Ford Global Technolgoies, LLC

Yang Xu

Zhengyu Dai

Hong Jiang

Guopeng Hu

Weitian Chen

Sathish Atluri

Michael W Degner

Akshay Bichkar

Qi Wang

Hiral Jayantilal Haria

Ross Dykstra Pursifull

Ralph Wayne Cunningham

Jason Meyer

Jiyao Wang

Stuart N Ford

Ji Wu

Timothy L Sargent

Bradley Dean Riedle

Yuji Fujii

Wei Wu

Jonathan Hair

Adeeb Ahmed

Silong Li

Matthew Penne

Joseph Sherman Kimmel

Christoph Henel

Yingfeng Ji

David Peterson

A changed polarity complement of a first gate duty cycle command for a next cycle of a carrier wave is generated based on the first gate duty cycle command for a current cycle, the first gate duty cycle command for the next cycle, a second gate duty cycle command for the current cycle, and the second gate duty cycle command for the next cycle. A switch of an inverter is operated according to the changed polarity complement of the first gate duty cycle command.

Mitigation of motor line to line voltage reversal

Systems and methods for operating an electric drive system for an electric or hybrid vehicle is described. In one example, the drive system is operated by suppling a pulsed torque current command while supplying a zero flux current command. The torque current command and the flux current command make up winding current commands for an electric machine.

Methods and system for estimating electric machine position offset

A hybrid vehicle includes an engine, an electric machine, a disconnect clutch configured to selectively couple the engine to the electric machine, and a controller. The controller is programmed to, in response to a request to start the engine with the electric machine, command a target pressure to the disconnect clutch that depends on a seal friction derived from a measured line pressure of the disconnect clutch and a rate change of the measured line pressure.

Controls and methods to calculate clutch torque to include seal friction

A vehicle includes an electric machine including a rotor. The vehicle further includes a traction battery configured to supply electric power to the electric machine. The vehicle further includes a wheel mechanically coupled to the electric machine. The vehicle further includes one or more controllers programmed to, responsive to detecting a battery temperature below a threshold and the vehicle being parked, rotate the rotor to a preset position such that the wheel rotates.

Zero speed vehicle battery heating

An electric drive system is actively controlled while an electrified vehicle is being towed. The inverter switches are manipulated to preclude exceeding a maximum voltage of a DC bus and also to preclude exceeding a maximum phase current magnitude. During a transition from an inverter off state to a short-circuit state, field-oriented control is utilized.

Electrified vehicle motor control during tow

An electrified vehicle includes a traction battery, an inverter coupled to the traction battery via positive and negative legs of a high voltage bus and operable to convert DC power from the traction battery to three-phase AC power, a capacitor connected across the positive and negative legs of the high voltage bus, an electric machine having three phases coupled to the inverter, and a controller programmed to control electric machine voltage toward zero at a first slew rate or control electric machine current to a target short circuit current at a second slew rate in response to an active short request signal and to control the inverter to actively short the three phases of the electric machine after either (a) a specified elapsed time, or (b) after the electric machine voltage is below a first threshold or the current is within a predetermined range of the target short circuit current.

Transient current management of electric machine in an electrified vehicle

A method includes estimating a first pressure at a first location of a clutch based on a flow rate of a fluid in the clutch, computing a first torque lead value based on the first pressure, computing a second torque lead value based on a second pressure, computing a third torque lead value by combining the first torque lead value and the second torque lead value, and applying torque from a motor of the vehicle based on the third torque lead value.

Method and system for providing torque to clutch in hybrid vehicle

A vehicle includes an engine, an accelerator pedal, and a controller. The controller is programmed to command torque to the engine based on a set speed of adaptive cruise control and is programmed to, in response to the adaptive cruise control being active, a measured lateral acceleration of the vehicle exceeding a user-defined lateral acceleration threshold during a road curve, and the accelerator pedal being released, reduce a speed of the vehicle below the set speed until the measured lateral acceleration is less than the lateral acceleration threshold.

Adaptive cruise control with user-defined lateral acceleration threshold

A vehicle includes an electric machine, a battery, an inverter, and a controller. The controller switches the inverter at a switching frequency selected to generate an AC current to heat the battery, adjusts a d-axis current of the electric machine to increase a battery heating power, and adjusts a q-axis current of the electric machine according to the adjusted d-axis current.

System and method for resonant heating battery

A hybrid vehicle includes an electric motor and a combustion engine. A K0 clutch couples the combustion engine to a drivetrain of the vehicle. A control module of the vehicle calculates a torque to be applied by the motor to the K0 clutch when initiating engagement of the combustion engine to the drivetrain. The control module calculates two separate torque lead values by two separate methods and calculates the torque by combining the two torque lead values.

Systems and methods for operating a driveline of a vehicle that includes an automatic transmission and a torque converter are described. In one example, vehicle launch is controlled according to a linear quadratic regulator that provides feedback control according to torque converter slip error and vehicle speed error. The vehicle launch is also controlled according to feed forward control that is based on requested torque converter slip and requested vehicle speed.

Methods and system for controlling launch of a vehicle having an automatic transmission

A method of operating a vehicle includes, responsive to a command to launch the vehicle and while the vehicle is in a first gear, determining, at a controller, a feedforward component including a target engine torque and a target bypass clutch torque, and a feedback component that is based on an error between the target converter slip and a measured converter slip and between the target wheel torque and a measured wheel torque. The method further includes changing a commanded engine torque and a commanded bypass clutch torque based on the feedforward component and the feedback component.

Engine torque and torque converter bypass clutch slip control during vehicle launch

Systems and methods for reducing perception of transitions from shifting a transmission from neutral to drive are described. In one example, the transmission is shifted from neutral to drive in response to brake pedal motion before the brake pedal is fully released so that timing of pressurizing clutches and engaging a forward gear is advanced to occur while the brake pedal is still applied.

Methods and system for operating a vehicle

A vehicle includes a transmission, friction brakes, and a controller. The transmission has a clutch that is configured to transfer torque from an input of the transmission to a drive wheel. The controller is programmed to, in response to application of the friction brakes resulting in a stationary position of the vehicle, disengage the clutch to establish a neutral condition of the transmission. The controller is also programmed to, in response to a command to launch the vehicle while the transmission is in the neutral condition, engage the clutch. The controller is further programmed to, in response to an estimated wheel torque exceeding a rollback threshold during the clutch engagement, release the friction brakes. The wheel torque is based on an estimated clutch torque which is based on a clutch pressure and a transmission input torque.

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Dearborn, MI, United States of America

Yang Xu