摘要:
A vehicle (8) includes steerable front wheels (18), an interaxle differential (14) for transmitting torque from an engine (10) to the front wheels (18) and to rear wheels (22). The differential (14) includes a controllable clutch (24) operable to control a ratio of front wheel speed to rear wheel speed. A control unit (30) controls the clutch (24) as a function of sensed steering angles and stored information including steering angles and corresponding front to rear wheel speed ratio values. The control unit (30) is automatically calibrated. The control unit (30) periodically obtains steering angle values, periodically obtains front and rear wheel speed values, periodically generates new front to rear wheel speed ratio values, and replaces one of the stored front to rear wheel speed ratio values with one of the new ratio values if the steering angle values indicate that the vehicle (8) has been in a straight ahead travel mode for at least a certain time period.
摘要:
A braking/driving force fx is calculated at S102, and a lateral force Fy is calculated at S103. At S104, reference is made to a preset map to select a road surface µ estimation part to be used for determination (to select a first road surface µ estimation part or a second road surface µ estimation part or nonperformance of determination). At S105, a display flag Fla from the road surface µ selection part is read. Indication 1 is displayed (S107) in the case of a road having a high µ. Indication 2 is displayed (S109) in the case of a road having a medium µ. Indication 3 is displayed (S111) in the case of a road having a low µ. Indication 0 is displayed (S112) in other cases wherein the road surface µ is unknown.
摘要:
A vehicle apparatus is provided to enable a clutch (12) to be re-engaged without creating a shock when there is rollback of the wheels (3L or 3R) which are driven by an electric motor (4) via the clutch (12). The vehicle apparatus comprises a travel direction command determining section (steps S43, S44), an electric motor counterelectromotive force detecting section (step S22), and a wheel rotational direction determining section (steps S42, S45, S46). The travel direction command determining section (steps S43, S44) is configured to determine whether a forward travel command or a reverse travel command has been issued. The electric motor counterelectromotive force detecting section (step S22) is configured to detect a counterelectromotive force of an electric motor (4) that drives a wheel (3L or 3R) of a vehicle. The wheel rotational direction determining section (steps S42, S45, S46) is configured to determine whether the wheel (3L or 3R)is rotating in an opposite direction to a vehicle travel direction command determined by the travel direction command determining section (steps S43, S44), based on a determination that a polarity of the counterelectromotive force detected by the electric motor counterelectromotive force detecting section (steps S22) does not match the vehicle travel direction command determined by the travel direction command determining section (steps S43, S44).
摘要:
A four-wheel drive vehicle provides a torque distribution clutch mechanism which directly transmits the driving force generated from the engine to one of tow front wheels or two rear wheels, and which transmits it to the other wheels therethrough in order to control the engaging force in accordance with a traveling status of the four-wheel drive vehicle. The vehicle further comprises a tight corner judging means, a normal mode setting means, a low friction road judging means and a tight mode setting means. The tight corner judging means judges whether the vehicle travels at a large turning angle or not, and the normal mode setting means sets a normal mode to control the engaging force when it is judged by the tight corner judging means that the vehicle does not travel at the large turning angle. Further, the low friction road judging means judges whether the vehicle travels on a low friction road or not, and the tight mode setting means for setting a tight mode to control the engaging force in a condition that it is judged by the tight corner judging means that the vehicle travels at the large turning angle when it is judged by the low friction road judging means that the vehicle dose not travel on the low friction road.
摘要:
A controller (40), method of control, and motor vehicle (1) are provided. The controller (40) is for controlling a driveline (105,5) of a motor vehicle (1) to transition between first and second modes of operation, wherein a first group of one or more wheels and not a second group of one or more wheels is connected to a torque transmission (118) path from the prime mover means when the driveline (105,5) is in the first mode of operation and both the first and second groups of one or more wheels are connected to the torque transmission (118) path when the driveline (105,5) is in the second mode of operation, wherein the second group of one or more wheels is connected to the torque transmission (118) path by means of an auxiliary portion (10,110) comprising first and second releasable torque transmitting means and a prop shaft (123,23), the first releasable torque transmitting means being operable to connect a first end of the prop shaft (123,23) to the torque transmission (118) path, the second releasable torque transmitting means being operable to connect a second end of the prop shaft (123,23) to the second group of one or more wheels. The controller is configured to: control the auxiliary portion (10,110) to switch the driveline (105,5) between the first and second modes of operation such that in the first mode the prop shaft (123,23) is disconnected from both the torque transmission (118) path and said second group of one or more wheels; control the driveline (105,5) to transition from the first mode to the second mode when a second mode trigger condition is met, the second mode trigger condition including the requirement that the magnitude of the value of a vehicle (101,1) operating parameter of a first set of one or more vehicle (101,1) operating parameters is less than or greater than a first threshold (A1, T2) value; and control the driveline (105,5) to subsequently transition from the second mode to the first mode when a first mode trigger condition is met, the first mode trigger condition including the requirement that the magnitude of the value of said vehicle (101,1) operating parameter of the first set is greater than or less than a second threshold (A1, T2) value, the second threshold (A1, T2) value having a value different from the first threshold (A1, T2) value, wherein values of the first and/or second threshold (A1, T2) values are responsive to a value of a vehicle (101,1) operating temperature parameter.
