Fca US LLC

Lurun Zhong

Sandeep Makam

Konstantinos Siokos

Fadi A Estefanous

Yang Liang

Jiamu Hu

Tamer Badawy

Amit Shrestha

William P Attard

Andrew P White

Mitchell Ober

Sairam Chittoor

Jingjing Li

Abdullah-al Mamun

Singalandapuram Mahedevan Boopathi

Bei Jin

Chinmaya Mittal

Srikanth Jonnalagedda

Kaustabh Pethe

Techniques for managing wheel slip in a through-the-road hybrid vehicle comprise detecting a front wheel slip event based on measured rotational speeds of front wheels, determining a likelihood of a subsequent rear wheel slip event, when the front wheel slip event has ended and the likelihood of the subsequent rear wheel slip event satisfies a calibratable threshold, adjusting a front/rear axle torque split and pre-loading at least one of an engine and a belt-driven starter generator (BSG) unit coupled to a crankshaft of the engine to compensate for a torque drop that is predicted to occur during the rear wheel slip event, and re-adjusting the front/rear axle torque split and pre-unloading at least one of the engine and the BSG unit such that a drop in torque output at a front axle aligns with an end of the rear wheel slip event.

Predictive engine control methodology for managing wheel slip in through-the-road hybrid vehicles

Torque distribution control systems and methods for through-the-road electrified vehicles having distinct first and second torque generating systems for distinct first and second axles, respectively, utilize existing vehicle sensors to (i) obtain measured wheel rotational speeds and a measured steering wheel angle, (ii) estimate virtual yaw rates of the first and second axles using these measured values and other known vehicle parameters, (ii) predict whether oversteer or understeer of the vehicle is likely to occur based on the estimated first and second axle virtual yaw rates, and (iv) when oversteer or understeer of the vehicle is predicted to occur, adjust a torque distribution between the first and second torque generating systems to prevent the oversteer or understeer from occurring and to keep the vehicle on a constant turn path.

Torque distribution control to improve steering performance in through-the-road electrified vehicles

Time domain battery usage data of a battery of an electrified powertrain of a vehicle in terms of average SOC, DOD and a set including average current flow rate and average battery temperature for each charge-discharge full cycle and half cycle of the battery during a use period are used to identify a location in a 3-D storage matrix (of fixed size and predetermined discretization levels for each dimension) in memory of an electronic control unit and a count in that location incremented. In an aspect, the charge-discharge full cycles and half cycles are identified using four-point rainflow cycle counting.

On-board time-independent battery usage data storage

A system and method for controlling a hybrid power-split transmission of a vehicle involve obtaining measured rotational speeds of an engine and an electric motor of the transmission, wherein the transmission comprises at least two input shafts having a gear set therebetween and an output shaft, wherein one input shaft is coupled to the engine and another input shaft is connected to the electric motor, determining a main torque profile for the electric motor based on a set of operating conditions of the vehicle, calculating a speed difference between the measured rotational speeds of the engine and the electric motor, determining a disturbance torque profile for the electric motor based on the calculated speed difference, and performing closed-loop control of the electric motor based on a combination of the main and disturbance torque profiles to mitigate a disturbance at the output shaft of the transmission.

Disturbance mitigation techniques for hybrid power-split transmissions

An emissions control system for a vehicle having an exhaust system with an exhaust gas conduit and a catalytic converter configured to receive exhaust gas from an engine is provided. In one example implementation, the system includes an engine controller configured to control the engine to adjust an air to fuel ratio (lambda) thereof. The engine controller is configured to operate the engine with at least one of the following lambda control strategies (i) a first control strategy comprising operating at a first reference lambda modified by a first percent kick, and a first rich lambda lag time shorter than a first lean lambda lag time, and (ii) a second control strategy comprising operating at a second reference lambda modified by a second percent kick, and a second rich lag time longer than a second lean lambda lag time, to thereby simultaneously meet predetermined NOx and CO emissions targets.

Engine lambda dynamic control strategy for exhaust emission reduction

A turbocharger includes a housing, a turbine wheel, a bypass channel formed in the housing, a wastegate assembly having a valve and configured to selectively allow a flow of exhaust gas to bypass the turbine wheel via the bypass channel, and a wastegate outer housing having an aperture fluidly coupled to the bypass channel, and an outer valve seating surface, the valve configured to selectively seat against the outer valve seating surface over the aperture. A shroud extends outwardly from the wastegate outer housing and is configured to direct the bypass exhaust gas flow toward a catalytic converter.

Turbocharger wastegate assembly

Diagnostic systems and methods for detecting leaks in an exhaust gas recirculation (EGR) system of an engine of a vehicle utilize an upstream oxygen (O2) sensor disposed in an exhaust system of the engine upstream from an EGR port of the EGR system and configured to measure an upstream O2 concentration of exhaust gas produced by the engine, a downstream O2 sensor disposed in the exhaust system downstream from the EGR port and configured to measure a downstream O2 concentration of the exhaust gas, and a controller configured to receive the measured upstream and downstream O2 concentrations from the upstream and downstream O2 sensors, respectively, and detect a leak in the EGR system when a difference between the measured downstream and upstream O2 concentrations exceeds a diagnostic threshold.

Exhaust gas recirculation system leak diagnostics using upstream and downstream oxygen sensors

A system and method of utilizing a pre-turbine wide-range oxygen (WRO2) sensor during both individual cylinder fuel control (ICFC) and scavenging of a turbocharged engine involve receiving, by a controller and from the WRO2 sensor arranged in an exhaust system of the engine at a point upstream of a turbine of a turbocharger of the engine, an unfiltered WRO2 signal indicative of a fuel/air (FA) ratio of exhaust gas produced by the engine, performing, by the controller, ICFC by controlling the engine using the unfiltered WRO2 signal, performing, by the controller, engine cycle average filtering of the WRO2 signal to obtain a filtered WRO2 signal, and, while the engine is scavenging, performing, by the controller, engine FA ratio and emissions control using the filtered WRO2 signal.

Pre-turbine wide-range oxygen sensor lambda control during scavenging

A control system and method for a vehicle having a powertrain comprising a torque generating system and an automatic transmission each utilize a pedal position sensor configured to measure a position of an accelerator pedal of the vehicle and a controller configured to, based on the accelerator pedal position, detect a pedal tip-in or tip-out event and, in response to detecting the pedal tip-in or tip-out event: (i) determine a desired output torque for the torque generating system corresponding to the pedal tip-in or tip-out event and (ii) command the torque generating system to gradually transition, over a period, from its current output torque to the desired output torque to mitigate clunk caused by abrupt contact between gear teeth of the torque generating system shaft and the automatic transmission shaft.

Clunk mitigation techniques for pedal tip-in and tip-out events

An air intake system includes a plurality of intake runners configured to supply intake air to the engine, and an independent resonator system operably associated with the plurality of intake runners and including a plurality of individual resonator assemblies. Each individual resonator assembly is fluidly coupled to one intake runner of the plurality of intake runners. The plurality of individual resonator assemblies is configured to interact with at least one of sound and pressure waves generated in the engine to reduce engine noise and/or increase engine torque.

Growing community of inventors

Troy, MI, United States of America

Lurun Zhong