摘要:
In a speed change control method for an automatic transmission for vehicles with a plurality of gearshift positions, the frictional resistance of a road surface is detected, gearshifting to at least a lowest-speed gearshift position is prohibited if the frictional resistance of the road surface is judged to be low. Preferably, gearshifting to at least the lowest-speed gearshift position is prohibited at starting the vehicle if the frictional resistance of the road surface is judged to be low. the frictional resistance of the road surface is determined to be low when the sum of detection frequency(%) of the detected frictional resistance values, each of which is a first predetermined value or less, is a second predetermined value or more.
摘要:
An improved control system and method for an automatic mechanical transmission system (10) having an operator selectable (44A) cruise control mode of operation is provided. In the cruise control mode of operation, if fueling to the engine is at approximately 100% of full throttle, the cruise control speed error (SE) exceeds a speed error reference (REF-SE) and a time derivative of output shaft speed (dOS/dt) is less than a first reference value (REF-1), which reference value has a negative value, then shift decisions will be based on enhanced performance shift profile (E-F-G, U-V-W) similar to "kick-down" shift profiles.
摘要:
A shift characteristic of an automatic transmission is altered in accordance with a load of an engine and a change rate of the load of the engine. The shift characteristic may have a power mode and an economy mode, and the shift characteristic is switched between the power mode and the economy mode when the load of the engine becomes a predetermined reference value. When the load of the engine becomes equal to or larger than the reference value, the economy mode is shifted to the power mode. The reference value is changed in accordance with a change rate of the load of the engine, and the reference value becomes smaller as the change ratio becomes larger. This construction allows the shift characteristic of the automatic transmission to be altered so as to be appropriate for the requirement by the operation for acceleration.
摘要:
A speed change control system configured to allow a driver to promptly sense a response to an accelerating operation. A reference index value Mi1 that the driver senses an acceleration response is calculated based on acceleration of a vehicle. If the reference index value Mi1 is smaller than a first reference index value Ar at which the driver is allowed to sense the acceleration response, a downshift point is lowered to a first drive force.
摘要:
A vehicle (10) has an automatic multi-speed transmission. For starting from rest a launch ratio is selected by a slope and/or obstacle device (13, 15) according to identification of an up-slope (12), a down slope, or an obstacle (17, 18).
摘要:
The present invention relates to a method for determination of one or more shift points for a gearbox in a motor vehicle which comprises an engine connected to, in order to drive, said gearbox, where a shift point represents an engine speed at which said gearbox is adapted to effecting a downshift or upshift, said one or more shift points are determined on the basis of an engine target speed ωT and a first engine speed difference &Dgr;ωTT, said target speed ωT is a desired speed for said engine, said first engine speed difference &Dgr;ωTT is a difference between a first engine speed at a first time t1 and said target speed ωT at a second time t2, and said first and second times t1 and t2 are separated by a time period T. The invention relates also to a system, a motor vehicle, a computer programme and a computer programme product thereof.
摘要:
The present invention relates to a method for determination of one or more shift points for a gearbox in a motor vehicle which comprises an engine connected to, in order to drive, said gearbox, where a shift point represents an engine speed at which said gearbox is adapted to effecting a downshift or upshift, said one or more shift points are determined on the basis of an engine target speed ωT and a first engine speed difference &Dgr;ωTT, said target speed ωT is a desired speed for said engine, said first engine speed difference &Dgr;ωTT is a difference between a first engine speed at a first time t1 and said target speed ωT at a second time t2, and said first and second times t1 and t2 are separated by a time period T. The invention relates also to a system, a motor vehicle, a computer programme and a computer programme product thereof.
摘要:
In control for a vehicle provided with a transmission in which a speed or shift range is changed by a shift operation performed by a driver, and a shift indicator that indicates a shift operation into an optimum speed or shift range selected based on a running state of the vehicle to the driver, it is determined whether an amount of fuel remaining in a fuel tank (64) is low, and if it is determined that the amount of fuel remaining is low, a speed or shift range set in advance such that priority is given to fuel efficiency performance over power performance is selected as the optimum speed or shift range based on the running state of the vehicle (10).
摘要:
An automatic speed-change control device comprises a speed change map for detecting an accel operation quantity provided by the operator stepping on the accel pedal and detecting the engine rpm depending on the detected accel operation quantity, the speed change being regulated by the accel operation quantity and engine rpm, wherein the speed changer is automatically shifted up or down for start control on the basis of the speed change map, the arrangement being such that the point at which the speed change map is switched by the operator stepping on the accel pedal is made learnable, preventing occurrence of unnecessary shift-down or delay in shift-up, ensuring efficient travel.
摘要:
A control system and method for a vehicle having an engine and a transmission with an autoshift function comprises a processor coupled to the engine and the transmission of the vehicle and adapted to control the power output of said engine and, in an autoshift mode of operation, the upshifting and downshifting of the transmission. The control system further comprises user interface means (10) coupled to said processor and including a first manual control means (14) being operable to be set to a first engine speed, and a second manual control means (16) being operable to be set to a second engine speed. The interface means (10) provides signals representing the setting of said first and second manual control means (14, 16) to said processor; and said control system has a plurality of modes of operation selectable by the relative settings of said first and second manual control means.