Methods and systems are provided for operating a hybrid vehicle during launch conditions from rest. In one example, a driver demand torque is held constant until a threshold vehicle speed is reached when a constant accelerator pedal position is present so that closing of a transmission input clutch may result in reduced driveline torque disturbances while a desired driver demand torque is delivered.

Methods and systems are provided for controlling a distribution between engine and motor torques for a hybrid electric vehicle operating in a creep mode of operation in response to an engine start request. In one example, responsive to a request to start an engine while a vehicle is being propelled at a predetermined wheel creep torque via an electric motor positioned downstream of a transmission and a torque converter, coordinating an electric motor torque and an engine torque in one of a first mode, second mode, or a third mode depending on whether the electric motor can continue to provide the predetermined wheel creep torque. In this way, engine idle speed may be minimized depending on vehicle operating conditions, which may improve fuel economy.

Systems and methods for operating a vehicle driveline that includes an engine and an electric machine are described. In one example, an amount of electrical power that is available to electrical consumers that are electrically coupled to a high voltage bus is adjusted responsive to a temperature of a catalyst for the purpose of reducing engine emissions.

Systems and methods for operating a vehicle driveline that includes an engine and an electric machine are described. In one example, an amount of electrical power that is available to electrical consumers that are electrically coupled to a high voltage bus is adjusted responsive to a temperature of a catalyst for the purpose of reducing engine emissions.

A control system (208) for enabling deactivation of vehicle creep in a vehicle (10) with an engine (202), the control system (208) comprising one or more controllers (300), wherein the control system (208) is configured to: enable vehicle creep (402) so that wheel drive torque can reach a first value greater than zero without a driver load request and without a brake request, wherein enabling vehicle creep comprises the engine (202) being active while connected to a vehicle wheel (FL, FR); monitor for a vehicle creep deactivation signal (404); and in response to the vehicle creep deactivation signal (404), inhibit vehicle creep (412) so that wheel drive torque cannot reach the first value without a driver load request, and wherein inhibiting vehicle creep comprises causing disconnection (414) of the engine (202), at least in part, from the vehicle wheel (FL, FR).

A method is provided for operating a drive train comprising an internal combustion engine or an electric machine as a primary drive and an electric machine as a secondary drive, wherein the electric machine is detachably coupled, together with an inverter and controller, on one of the vehicle axles. The electric machine and at least one switchable element is actuated in order to minimize drag losses of the electric machine and to provide a defined connection time for the electric machine. The electric machine is stationary and decoupled during a first speed range. The electric machine is actuated at a preset speed during a second speed range, where a defined connection time is not possible if the electric machine were stationary. The electric machine is coupled to the axle and rotates at the vehicle speed in the third range, when losses while coupled are lower than if uncoupled.

A vehicle control system increases the travel distance of a vehicle by inhibiting reduction in the SOC of a battery even when the output of an engine is limited. The control system is characterized by comprising: an electric motor that drives a vehicle: an engine that drives a power generator that generates electric power to be supplied to the electric motor; a battery that is configured to be chargeable by the power generator and that is electrically connected to the electric motor; and a controller that controls the electric motor.

The present disclosure refers to an all-wheel drive system (10) for a vehicle (12), comprising: an electrical motor (24) being connected to a first axle (26) of a planetary gear set (28) arranged at an output side (30) of a vehicle gearbox (32), and a second axle (34) of the planetary gear set (28) being connected or connectable to the gearbox output shaft (36) or to ground (G) by a coupling (I), while a third axle (38) of the planetary gear set (28) is connected or connectable to the front axle (14) of the associated vehicle (12); and further to an all-wheel drive system (10) for a vehicle (12), comprising: a differential (56) arranged between a vehicle gearbox (32) and a front (14) and rear axle (16) of an associated vehicle (12), a first planetary gear set (28) having a planetary gear set output (58) being connected to one of the differential outputs (60), and a second planetary gear set (62) having a planetary gear set output (64) being connected to the other one of the differential outputs (68), wherein said first (28) and second planetary gear set (62) are sharing a common ring wheel (44), and an electrical motor (24) is electively connectable to one of the planetary gear sets (28) or to a gearbox output shaft (36) by means of a coupling (I).

A power regeneration system of a work vehicle includes: a first generator (12) and a second generator (31) that are driven by an engine (11); a first electric circuit (C1) for supplying electric power to traveling motors (10L, 10R); a second electric circuit (C2) for supplying electric power to an auxiliary device (35); a voltage step down converter (21) providing electric power from the first electric circuit to the second electric circuit; and a controller (51) that determines whether a travel mode of the work vehicle is a powering mode or a regeneration mode in order to control driving of the voltage step down converter. If the travel mode is the regeneration mode, the controller provides the regenerative power from the first electric circuit through the voltage step down converter to the second electric circuit, in order to drive the auxiliary device with the regenerative power.

A through the road (TTR) hybridization strategy is proposed to facilitate introduction of hybrid electric vehicle technology in a significant portion of current and expected trucking fleets. In some cases, the technologies can be retrofitted onto an existing vehicle (e.g., a truck, a tractor unit, a trailer, a tractor-trailer configuration, at a tandem, etc.). In some cases, the technologies can be built into new vehicles. In some cases, one vehicle may be built or retrofitted to operate in tandem with another and provide the hybridization benefits contemplated herein. By supplementing motive forces delivered through a primary drivetrain and fuel-fed engine with supplemental torque delivered at one or more electrically-powered drive axles, improvements in overall fuel efficiency and performance may be delivered, typically without significant redesign of existing components and systems that have been proven in the trucking industry.