Abstract: A tire sealant layer comprising a rubber portion with an upper surface and a lower surface, and a barrier layer upon the lower surface of the rubber portion is disclosed. The rubber portion comprises a mixture of 100 parts of at least one rubber, 90-500 parts of at least one tackifier, optionally one or more extenders, optionally at least one hydroscopic substance, and a cure package. Also disclosed is a process for producing a sealant layer-tire inner liner combination as well as a sealant layer-containing tire and related processes involving the sealant layer-containing tire.

Abstract: A method includes operating a transceiver of a tire pressure monitoring system in an active operation mode, where the transceiver includes a battery and a data storage device. The method includes determining whether the transceiver is coupled to an external power source, and determining whether the data storage device of the transceiver includes sensor identifier data stored thereon when the transceiver is not coupled to the external power source. The method further includes transitioning the transceiver from the active operation mode to a battery storage mode when the data storage device does not include sensor identifier data stored thereon and the transceiver is not coupled to the external power source.

Abstract: A robot tool has a chassis and a wheel servicing sub-system supported on the chassis, the wheel servicing sub-system having a sub-system interface part engageable with a wheel interface part, the wheel servicing sub-system interface part engagement with the wheel interface part permitting operation of the wheel servicing sub-system to service the wheel, and a control unit on the robot tool to control operation of the wheel servicing sub-system to effect said wheel servicing. The wheel servicing sub-system is one or more of a chassis sub-system, a tool support sub-system, a fastener detaching/attaching sub-system, a fastener storage sub-system, a jacking sub-system, a wheel gripper sub-system, a tire inspection sub-system, a tire pressure sub-system, and a wheel balancing sub-system.

Abstract: Devices are taught for filling a tire with air, gas or a liquid and repairing the tire. In one embodiment, the tire repair tool discloses an transmittal control section, with the transmittal control section comprising a proximal end, the proximal end having an opening a distal end, with the distal end having a centralized opening to align with a punctureable seal at a proximal end of a gas cartridge; a passageway positioned between the proximal end of the gas cartridge and the distal end; and a puncture tool which can puncture the punctureable seal of the gas cartridge. The puncture tool is positioned at the distal end of the transmittal control section along the air passage way. An insertion tube comprises an air inlet at a distal end of the insertion tube which is connected to the opening of the proximal end of the transmittal control section.

Abstract: A vehicle system comprises a hitch ball mounted on a vehicle and a controller. The controller is configured to identify a coupler position of a trailer and control movement of the vehicle aligning the hitch ball with the coupler position. The controller is further configured to identify a change in the coupler position and stop the motion of the vehicle in response to the change in position of the trailer.

Abstract: A vehicle system comprises a hitch ball mounted on a vehicle and a controller configured to identify a coupler position of a trailer. The controller is further configured to control motion of the vehicle aligning the hitch ball with the coupler position and monitor a height of the coupler relative to the hitch ball. In response to the coupler height being less than a height of the hitch ball, the controller is configured to stop the motion of the vehicle.

Abstract: A vehicle system is configured to control a trailer alignment routine. The system comprises a hitch ball mounted on a vehicle and a controller configured to identify a coupler position of a trailer. The controller is further configured to control motion of the vehicle to an aligned position, wherein the hitch ball is aligned with the coupler position. In response to the aligned position, the controller activates a service brake holding the vehicle and while maintaining the service brake activation, the controller activates a parking brake.

Abstract: It is provided a multiple track and multiple axle motor vehicle, having at least two front wheels, at least two rear wheels, and a steering apparatus which is configured for steering the front and rear wheels of the motor vehicle. The at least two front wheels can be pivoted in each case about a front wheel steering rotational axis by means of the steering apparatus, the front wheel steering rotational axes being oriented in each case in such a way that a negative caster is produced in relation to the respective front wheel, and the at least two rear wheels can be pivoted in each case about a rear wheel steering rotational axis by means of the steering apparatus, the rear wheel steering rotational axes being oriented in each case in such a way that a positive caster is produced in relation to the respective rear wheel.

