An oil supply system of an automatic transmission includes a reservoir (1) for accommodating and storing a liquid operating medium (6), a volume compensation tank (102), and a valve device (20) for establishing or interrupting a hydraulic connection (3) between the volume compensation tank (102) and the reservoir (1). The volume compensation tank (102), in the installed position of the automatic transmission, is arranged above the reservoir (1). The hydraulic connection (3) between the volume compensation tank (102) and the reservoir (1) is automatically establishable or interruptable by the valve device (20) as a function of a temperature. The valve device (20) is configured such that the temperature at which the valve device (20) is in the open condition is lower than the temperature at which the valve device (20) is in the closed condition and, thereby, the hydraulic connection (3) is at least partially interrupted.

Transmission systems, control systems for vehicles, and methods of operating vehicles are disclosed herein. A transmission system for a vehicle includes a transmission and a heat exchanger. The transmission is configured to receive rotational power supplied by a drive unit and provide the rotational power to a load in use of the transmission system. The heat exchanger is fluidly coupled to the transmission and configured to cool a sump of the transmission to manage transmission oil temperature in use of the transmission system. The transmission includes a control system having a plurality of sensors and a controller coupled to the plurality of sensors that has a processor and a memory device coupled to the processor.

A vehicle includes: an electric motor; and a temperature-control circuit through which a non-conductive temperature-control medium for temperature control for the electric motor circulates. The temperature-control circuit includes: a heat exchanger configured to exchange heat between the non-conductive temperature-control medium and a conductive temperature-control medium; and a pump driven in accordance with driving of the vehicle to circulate the non-conductive temperature-control medium. The temperature-control circuit further includes a liquid pressure holding unit configured to hold liquid pressure of the non-conductive temperature-control medium in the heat exchanger equal to or higher than a predetermined pressure.

A hydraulic controlling system including: a cooling and lubricating oil line and a main controlling oil line; an oil-liquid storage; a first pump, wherein an inlet of the first pump is connected to the oil-liquid storage and an outlet of the first pump is connected to the main controlling oil line; a second pump, wherein an inlet of the second pump is connected to the oil-liquid storage and an outlet of the second pump selectively communicates with the cooling and lubricating oil line or the main controlling oil line; and a gearbox-gear-shifting oil line including a gear-shifting-pressure regulating valve, a plurality of gear-shifting-flow-rate controlling valves and a plurality of gear-shifting selector valves. The gear-shifting-flow-rate controlling valves are connected to the main controlling oil line via the gear-shifting-pressure regulating valve. At least some of the gear-shifting-flow-rate controlling valves are connected to a gear-shifting executing piston via the gear-shifting selector valves.

A vehicle includes a gear mechanism connected to a driving wheel; a traveling electric motor configured to exchange heat with a heat exchange medium shared by the gear mechanism and output motive power to the driving wheel via the gear mechanism; and a controller configured to change an operating point of the traveling electric motor to a stronger field side rather than a maximum efficiency point in a case that a temperature of the heat exchange medium is less than a predetermined temperature.

An intelligent work vehicle preheating system includes an electric drive subsystem containing a battery pack, a hydraulic subsystem containing a first hydraulic fluid (HF) heating device, and a first HF temperature sensor. A memory stores a first minimum target temperature at or above which a first hydraulic fluid body contained in the hydraulic subsystem is desirably maintained. A controller architecture selectively places the intelligent work vehicle preheating system in an off-duty preheat mode when the electric drive subsystem is connected to an external power supply utilized to charge the battery pack. The controller architecture further controls the HF heating device to heat the first hydraulic fluid body when (i) the intelligent work vehicle preheating system is placed in the off-duty preheat mode, and (ii) the current temperature of the first hydraulic fluid body is less than the first minimum target temperature.

A thermostatic valve includes: a valve body in which a chamber is provided, an end cap assembly, a thermal actuator and a first spring mounted in the chamber. The valve body is provided with at least three ports in communication with outside; the thermal actuator includes a valve rod and a body portion, the chamber includes a first chamber and a second chamber; one end of the thermal actuator abuts against or indirectly abuts against or supports an end of the first spring close to the thermal actuator, and another end is limited to the end cap assembly; and the thermostatic valve is further provided with a guide portion in the chamber, the thermal actuator includes a guide fitting portion fitting with the guide portion, and the guide portion is slidably fitted with the guide fitting portion. The thermal actuator of the thermostatic valve is not shaken heavily.

A heat exchange device includes a heat exchanger body and a thermostatic assembly; the heat exchanger body includes a first passage, one end of the first passage is in communication with the fluid inlet of the heat exchanger body, at least part of the thermostatic assembly is arranged in the first passage, the thermostatic assembly comprises a valve body provided with a valve chamber, the valve body is provided with an inlet, a first outlet, and a second outlet which are all in communication with the valve chamber; a return spring, a shape memory alloy spring, and a valve sleeve are provided in the valve chamber, the valve sleeve is slidable back and forth in an axial direction, the shape memory alloy spring is made of a memory alloy material, and the return spring and the shape memory alloy spring are respectively located on two sides of the valve sleeve.

A drive device rotating an axle of a vehicle includes: a motor having a rotor and a stator; a housing; a temperature sensor for detecting a temperature of the motor; and an oil passage supplying oil to the stator from above. The stator includes a stator core and a coil assembly having coils attached to the stator core. The coil assembly has a terminal portion located on one side of the motor axis in a predetermined direction orthogonal to both the axial direction and the vertical direction. The temperature sensor is in a portion of the coil assembly on one side in the predetermined direction with respect to the motor axis. The temperature sensor is on a lower side with respect to the terminal portion and an upper side with respect to an end on a lower side in the vertical direction with respect to the rotor.

An apparatus and method for controlling temperature of automatic transmission fluid, and a vehicle system are provided. The apparatus includes a determination device that determines whether a temperature difference between the temperature of the automatic transmission fluid and a target temperature thereof satisfies a heating control condition of the automatic transmission fluid at the start of charging. A then adjusts the temperature of the automatic transmission fluid by outputting an operation control signal for at least one driving unit of a thermal management system, when the temperature difference satisfies the heating control condition of the automatic transmission fluid.