摘要:
A continuously variable transmission (CVT) for a vehicle includes an input member, an output member and a variator assembly including a first pulley rotatably coupled to the input member and a second pulley rotatably coupled to the output. The first and second pulleys are rotatably coupled by a flexible continuous rotatable device. A control system is provided including an instruction set executable to determine an initial variator speed ratio of the variator assembly and detect an event causing a change in an operational state of the vehicle. The control system determines a compensation strategy to adjust the variator speed ratio in response to the change in the operational state of the vehicle and generates an adjusted variator speed ratio based upon the compensation strategy. The control system transmits the adjusted variator speed ratio to the variator assembly.
摘要:
A system and method for controlling a vehicle having a continuously variable transmission (CVT) comprises a control system having at least one controller, an accelerometer and one or more sensors in communication with the at least one controller to monitor and detect a change in an operational state of the vehicle. The control system determines a vehicle acceleration rate with the accelerometer in response to the change in the operational state of the vehicle. An adjusted vehicle speed is computed based, at least in part, on the vehicle acceleration rate. A variator speed ratio is generated based upon the adjusted vehicle speed and transmitted to the variator assembly of the CVT.
摘要:
Embodiments of the present invention provide a system comprising: a first controller configured in each of a predetermined plurality of states to generate a torque request signal in order to cause a vehicle to operate in accordance with a target speed value, the system being configured, when the first controller is one of said plurality of states to generate a gear shift limit signal to cause a change in an engine speed at which a transmission controller is permitted to cause a gear downshift, the gear shift limit signal being generated in dependence on at least one traction indicator signal indicative of an amount of estimated traction between the vehicle and a driving surface.
摘要:
A vehicle controller includes a first abrupt deceleration determining unit (a rotation change rate determining unit, an ABS determining unit) configured to determine an abrupt deceleration state of a vehicle, and a second abrupt deceleration determining unit (a brake determining unit) having a required time for determining an abrupt deceleration shorter in comparison with that of the first abrupt deceleration determining unit, wherein any one of the first abrupt deceleration determining unit and the second abrupt deceleration determining unit is used for determining the abrupt deceleration of the vehicle 1 according to a vehicle speed of the vehicle or a road surface friction coefficient, and the second abrupt deceleration determining unit is used for determining the abrupt deceleration in a region where the vehicle speed or the road surface friction coefficient is lower than the first abrupt deceleration determining unit.
摘要:
Problems of work efficiency reduction by tire slip; durability reduction by tire damage; and large tire-changing costs for users are solved by preventing repeated tire slip occurrence in situations where tire slip likely occurs such as during excavation. A working vehicle of this invention has a work equipment, and an engine power is transmitted as driving force to the tires via a driving force transmission path. Driving force variation means for freely varying the driving force transmitted to the tires is provided in the transmission path of the working vehicle. Tire slip detection means detects tire slip occurrence. When the tire slip detection means detects tire slip, driving force measurement means measures the driving force at the time of tire slip detection. Driving force control means controls the driving force variation means such that the driving force becomes smaller than that at the time of tire slip detection.
摘要:
A method for preventing spinning of at least one drive wheel in a motor vehicle that has a dual clutch transmission, including the process steps of: a vehicle placed in a first gear unit of the dual clutch transmission; placement of a higher gear for the vehicle in a second gear unit of the dual clutch transmission; detecting whether the at least one drive wheel is spinning; disengaging the clutch that is assigned to the first gear unit, depending on whether spinning was detected; and engaging the clutch that is assigned to the second gear unit, depending on whether spinning was detected.
摘要:
A method (42) for preventing incorrect gear shifts in automatic transmissions (14) of motor vehicles comprising the following steps: determining a current output torque (Mis) of a source gear (GSOURCE); generating a history of output torques by storing the current output torque in the source gear (GSOURCE) for a time interval having a predetermined duration; determining an absolute value of a minimal output torque (Mmin) and an absolute value of a maximum output torque (Mmax) from the history (60) of output torques, comparing the two values and determining the greater absolute value; determining (S3) an absolute value of a target torque (MTARGET) of a target gear (GTARGET), if an instruction for a gear change exists; comparing (S4) the absolute value of the target torque (MTARGET) with the greater absolute value; and shifting (S5) the transmission (14) from the source gear (GSOURCE) to the target gear (GTARGET), if the absolute value of the target torque (MTARGET) is less than or equal to the greater absolute value (FIG. 2).
摘要:
When it is determined that the torque output from a power source is being automatically controlled, an ECU prohibits torque-boosting control of the power source during the torque phase when up-shifting, and performs up-shifting without performing torque-boosting control. In performing torque-boosting control, the driver demanded torque in response to the accelerator operation amount is used as the reference in setting amount of torque demanded from the power source.
摘要:
[Subject]To avoid wheel slip with high response and keep down worsening of exhaust irrespective of the engine performance. [Means of Solving the Problems]To be equipped with gear type transmission comprising the first torque transfer path between the input and output shafts formed by mesh type clutches 19, 20 and 21 and second torque transfer path between the input and output shafts formed by transfer torque variable systems 203 and 204, and actuators 27 and 205 for selecting the torque transfer path, wherein, when wheel slips while the automobile is driving using the first torque transfer path, the actuators 27 and 205 are so controlled that at least part of the torque being transferred via the first torque transfer path is transferred via the second torque transfer path.
摘要:
A shift control system that controls gear shifts in a vehicle includes a transmission and a controller. The controller detects driving conditions of the vehicle, estimates a traction load of the vehicle and determines a current traction load of the vehicle. The controller shifts the transmission based on the current traction load and the estimated traction load if the driving conditions are met. The current traction load is based on a lateral acceleration signal and a longitudinal acceleration signal. The estimated traction load is based on a curb weight of the vehicle, a weight transfer gain and an acceleration signal.