Abstract: A method for producing motor vehicle controls from extruded profiles and a motor vehicle control. A length section of an extruded profile strand is provided and this is either processed by cutting technology and divided into several extrusion profiles or is first divided into several extruded profiles and they are then processed via shear cutting. By means of a mechanical processing of the extrusion profiles, the motor vehicle controls are formed. The length section has a double T-shaped cross-section with a brace and two belts aligned perpendicular to the brace, wherein the end-side of the belts are connected to flanges. During manufacturing, a motor vehicle control is produced with a steering element, which comprises a middle part and two side arms. In the middle part as well as in the side arms, bearing housings are configured.

Abstract: An omnidirectional movement system includes a frame with a central axis extending from a first end to a second end; a support extending from the first end to the second end; a first set of Mecanum wheels connected through a first axle and connected to the frame; a second set of Mecanum wheels connected through a second axle and connected to the frame; and a flexible suspension system connecting the frame to the support.

Abstract: A multi-plate spring suspension of composite material for a vehicle includes: a first bracket unit mounted to a rubber spring; a second bracket unit mounted to a trunnion base; and a plurality of composite springs manufactured by impregnating reinforcing fibers with resin, coupled to the first bracket unit and the second bracket unit at opposite ends thereof, respectively, and being vertically spaced apart from each other.

Abstract: A suspension device of the present invention includes a front wheel-side damper damping force of which is adjustable and which is placed between a vehicle body and a front wheel in a saddled vehicle, a rear wheel-side damper damping force of which is adjustable and which is placed between the vehicle body and a rear wheel, and a control device to control the damping force of the front wheel-side damper and the rear wheel-side damper. Responsiveness in a damping force adjustment of the front wheel-side damper is made higher than responsiveness in a damping force adjustment of the rear wheel-side damper.

Abstract: A work vehicle includes: a vehicle body; a plurality of traveling devices located on both right and left sides of the vehicle body; a plurality of bending link mechanisms that support the respective traveling devices on the vehicle body such that the traveling devices can be individually raised or lowered; and a plurality of drive mechanisms capable of individually changing the posture of the bending link mechanisms. The drive mechanisms change the posture of the bending link mechanisms while maintaining a state in which intermediate bending portions of the bending link mechanisms bend toward an intermediate side in a front-rear direction of the vehicle body.

Abstract: System and method for nullifying one or more of lateral and longitudinal acceleration forces experienced by an occupant of a vehicle in a seated or standing position while the vehicle is traveling along a travel plane, including: a chassis structure; and an occupant cell one of coupled to and defined by the chassis structure; wherein one or more of the chassis and the occupant cell are configured to pivot one or more of: laterally at a longitudinal pivot point with respect to the travel plane; and longitudinally at a transverse pivot point with respect to the travel plane. Optionally, the chassis structure is configured to pivot one or more of laterally and longitudinally with respect to one or more wheel mechanisms operable for traveling over the travel plane. Optionally, the occupant cell is configured to pivot one or more of laterally and longitudinally with respect to the chassis structure.

Abstract: Systems and methods for nullifying lateral and longitudinal acceleration forces experienced by an occupant of a vehicle in a seated or standing position while the vehicle is traveling along a travel surface, the system and methods including: a chassis structure; and an occupant cell structure defined by the chassis structure; wherein the chassis structure includes an upper link pivotably coupled to each of a first wheel assembly and a second wheel assembly and the occupant cell and a lower link pivotably coupled to each of the first wheel assembly and the second wheel assembly and the occupant cell; and wherein the upper link and the lower link define a parallelogram and are configured to translate with respect to one another maintaining parallel sides of the parallelogram, leaning the first wheel assembly, the second wheel assembly, and the occupant cell in unison with respect to the travel surface.

Abstract: A valve block for an active suspension damping system of a vehicle includes a valve housing delimiting an interior space for connecting to a shock absorber of a wheel suspension system, and a valve piston movably guided in the interior space. The valve piston divides the interior space into a connecting space and a control space. A connecting duct communicates with the connecting space for hydraulically connecting to a damper volume of the shock absorber. At least one connector duct communicates with is the connecting space for connection of a hydraulic line. A control duct communicates with the control space for applying a control pressure in the control space. The valve piston has a plug for closing the connecting duct in a closed position of the valve piston in the interior space and for opening the connecting duct in an open position of the valve piston in the interior space.

Abstract: A vehicle that includes a frame and a truck body coupled to the chassis. The truck body includes a body floor, first sidewall, second sidewall, front wall, and body rear, or tail surrounding an interior.

