Abstract:
A method for effecting efficient engagement of a clutch to interconnect an engine and an implement which monitors operational parameters of the engine and implement and determines from those operational parameters at least two ramp rates for the application of hydraulic pressure to the clutch. The hydraulic pressure is applied at a first ramp rate to the clutch for a first period and applied at a second ramp rate to the clutch for a second period. A determination is made from the relationship between the input and output speeds of the clutch whether the clutch is fully engaged. If it is not fully engaged, clutch pressure is released and the ramp rates are reevaluated and reset. They are then sequentially applied for the first and second periods. The process repeats until full engagement is achieved or a determination is made that full engagement cannot be achieved.
Abstract:
A launch control method of a vehicle includes: a clutch hold step of maintaining a clutch torque until an engine torque becomes smaller than the clutch torque, when a driver releases an accelerator pedal during launch control; a time constant determination step in which a time constant for a rate of releasing the clutch torque is determined depending on a difference between the clutch torque and a target creep torque when the engine torque becomes smaller than the clutch torque; a filter processing step of processing the time constant and the target creep torque using a low-pass filter that has the time constant and the target creep torque as an input and has a nominal clutch torque as an output; and a clutch control step of controlling a clutch using the nominal clutch torque.
Abstract:
A hybrid vehicle control device is provided that is capable of achieving stable input torque control and torque capacity control of the clutch. When transitioning between a slip drive mode, in which the vehicle travels by controlling the rotation speed of the drive source and controlling the slip state of a starting clutch, and an engagement drive mode, in which the vehicle travels by controlling the torque of the drive source and completely engaging the starting clutch, the torque of the inertia component of the drive source side is deducted from the target drive torque set on the basis of the acceleration opening degree set as the starting clutch transfer torque capacity in the slip state.
Abstract:
The method comprises the steps of: storing a curve or characteristic of torque transmitted by the friction clutch as a function of the position of the clutch, calculating a desired value of the torque to be transmitted by means of the clutch, and modifying the position of the clutch so as to bring it to the position to which the desired transmitted torque value corresponds according to the stored curve or characteristic, upon the occurrence of predetermined operative conditions, estimating the value of the torque transmitted by the clutch, by means of an algorithm, as a function of the detected instantaneous values of the torque delivered and of the angular velocity of the shaft of the engine, and detecting the corresponding instantaneous position or estimate position of the clutch, and then modifying the previously stored curve or characteristic in accordance with predetermined procedures in dependence on the difference between the estimated value of the torque transmitted and that value of the torque transmitted which corresponds to the estimate position according to the previously stored curve or characteristic.
Abstract:
A depression force of an accelerator pedal 2 is increased than a base depression force by a predetermined amount when an accelerator opening degree becomes a predetermined accelerator opening degree threshold value at which an engine speed necessary at a start of a vehicle can be obtained by a depression of the accelerator pedal 2 in a state where a clutch 102 is disengaged at the start of the vehicle. With this, at the start of the vehicle, a driver becomes easy to hold the accelerator pedal 2 in a constant accelerator opening degree at which the engine speed necessary at the start can be obtained. It is possible to smoothly engage the clutch 102, and then to attain the smooth start of the vehicle.
Abstract:
If a user presses a clutch pedal to perform gear-shifting operation while a vehicle is traveling, a clutch disc, which has been engaged with a flywheel rotating with an engine, is brought to partial clutch engagement and slides on an end surface of the flywheel to generate friction. Thus, a first phenomenon in which a decreasing rate of the engine rotation speed rapidly increases occurs. Then, a second phenomenon in which the clutch disc is completely disengaged from the flywheel to eliminate the friction and the decreasing rate of the engine rotation speed returns to an original state occurs. If the first and second phenomena are detected successively when neither an engine side nor a power transmission system side transmits power for varying an engine rotation speed, it is determined that the clutch disc is disengaged.
Abstract:
In a method for controlling an automated clutch and/or an automated transmission in a motor vehicle with an electronic clutch management system, a target value for the clutch torque is determined as an output quantity of a start-up function dependent on suitable input quantities.
Abstract:
A method of updating the transmissibility function of a clutch during the final stage of a gear change, in which the clutch is closed to cause the angular speed of the drive shaft to equal the angular speed of the primary shaft of the gear change, the engine is set to supply a constant torque, the clutch is disposed in a predetermined position in order to transmit a constant torque greater than the torque supplied by the engine and the actual value of the torque transmitted by the clutch is calculated by subtracting the product of the moment of inertia of the engine and the angular acceleration of the drive shaft from the torque generated by the engine, the actual value of the torque transmitted by the clutch then being used to update the transmissibility function of the clutch.
Abstract:
A method of updating the transmissibility function of a clutch during the final stage of a gear change, in which the clutch is closed to cause the angular speed of the drive shaft to equal the angular speed of the primary shaft of the gear change, the engine is set to supply a constant torque, the clutch is disposed in a predetermined position in order to transmit a constant torque greater than the torque supplied by the engine and the actual value of the torque transmitted by the clutch is calculated by subtracting the product of the moment of inertia of the engine and the angular acceleration of the drive shaft from the torque generated by the engine, the actual value of the torque transmitted by the clutch then being used to update the transmissibility function of the clutch.
Abstract:
A power train in a motor vehicle has an automated clutch which is operated by a control unit by way of an actuator. The control unit receives signals from various parts of the engine, from the brake or brakes and from the transmission; such signals are processed and transmitted to the clutch by way of the actuator so that, when the vehicle is to carry out a crawling movement, the torque being transmitted by the then partly engaged clutch is properly related to the engine torque to ensure a predictable crawling movement of the vehicle regardless of eventual shifts of the operating point of the clutch and/or fluctuations of other parameters of the engine, transmission and/or clutch. The crawling movement can begin when the brake(s) is or are idle, the gas pedal is not depressed, and the engine is running; and crawling movement begins in response to shifting of the transmission into gear.