Continuously variable powertrain device for work vehicle and work vehicle including the same
AssigneeKubota Corporation
InventorsTetsuo Yamaguchi, Ryoma Iwase, Tomonari Tsuchida
Life of this patent
Estimating the term…
Abstract
A continuously variable powertrain device for a work vehicle includes a continuously variable transmission to output a continuously shifted motive power while continuously varying a speed of a motive power received from an engine, a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power, a planetary clutch to switch a shift level of the planetary transmission a forward-reverse direction switch to receive the compound motive power and to output either a forward motive power or a reverse motive power, rotation detectors, and a powertrain controller.
Claims17
A continuously variable powertrain device, for a work vehicle, to transmit a motive power from an engine to a travel device, the continuously variable powertrain device comprising:
- a continuously variable transmission to output a continuously shifted motive power while continuously varying a speed of the motive power received from the engine;
- a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power;
- a planetary clutch mechanism to switch a shift level of the planetary transmission;
- a forward-reverse direction switch to receive the compound motive power and to output either a forward motive power or a reverse motive power;
- a rotation detector group including a plurality of rotation detectors to detect an engine rotation speed, a continuously variable rotation speed, a composite rotation speed and a travel rotation speed, the engine rotation speed being an output rotation speed of the engine, the continuously variable rotation speed being a rotation speed of the continuously shifted motive power, the composite rotation speed being a rotation speed of the compound motive power, the travel rotation speed being a rotation speed of either the forward motive power or the reverse motive power;
- and
- a powertrain controller configured or programmed to:
- generate a control signal to control actuation of the continuously variable transmission, the planetary transmission, and the forward-reverse direction switch based on a shift command by using the engine rotation speed, the continuously variable rotation speed, the composite rotation speed, and the travel rotation speed;
- and
- function as a determiner to determine whether or not the rotation detector group is in an abnormal state by using at least one determination rule selected from a plurality of abnormality determination rules based on an operation condition with the planetary clutch mechanism and the forward-reverse direction switch.
A continuously variable powertrain device, for a work vehicle, to transmit a motive power from an engine to a travel device, the continuously variable powertrain device comprising:
- a continuously variable transmission to output a continuously shifted motive power while continuously varying a speed of the motive power received from the engine;
- a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power;
- a planetary clutch mechanism to switch a shift level of the planetary transmission;
- a forward-reverse direction switch to receive the compound motive power and to output either a forward motive power or a reverse motive power;
- and
- a powertrain controller to generate a control signal to control actuation of the continuously variable transmission, the planetary transmission and the forward-reverse direction switch, the powertrain controller being configured or programmed to function as:
- an engine rotation speed obtainer to obtain an engine rotation speed which is an output rotation speed of the engine;
- a continuously variable rotation speed obtainer to obtain a continuously variable rotation speed which is an output rotation speed of the continuously variable transmission;
- a composite rotation speed obtainer to obtain a composite rotation speed which is a rotational speed of the compound motive power;
- and
- a travel rotation speed obtainer to obtain a travel rotation speed which is a rotation speed of either the forward motive power or the reverse motive power;
- wherein
- at least one of the engine rotation speed obtainer, the continuously variable rotation speed obtainer, the composite rotation speed obtainer or the travel rotation speed obtainer is configured or programmed to obtain a corresponding rotation speed based on rotation speed signals from a plurality of rotation detectors to detect a same type of rotation speed.
Dependencies are inferred from the claim text.