Abstract: A housing assembly for an HVAC system includes a first shell having a first boss having a first bore configured to receive a fastener therein. The housing assembly further includes a second shell having a second boss having a second bore. The housing assembly further includes a divider disposed between the first shell and the second shell, the divider having a divider bore configured to receive the first boss therein and a divider counterbore configured to receive the second boss therein. A diameter of the divider bore is less than a diameter of the divider counterbore. The divider bore and the divider counterbore are coaxial and configured to receive the fastener extending therethrough.

Abstract: A method for digitally controlling a heating arrangement may include receiving a temperature value with a control device, the temperature value reflecting a current outside temperature. The method may also include determining via the control device, based on the received temperature value, a limit output of the heating arrangement that is smaller than a maximum output of the heating arrangement. The method may further include dividing the determined limit output into a plurality of output stages via the control device, a number of the plurality of output stages corresponding to a digital resolution of the control device. The method may additionally include controlling the heating arrangement between a minimum output and the limit output to one of the plurality of output stages.

Abstract: Heat exchangers, such as radiators, condensers, or other cooling systems, are provided in the present disclosure. Heat exchanging systems may include an assembly for routing cooling conduits from the heat exchanger, along or through one or more A-pillars of the vehicle, and to a rooftop electronics assembly, which may be used for performing self-driving functions when the vehicle is configured as an autonomous vehicle or the like. The conduit routing assembly enhances manufacturing efficiency and cost effectiveness as compared to conventional assemblies. According to one embodiment of the present disclosure, an assembly for cooling a rooftop electronics assembly of a vehicle may include one or more conduits configured to transport a cooling fluid between an in-vehicle cooling system and the rooftop electronics assembly, wherein the one or more conduits are disposed partially along an A-pillar of the vehicle.

Abstract: Heating, ventilating and/or air-conditioning system for a motor vehicle, comprising a control device (12), at least one functional component (16) and at least one driver device (14) which is implemented separately from the control device (12) and from the at least one functional component (16), wherein the control device (12) is connected to the at least one driver device (14) in terms of information technology by means of a bus system (18), and wherein the driver device (14) has at least one driver (24) for the functional component (16), which can operate the functional component (16)

Abstract: An air extractor manufacturing method includes, among other things, molding at least one flap in a sealed position against a housing of an air extractor. The housing has a first material composition and the at least one flap has a second, different material composition. An air extractor assembly includes, among other things, a housing having a first material composition; and a flap having a different, second material composition. The flap is moveable relative to the housing between a sealed position and a pressure releasing position. The flap is molded in the sealed position and coupled to the housing when molded.

Abstract: A blower device includes a passage-forming section that forms a passage through which air flows inside. A partition section is provided within the passage-forming section. The partition section divides at least a part of the passage into a first passage and a second passage. The partition section has a hole. The hole passes through the partition section and provides a constant communication between the first passage and the second passage.

Abstract: A system for controlling a compressor may include an engine controller controlling a fuel injection amount corresponding to an engine load and an opening amount of a throttle by reflecting a required torque required for an air conditioner, an operation information detector for detecting operation information according to driving state of the vehicle, a compressor generating pressure through a piston operation of a cylinder utilizing the power of the engine during operation of the air conditioner, and a controller determining an engine negative pressure of an intake manifold stored in the brake booster at a value, and when the negative pressure of intake manifold is below a first threshold value when the brake is operated, the engine enters a negative pressure recovery mode for predicting an insignificant negative pressure drop condition that falls below a second threshold value which is the A/C cut control condition and reduces the A/C duty.

Abstract: A sliding golf cart windshield assembly includes a first elongated rail having a top end and a bottom end, and a second elongated rail spaced apart from the first elongated rail and having a top end and a bottom end. An upper windshield pane has a first longitudinal edge and an opposing second longitudinal edge, where the upper windshield pane is positioned between the first and second elongated rails. In addition, the assembly includes a first upper plate secured to the first longitudinal edge of the upper windshield pane and being slidable within the first elongated rail, a first lower hub coupled to the bottom end of the first elongated rail, and a first belt having a first end first end fixed to the top end of the first elongated rail and passes around the first lower hub to the second end that is fixed to the first upper plate.

Abstract: A vehicle flow influencing assembly includes, among other things, a downforce generator that extends laterally outward from an area of a vehicle, and that extends longitudinally from a leading edge portion to a trailing edge portion, the trailing edge portion aligned along a longitudinal axis of the vehicle with a side mirror of the vehicle, the downforce generator configured to influence flow to reduce buffeting.

