A method and a system for control of a torque Tq.sub.demand requested from an engine in a vehicle, wherein the engine provides a dynamic torque Tq.sub.fw in response to the torque Tq.sub.demand. Control of the requested torque Tq.sub.demand is performed such that the control provides a desired value Tq.sub.fw.sub._.sub.req for the dynamic torque and/or a desired derivative Tq.sub.fw.sub._.sub.req for the dynamic torque. This is achieved by basing the control on at least one current value Tq.sub.fw.sub._.sub.pres for the dynamic torque, on one or several of the desired value Tq.sub.fw.sub._.sub.req and the desired derivative Tq.sub.fq.sub._.sub.req for the dynamic torque, and on a total delay time t.sub.delay.sub._.sub.total elapsing from determination of at least one parameter value, to when a change of the dynamic torque Tq.sub.fw based on the determined at least one parameter value, has been effected.

A hybrid vehicle uses a first motor, a second motor and an engine as driving force sources and includes a gear transmission mechanism and an oil supply mechanism. The gear transmission mechanism transmits torque, output from the first motor, to a drive shaft side. The oil supply mechanism is driven by power other than power of the engine to supply oil to the gear transmission mechanism. When the hybrid vehicle is caused to travel by using the torque output from at least the first motor in a state where operation of the engine is stopped, and when an estimated amount of oil that is supplied from the oil supply mechanism to the gear transmission mechanism is smaller than or equal to a predetermined amount, an electronic control unit limits an operation state of the first motor such that load on the gear transmission mechanism decreases.

A drive device for a motor vehicle includes a primary powertrain and a secondary powertrain, wherein the primary powertrain includes a combustion engine for generating a total torque; a torque distribution device coupled to the combustion engine and including a first and a second output, wherein the torque distribution device is designed to provide a first partial torque in mechanical form at its first output derived from the total torque, and to provide a second partial torque in electrical form at its second output derived from the total torque; and a transmission which is coupled to the first output of the torque distribution device; wherein the secondary powertrain includes an electric machine which is coupled to the second output of the torque distribution device; wherein the torque distribution device includes a torque limiting device which is designed to limit the first partial torque to a presettable threshold value.

Systems and methods for improving launching of a stopped hybrid vehicle are presented. The systems and methods adjust speed of a motor to reduce the possibility of noticeable impact between driveline gears during vehicle launch. In one example, motor speed is adjusted to a pump pressurization speed where driveline components may be moved to reduce impact between driveline gears during vehicle launch.

An engine stop control method of a power split-parallel hybrid electric vehicle (HEV) system may include: determining any one driving mode among an EV mode, a power split mode and a parallel mode, corresponding to a driver's request; recognizing and deciding whether the driving mode is a mode required to stop an engine; stopping the engine; and performing kill torque (TQ) control on the revolution speed of the engine through a motor so that the revolution speed of the engine reaches 0 rpm. Accordingly, the revolution speed of the engine can be reduced down to an rpm lower than that of the conventional art, thereby promoting fast mode conversion.

A method for preventing damage to a driving system in vehicles may include determining whether a 4-wheel drive vehicle turns based on a steering angle signal, determining, based on an accelerator opening rate signal of the vehicle, whether a maximum torque causing damage to front wheel driveshafts is produced, checking a bump stroke amount of the vehicle and determining whether the front wheel driveshafts are likely to be damaged by a maximum torque transferred to the front wheel driveshafts when the vehicle turns, and lowering, when the front wheel driveshafts are likely to be damaged, a maximum torque of a 4-wheel drive torque applied to the front wheel driveshafts.

A method for automatically controlling vehicle speeds of a track-based work vehicle may generally include receiving, with a computing device, one or more signals associated with an operating temperature for a track component of a track assembly of the track-based work vehicle, comparing, with the computing device, the operating temperature for the track component to a predetermined temperature threshold defined for the track component and automatically limiting, with the computing device, a vehicle speed of the track-based work vehicle when the operating temperature for the track component exceeds the predetermined temperature threshold.

A control device controlling a hybrid vehicle provided with a planetary gear mechanism including a first gear connected to a first rotary electric machine, a carrier connected to an engine shaft of an internal combustion engine, and a second gear connected to a drive shaft to which a second rotary electric machine is connected and a rotation blocking mechanism blocking the rotation of the engine shaft in the other direction adjusts the ratio of a first torque to a total torque based on the result of the determination of whether or not the temperature of a first gear mechanism satisfies a desired condition in a case where the hybrid vehicle travels in a dual drive traveling mode in which the hybrid vehicle travels by using both the first torque output by the first rotary electric machine and a second torque output by the second rotary electric machine in a state where the internal combustion engine is stopped.

A method and device for controlling a hybrid starter generator (HSG) of a hybrid electric vehicle (HEV)can distinguish a section in which tension influencing durability of a belt connected between an internal combustion engine and the HSG increases, and another section in which the tension decreases, in order to restrict a change in torque of the HSG connected to the belt.

When a required drive force of an engine becomes equal to or greater than a predetermined value that deteriorates the characteristics of an engine mount, torque serving as a required drive amount of a rear electric motor is increased, so that the required drive force of the engine can be reduced. As a result, crushing of the engine mount that supports the engine is reduced, so that engine vibration transmitted to a vehicle body via the engine mount can be reduced.