Fca US LLC

Drushan Mavalankar

Chunjian Wang

Hussein A Dourra

Ethan E Bayer

Gang Chen

John R Bucknell

Alexander J George

Gregory T Weber

Shuonan Xu

Christopher A Tuckfield

Ryan C Masters

Sangeeta Theru

Barry A Mason

Papeeha Thombare

Nandanshri Bagadi

Vivek Jairazbhoy

Nicholas Hansen

Aymail Ismail

Andre Lorico

Dynamic slip target control systems and method for a multi-motor electrified powertrain of an electrified vehicle including a driveline having four wheels involve determining (i) a steering angle of the driveline of the electrified vehicle, (ii) a vehicle speed of the electrified vehicle, and (iii) a wheel speed of each the four wheels of the driveline, dynamically determining a target wheel slip based on a wheel speed model with inputs including the steering angle and vehicle speed, determining an expected differential speed based on the dynamically determined target wheel slip, determining a torque bias adjustment based on a difference between wheel speed errors and the expected differential speed, and controlling two or more electric motors of the multi-motor electrified powertrain based on an estimated torque bias and the torque bias adjustment.

Techniques for dynamic wheel slip target control in multi-motor electrified vehicles

A method of developing a control strategy for a thermal management system. The method includes decomposing a thermal management circuit defined by a plurality of secondary circuits that are each in fluid communication with each other into a plurality of sub-loops, the fluid communication between each of the secondary circuits and thermal management of the thermal management circuit being controlled by a plurality of actuators; determining at least one global thermal function associated with the thermal management circuit; after determining the at least one global thermal function associated with the thermal management circuit, determining an actuator mode capable of achieving the at least one global thermal function wherein the actuator mode is a collection of states of each of the plurality of actuators in the thermal management circuit; and forming at least one control algorithm for the thermal management circuit based on the actuator mode.

Method of developing a control strategy for a vehicle thermal management system, and vehicle thermal management system

Proprioceptive torque distribution control systems and methods for an electrified vehicle having a multi-motor electrified powertrain including two or more electric motors involve an accelerometer sensor system configured to measure accelerations of the electrified vehicle relative to three perpendicular axes, and a controller configured to determine four relative degrees of contact by four wheels of the electrified vehicle with a ground surface, respectively, based on the measured accelerations and travel of a suspension of the electrified vehicle, and control a distribution of a total amount of drive torque generated by the multi-motor electrified powertrain between the four wheels of the electrified vehicle based on their respective four relative degrees of contact with the ground surface to thereby improve performance and stability of the electrified vehicle.

Techniques for proprioceptive torque distribution control in multi-motor electrified vehicles

A control system that controls speed of an internal combustion engine (ICE) in a series hybrid vehicle includes an accelerator pedal, a vehicle speed sensor and a controller. The accelerator pedal sends a torque request signal. The vehicle speed sensor sends a vehicle speed signal. The controller receives the torque request signal and the vehicle speed signal. The controller is configured to calculate, based on the torque request and vehicle speed signals, a driver power request; calculate engine power limits including (i) a maximum engine power that includes the driver power request plus an upper offset; and (ii) a minimum engine power that includes the driver power request minus a lower offset; select a most efficient engine operating point between the maximum and minimum power; and control the ICE to operate at the most efficient engine operating point.

Series hybrid engine control with driverpower following

Rolling engine start-stop (RESS) system and methods for a vehicle include a set of sensors configured to measure a set of operating parameters of the vehicle comprising at least (i) driver input via brake pedal of the vehicle, (ii) vehicle speed, and (iii) a steering angle of the vehicle and a controller configured to, based on the set of operating parameters, determine a target vehicle speed for stopping an engine of the vehicle, and based on the steering angle of the vehicle, selectively stopping the engine of the vehicle when the vehicle speed falls to the determined target vehicle speed, wherein stopping the engine of the vehicle at the determined target vehicle speed decreases noise/vibration/harshness (NVH) caused by stopping the engine.

Robust control of rolling engine start-stop

A system and method for controlling condensation formation in an engine having EGR and forced induction includes a controller for determining a water vapor mass fraction of an exhaust stream based on a water vapor mass fraction of an intake stream and water vapor from combustion. An estimated condensation temperature (CT) is determined for a current EGR level based on the water vapor mass fractions and is compared to an intake stream temperature upstream of the compressor inlet. The controller commands the current EGR level as a maximum EGR level upon determining the intake stream temperature is less than the CT, and an increase in the current EGR level upon determining the intake stream temperature is greater than the CT. An air charge temperature (ACT) of the forced induction system may be controlled based on utilizing a target ACT as the CT to be controlled by a coolant pump.

Engine condensation control system and method

A control technique for an engine having a two-step variable valve lift system includes a controller receiving a pressure in an intake manifold of the engine from a manifold absolute pressure (MAP) sensor and a position of an EGR valve of the engine from an exhaust gas recirculation (EGR) sensor. In response to the controller detecting an upcoming HL-to-LL valve state transition, a set of airflow actuators of the engine is controlled, based on the intake manifold pressure and the EGR valve position, to generate a first torque reserve. In response to generating the first torque reserve, the controller then commands the HL-to-LL transition and depletion of the first torque reserve during the HL-to-LL transition to mitigate torque disturbance associated with this transition.

Two-step valvetrain preposition control strategy

Methods and systems for metering at least one EGR valve to a position determined to pass a desired EGR flow for a given set of engine characteristics. The methods include determining the EGR valve position based on pipe flow characteristics, or determining the EGR valve position based on pipe flow characteristics when differential pressure across the EGR valve is less than a pressure threshold.

EGR flow metering systems and methods

A system and method for controlling an exhaust gas recirculation valve during transient cycles of engine operation to improve fuel consumption efficiency. The system and method includes first determining a flow rate of total mass out of the intake manifold of the combustion engine and the current mass fraction of exhaust gas in the intake manifold of the combustion engine, calculating a mass flow rate for exhaust gas into the intake manifold that is based on the flow rate of total mass out of the intake manifold and the current mass fraction of exhaust gas in the intake manifold, and actuating a control valve to a position based on the calculated mass flow rate for exhaust gas into the intake manifold.

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Rochester Hills, MI, United States of America

Drushan Mavalankar