Abstract: A sun visor assembly for a vehicle according to an exemplary aspect of the present disclosure includes, among other things, a visor having a transparent portion and a circuit configured to control at least one function of the visor. The visor is pivotable between a first position and a second position.

Abstract: An automotive solar protection plate, which is located hung on the side window of a car, through the use of fins or tongues that are an integral part of the plate and made from the same material, being plate and fins only one piece. The plate is adapted to be placed both on slightly curved windows or on straight windows of vehicles of different types (cars, trucks, trucks, off-road vehicles and others).

Abstract: Disclosed are light glare reducing apparatuses and related methods. A light glare reducing apparatus includes a first polarized body, a second polarized body, and a movable coupling that attaches the second polarized body to the first polarized body with the second polarized body at least partially overlapping the first polarized body. The first polarized body includes a first polarized material that is optically polarized in a first direction relative to the first polarized body. The second polarized body includes a second polarized material that is optically polarized in a second direction relative to the second polarized body. The movable coupling is configured to enable the second polarized body to move relative to the first polarized body to change an angle of the second direction relative to the first direction.

Abstract: A vehicle door structure that can displace inward a region directly above a lower end of a door built-in center pillar while preventing displacement of a door lower surface to absorb lateral collision energy immediately after lateral collision is provided. In the vehicle door structure including a door built-in center pillar extending from an upper end to a lower end at a front end in a rear door of a biparting door system, a reinforcement is provided on a door lower surface below the door built-in center pillar, a part of the lower end of the door built-in center pillar is mounted to the reinforcement, and a low rigidity portion having lower rigidity than an upper part the door built-in center pillar is provided directly above the lower end of the door built-in center pillar.

Abstract: A door beam includes an aluminum alloy extrusion body extended in a longitudinal direction and having a pair of webs and a pair of flanges to be positioned on an inner side and an outer side in a width direction of a vehicle body. The pair of webs connect the pair of flanges at joint portions of each of the pair of webs such that the pair of webs and the pair of flanges form a closed cross section in a direction perpendicular to the longitudinal direction, and the pair of webs do not have a welded portion.

Abstract: A retractable cover system includes laterally spaced apart guide rails that define an opening and each provide a track. A drive assembly includes a motor that drives a first gear. The first gear is coupled to a second gear. A cover has multiple slats configured to interlock with one another in a deployed configuration. The slats cooperate with the drive assembly and are slidable in the tracks between first and second positions within the opening in response to actuation of the drive assembly. The slats are stacked onto one another in a stowed configuration. One of the first and second gears is axially movable relative to the other of the first and second gears between coupled and decoupled positions. The motor is coupled to the slats with the first and second gears in the coupled position for automated operation. The motor is disconnected to the slats with the first and second gears in the decoupled position for manual operation.

Abstract: A roll tarp system for a truck or trailer having a container with a rear door. The roll tarp system includes a roll tarp mounted to an axle assembly and a cable coupler assembly coupled to the axle assembly. A flexible cable connects the cable coupler assembly to a rear arm which is pivotally attached to the rear door. The cable coupler assembly includes first and second hinge members and is rotatably coupled to the axle assembly to permit unrolling and rolling up of the tarp and to permit opening of the rear door in a sideways or upward direction. The cable coupler assembly may include one or more apertures to permit access to a manual drive shaft which passes through the cable coupler assembly.

Abstract: A vehicle having a vehicle body which is provided with a manually removable side panel at a longitudinal side of the vehicle, and a top having a top linkage which comprises a link arrangement on either side of the vertical longitudinal center plane of the vehicle, each link arrangement being pivotably mounted on a respective vehicle-attached main bearing. The removable side panel can be secured to at least one element of the top linkage by a manually unlockable locking device.

Abstract: A convertible top linkage which is displaceable between a closed and position, and having a link assembly on either side of a vertical longitudinal center plane of the top, each link assembly having a first and second link, the first link and the second link being pivotable relative to a common base and connected to each other via a coupling link which is hinged to the first link via a fixed joint and to the second link via a mobile joint. The second link may have a guide track for a guiding element of the coupling link, the guide track keeping the mobile joint in position relative to the second link when the two links are being pivoted in a defined angle range, the mobile joint being shifted relative to the second link when the two links are being pivoted outside of the defined angle range.