摘要:
The invention relates to a drive device for an all-wheel-drive two-track motor vehicle, in the powertrain of which a drive assembly (1) outputs permanently to a first vehicle axle (VA) and to a second vehicle axle (HA) via a center clutch (13) during a driving operation. When the center clutch (13) is engaged, the second vehicle axle (HA) is connected to the powertrain, and when the clutch (13) is disengaged, the second vehicle axle (HA) is decoupled from the powertrain. In a driving situation in which the all-wheel drive is enabled and has axle frictional coefficients (µVA, µHA) of differing values, a greater wheel torque (MVA) can be applied to the vehicle axle (VA) with the larger axle frictional coefficient (µVA) than to the vehicle axle (HA) with the smaller axle frictional coefficient (µHA). A controller (27) is provided which limits the drive assembly (1) to a maximally allowable motor torque (Mmot,max) in order to limit the motor torque. According to the invention, the controller (27) has an analysis unit (29) with which the maximally allowable motor torque (Mmot,max) can be ascertained and adapted in order to prevent an overload of the vehicle axle (VA) with the larger axle frictional coefficient (µVA). The maximally allowable motor torque (Mmot,max) is produced by adding (45) a structurally specified overload threshold (MVA,Ü), which is stored in the analysis unit (29) and which, once reached, indicates the risk of component damage to the vehicle axle (VA) with the larger axle frictional coefficient (µVA), to at least one maximally allowable potential moment of inertia component (MT,HA) on the vehicle axle (HA) with the smaller axle frictional coefficient (µHA), said moment of inertia component (MT,HA) relieving the load on the vehicle axle (VA) with the larger axle frictional coefficient (µVA).
摘要:
A vehicle (100) control strategy provides for automatically controlled movement from rest with deliberate wheel slip to maximize thrust. Different wheel slip conditions are provided for different terrain types. Wheel slip may be progressively reduced as the vehicle (100) reaches a steady state speed. The strategy may also be implemented to maintain vehicle (100) progress on low friction surfaces. The vehicle (100) driver may be commanded to vary a control input, such as accelerator pedal (110P, 11) position.
摘要:
An electrically driven vehicle equipped with electric motors (1, 4) for driving or braking drive wheels (3, 6), and an electric motor controller (33) for controlling the electric motors includes: wheel speed detectors (9 to 12) for detecting the wheel speed of the drive wheels and that of idler wheels (7, 8); computing means (22 to 28, 35 to 38) for computing the slip ratio of the drive wheels based on the wheel speed of the drive wheels and that of the idler wheels; and a determiner (29) for determining that the drive wheels are slipping if the slip ratio exceeds a slip ratio determination value. If the wheel speed of the idler wheels is lower than set speeds Va 2 , Vb 2 , then the determiner (29) changes the slip ratio determination value to a value having as the same sign as, and a larger absolute value than, the values »a 2 , »b 2 used when the wheel speed of the idler wheels is higher than the set speeds Va 2 , Vb 2 . This structure shortens acceleration time during acceleration traveling and reduces braking distance during deceleration traveling while inhibiting vibrations of the electrically driven vehicle.
摘要:
An object is to provide a motorcycle that sets a target slip value based on an accelerator operation by a driver, and is able to prevent sharp drop of the output torque of the drive power source and to obtain comfortable riding during execution of traction control. The motorcycle includes: a target slip value calculating section for calculating a target slip value, based on an accelerator operation by a driver; and an actual slip value calculating section for calculating an actual slip value, based on the difference between the rotation speed of the front wheel and the rotation speed of the rear wheel. The motorcycle further has a drive power source control section for reducing the output torque of the drive power source, based on the difference between a criterion value different from the target slip value and the actual slip value when the actual slip value is lower than the target slip value.