Electric travelling vehicle and grass mower
AssigneeKubota Corporation
InventorsKazuaki Matsuda, Hirokazu Ito, Yasuhiro Manji
Life of this patent
Estimating the term…
Abstract
An electric travelling vehicle including: a motor controller configured to control an electric motor based on displacement of a steering operation part to a forward travel position, a neutral position, and a rearward travel position, a brake controller configured to bring an electromagnetic power-off brake into a released state or a braking state; and a travel state detector configured to detect a travelling state that is accompanied with the released state, a stopped state that is accompanied with the braking state, and a transit stopped state that is accompanied with the braking state.
Claims3
A grass mower comprising:
- a mower unit that includes a rotation shaft to which a cutter blade is attached, a mower motor, and a mower power transmission mechanism that establishes a power transmission path through which power from the mower motor is transmitted to the cutter blade;
- a mower motor controller configured to control the mower motor;
- a mower drive state detector configured to detect a drive state of the mower motor;
- and
- a mower abnormality detector configured to detect an abnormality in the power transmission path based on a detection signal from the mower drive state detector;
- and
- a manual operation part configured to provide the mower motor controller with a drive instruction that is an instruction to drive the mower motor and a stop instruction that is an instruction to stop the mower motor from driving,
- wherein the mower motor controller forcibly stops the mower motor upon the mower motor abnormality detector detecting the abnormality, and
- wherein, when the mower motor is to be recovered from a forcibly stopped state, the stop instruction and the drive instruction that is subsequent to the stop instruction are required to be provided from the manual operation part.
A grass mower comprising:
- a mower unit that includes a rotation shaft to which a cutter blade is attached, a mower motor, and a mower power transmission mechanism that establishes a power transmission path through which power from the mower motor is transmitted to the cutter blade;
- a mower motor controller configured to control the mower motor;
- and
- a mower drive state detector configured to detect a drive state of the mower motor;
- and
- a mower abnormality detector configured to detect an abnormality in the power transmission path based on a detection signal from the mower drive state detector;
- wherein the mower motor is supplied with power via an inverter, the mower drive state detector includes a current detector that is built into the inverter and is configured to detect a current value of the mower motor, and the mower abnormality detector detects an abnormality in the mower unit upon the current value falling below a predetermined value while the mower unit is driving.
Dependencies are inferred from the claim text.