Abstract: Convertible top linkage arrangements on both of its two sides relative to the top's vertical longitudinal center plane pivotally mounted on a fixed main bearing, fastenable to a vehicle front wind apron by a front bow, connecting the arrangements to each other, both arrangements having a roof link whose front end reaches to the front wind apron in a closing position, the front bow fastenable to a deployment link on each side, the deployment link pivotally mounted on the respective roof link so that a fold section, which can be pivoted between a closing position, in which the deployment links extend along the roof links, and an opening position, in which the deployment links are pivoted with respect to the roof links, is formed by the front bow and the deployment link, the fold section taking its closing position with respect to the roof links when pivoting the top linkage.

Abstract: A glass plate module according to the present invention is a glass plate module to be attached at a position adjacent to a door of a vehicle that can be opened and closed, and the glass plate module includes a glass plate, a window assembly that is fixed to a peripheral edge of the glass plate, and a molding portion that includes a tubular molding portion main body provided with a through hole extending along the window assembly, and is fixed to the window assembly. The molding portion main body is configured to come into contact with a portion of the closed door.

Abstract: A vehicular slider window assembly includes at least one fixed window panel that defines an opening, an upper rail and a lower rail attached at the at least one fixed window panel, and a movable window panel that is movable along the upper rail and the lower rail. The movable window panel is movable between a closed position and an opened position. Each of the upper and lower rails comprises a recess for receiving adhesive therein. The recess is established along an attaching surface of the respective one of the upper and lower rails with a wall of the respective one of the upper and lower rails at least partially circumscribing the recess. The upper and lower rails are adhesively attached at the at least one fixed window panel via hotmelt adhesive dispensed at and along the respective recesses.

Abstract: A hand-held magnetic clamping system for clamping a car cover onto the exterior surface of a vehicle includes an encasing structure, and a plurality of magnets. A first clamping device can clamp the cover onto the exterior surface or can sandwich the cover between a second clamping device that adheres to the exterior surface. The plurality of magnets magnetically affixes the encasing structure to the body's surface, thereby preventing the car cover from sliding off of the exterior body's surface. The second clamping device can include nano-suction adhesion material and/or suction cups. As a result, the first contact side of the encasing structure is used to clamp a thickly padded car cover while the second contact side of the encasing structure is used to clamp a thinly padded car cover. Further, the second clamping device can be used to attach the cover to a non-ferromagnetic surface.

Abstract: A synchronized transmission (1) used in a motorcycle, wherein a crankshaft actuated by the engine and a driven shaft, connected to a rear wheel, are substantially parallel and kinematically connected therebetween, comprising a first axial actuation synchronizer (16) placed at the front of the crankshaft (2) and a second axial actuation synchronizer (17) arranged at the front of a driven shaft kinematically connected to a rear wheel, each synchronizer (16, 17) comprising a respective rotating cam actuator (26, 29) having a cam (29) apt to be rotated by a respective cam spindle (30) by determining a translation thereof which interferes with an actuation end of the respective synchronizer (16, 17).

Abstract: This vibration-damping device is configured such that an outer mounting member (11), an inner mounting member (12), or a partition member (16) has formed therein: a first restriction passage (23) for providing communication between a fourth liquid chamber (21) and a second liquid chamber (15) or a third liquid chamber (20); and a second restriction passage (24) for providing communication between the second liquid chamber (15) and the third liquid chamber (20). The flow resistance of the first restriction passage (23) and that of the second restriction passage (24) are different.

Abstract: The invention provides a vehicle engine system comprising: a fuel pump for selectively delivering fuel under high pressure; an accumulator having a first chamber for receiving an output from the fuel pump and a second chamber for receiving an oil feed, wherein as one chamber is filled up the other chamber is compressed; wherein on vehicle acceleration the fuel pump delivers fuel to a common rail fuel injection system, and on vehicle braking the fuel pump delivers fuel to the first chamber of the accumulator to thereby put the oil in the second chamber under pressure, and wherein on subsequent acceleration the oil chamber delivers an output under pressure.

