V-belt continuously variable transmission for a vehicle engine
AssigneePivario AB
InventorsJohn Jonsson, Rolf Jonsson
Life of this patent
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Abstract
A control device for controlling a V-belt CVT (Continuously Variable Transmission) which is connectible to a vehicle engine and comprises a primary variator and a secondary variator. The control device has a plurality of sensors which generate electronic measured values, comprising an engine speed sensor which generates a first measured value, and a power sensor which generates a second measured value which is related to the torque of an output drive shaft connected to the secondary variator. The control device further comprises an electronic control unit which is adapted to control the V-belt CVT based on said measured values. A V-belt CVT having a control device as stated above, and a method for controlling such a V-belt CVT are also provided.
Claims18
A control device for controlling a V-belt CVT which is connectible to a vehicle engine and comprises a primary variator and a secondary variator, the control device having at least one sensor which generates an electronic measured value, said at least one sensor being selected from a group of sensors comprising a primary speed sensor, sensing the engine speed or a speed proportional thereto, a secondary speed sensor, sensing the speed of the secondary variator or a speed proportional thereto, a power sensor generating a measured value related to the torque of an output drive shaft connected to the secondary variator, and a throttle sensor
- and an electronic control unit for controlling the V-belt CVT based on said measured values, wherein the control device further comprises a clamping power actuator which is connected to the control unit and connectable to the primary variator, wherein the clamping power actuator is arranged to set the V-belt clamping power of the primary variator, wherein the control unit's control of the V-belt CVT comprises control of the clamping power actuator, and wherein the control unit is arranged to command the clamping power actuator to switch on the primary variator at a settable first engine speed and to set the actuator to maximum clamping power at a settable second engine speed.
A V-belt CVT which is connectable to a vehicle engine, said V-belt CVT comprising a primary variator and a secondary variator, and a control device for controlling the V-belt CVT, the control device having at least one sensor which generates an electronic measured value, said at least one sensor being selected from a group of sensors comprising a primary speed sensor, sensing the engine speed or a speed proportional thereto, a secondary speed sensor, sensing the speed of the secondary variator or a speed proportional thereto, a power sensor generating a measured value related to the torque of an output drive shaft connected to the secondary variator, and a throttle sensor, and an electronic control unit for controlling the V-belt CVT based on said measured values, wherein the control device further comprises a clamping power actuator which is connected to the control unit and connectable to the primary variator, wherein the clamping power actuator is arranged to set the V-belt clamping power of the primary variator, wherein the control unit's control of the V-belt CVT comprises control of the clamping power actuator, and wherein the control unit is arranged to command the clamping power actuator to switch on the primary variator at a settable first engine speed and to set the actuator to maximum clamping power at a settable second engine speed.
A method for controlling a V-belt CVT which is connected to a vehicle engine and comprises a primary variator, a clamping power actuator which is connected to a control unit and to the primary variator for setting the V-belt clamping power of the primary variator, and a secondary variator, comprising:
- the step of detecting and generating at least one electronic measured value related to at least one of the speed of the vehicle engine, the speed of the secondary variator, the torque of an output drive shaft connected to the secondary variator, and a throttle;
- and
- controlling the V-belt CVT based on said at least one measured value, comprising commanding the clamping power actuator to switch on the primary variator at a settable first engine speed and to set the actuator to maximum clamping power at a settable second engine speed.
A control device for controlling a V-belt CVT, which is connectible to a vehicle engine and comprises a primary variator and a secondary variator, the control device having at least one sensor generating an electronic measured value, said at least one sensor being selected from a group of sensors comprising a primary speed sensor, sensing the engine speed or a speed proportional thereto, a secondary speed sensor, sensing the speed of the secondary variator or a speed proportional thereto, a power sensor generating a measured value related to the torque of an output drive shaft connected to the secondary variator, and a throttle sensor, wherein the control device further comprises an electronic control unit for controlling the V-belt CVT based on said electronic measured value, and a clamping power actuator which is connected to the control unit and connectible to the primary variator, wherein the electronic control unit sets the V-belt clamping power of the primary variator by means of the clamping power actuator, wherein said clamping power actuator comprises a first operating arm, which is connectable to a movable pulley half of said primary variator, a shifting motor, which is connected to said first operating arm, and a motor drive unit, which is connected to said shifting motor and to said electronic control unit.
A V-belt CVT which is connectible to a vehicle engine, said V-belt CVT comprising a primary variator and a secondary variator, and a control device for controlling said V-belt CVT, the primary variator comprising a pulley with a fixed pulley half which is fixedly connectible to the crankshaft of the vehicle engine, and a movable pulley half which is displaceably connectible to the crankshaft, and the control device having at least one sensor generating an electronic measured value, said at least one sensor being selected from a group of sensors comprising a primary speed sensor, sensing the engine speed or a speed proportional thereto, a secondary speed sensor, sensing the speed of the secondary variator or a speed proportional thereto, a power sensor generating a measured value related to the torque of an output drive shaft connected to the secondary variator, and a throttle sensor, wherein the control device further comprises an electronic control unit for controlling the V-belt CVT based on said electronic measured value, and a clamping power actuator which is connected to the control unit and to the primary variator, wherein the electronic control unit sets the V-belt clamping power of the primary variator by means of the clamping power actuator, wherein said clamping power actuator comprises a first operating arm, which is connected to the movable pulley half of said primary variator, a shifting motor, which is connected to said first operating arm, and a motor drive unit, which is connected to said shifting motor and to said electronic control unit.
Dependencies are inferred from the claim text.