obtained and processed to calculate gear ratio control parameters derived from desired line pressure for a pressure control valve circuit that communicates with the friction elements. The desired gear ratio is determined for each given set of powertrain variables. Upshifts and downshifts are obtained by releasing one friction element in synchronism with an application of the other friction element, whereby a direct friction element to friction element torque transition is achieved with minimal inertia torque disturbances.

Control strategy and method for independently controlling friction element actuators for an automatic transmission

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Troy, MI, United States of America

Chuanchi Tang