Abstract: A transmission for a hybrid drive having transmission input and output shafts, a further transmission input shaft and an electric machine, which drives the further transmission input shaft. A main transmission has first and second partial transmissions with a plurality of gear planes and a pair of concentric fourth shafts, and shift elements. A range group can couple the main transmission and has a planetary gearset with three transmission elements. The first element can couple either of the transmission input shafts via the shift elements. The second element is connected to the transmission output shaft and can couple a gear plane of the partial transmissions via the shift elements. The third transmission element can be fixed to the housing or blocked against the first or second transmission element.

Abstract: A vehicle drive assembly with transverse dual-power-source, comprising two power sources and an automatic transmission. The automatic transmission has a first input shaft and a second input shaft, and the two power sources are respectively connected to the two input shafts; a first intermediate shaft is provided parallel to the first input shaft, a second intermediate shaft is provided coaxial with the first input shaft, a third intermediate shaft is provided coaxial with the first intermediate shaft, and a first gear and a second gear on the first intermediate shaft are in engaged transmission; a third gear shaft and a fourth gear on the second intermediate shaft are in engaged transmission; and a fifth gear and a sixth gear on the third intermediate shaft are in engaged transmission, and the sixth gear is simultaneously in engaged transmission with a seventh gear on a differential.

Abstract: A hybrid module for a powertrain of a motor vehicle includes a rotational axis defining an axial direction, a housing, first and second support bearings, an intermediate shaft, a separating clutch, and a sensor device. The second support bearing is arranged at a distance from the first support bearing in the axial direction to form a receiving space therebetween. The intermediate shaft is mounted by the first support bearing and the second support bearing to be rotatable relative to the housing about the rotational axis. The separating clutch has a rotary component arranged to be coupled to an electric machine, and connected for conjoint rotation with the intermediate shaft. The sensor device includes at least one part arranged in the receiving space.

Abstract: Provided is a drive control device (20) for controlling a motor (6) of a vehicle including the motor (6) for driving the vehicle, a speed reducer (7) for reducing the speed of rotation of the motor (6) to transmit the reduced rotation to a wheel, and a mechanism for supplying lubricating oil to the motor (6) and the speed reducer (7). The device (20) includes an oil temperature sensor (Sa) for obtaining the temperature of the lubricating oil, and a rotation speed detection module (28) for detecting the rotation speed of the motor (6). The device (20) further includes a torque limitation module (26) for limiting a torque to be generated in the motor (6), based on the obtained oil temperature and the detected rotation speed of the motor (6), when the oil temperature obtained by the sensor (Sa) is equal to or lower than a predetermined temperature.

Abstract: A vehicle includes: a radiator that cools cooling water; a grille shutter that is provided on a vehicle front side of the radiator and opens or closes a grille provided in a vehicle; a first flow path in which the cooling water passes through the radiator; a second flow path in which the cooling water does not pass through the radiator; a thermostat that switches a path between the first flow path and the second flow path; and a failure determiner that performs failure determination of the thermostat based on an actual temperature of the cooling water and an estimated temperature of the cooling water, the estimated temperature being calculated based on a temperature change of the cooling water caused by an open or close state of the grille shutter.

Abstract: A fuel tank assembly includes a shell defining an opening therein, an access panel connectable to the shell and movable between a closed position where the opening is closed and an open position where the opening is open, and a fuel tank disposed in the shell and slidably engaged with the shell. The fuel tank and the opening are dimensioned such that the fuel tank is slidable out of the shell via the opening when the access panel is in the open position. A generator assembly and a method of servicing a fuel tank of a generator are also described.

Abstract: A portal gear and a method to implement a portal gear for a model vehicle are provided. The portal gear may include a drive shaft attached to an input gear and an axle attached to an output gear. The portal gear may further include a housing to vertically contain the input gear and the output gear. Wherein the drive shaft transfers a rotational torque from an upper location to a lower location via a gear reduction resulting from the input gear rotating the output gear.

Abstract: A control device of a four-wheel drive vehicle that includes a central axle disposed between paired left and right control couplings and coupled to the paired control couplings and that is switched between a two-wheel drive state and a four-wheel drive state selects between provision and stop of a slip prevention control in which when at least one of the main drive wheel slips during running of the vehicle, a brake is automatically operated to the at least one slipping main drive wheel, and when the stop of the slip prevention control is selected and it is detected that the at least one main drive wheel has slipped in the four-wheel drive state, a rotation speed of the central axle is made lower than that at the time of detection of the slip of the at least one main drive wheel.