US 11,937,538 B2
Work vehicle and grass mowing machine
Kazuaki Matsuda, Sakai (JP); Katsuhiko Uemura, Sakai (JP); Yasuhiro Manji, Sakai (JP); and Ryo Ikeda, Sakai (JP)
Assigned to Kubota Corporation, Osaka (JP)
Filed by Kubota Corporation, Osaka (JP)
Filed on Apr. 9, 2019, as Appl. No. 16/378,697.
Claims priority of application No. 2018-118111 (JP), filed on Jun. 21, 2018; and application No. 2018-199330 (JP), filed on Oct. 23, 2018.
Prior Publication US 2019/0387670 A1, Dec. 26, 2019
Int. Cl. B60W 60/00 (2020.01); A01D 34/00 (2006.01); A01D 34/66 (2006.01); A01D 34/74 (2006.01); A01D 34/82 (2006.01); B60W 50/08 (2020.01); G05D 1/00 (2006.01); A01D 101/00 (2006.01)
CPC A01D 34/008 (2013.01) [A01D 34/66 (2013.01); A01D 34/74 (2013.01); A01D 34/824 (2013.01); B60W 50/082 (2013.01); B60W 60/0053 (2020.02); G05D 1/0061 (2013.01); A01D 2101/00 (2013.01)] 10 Claims
OG exemplary drawing
 
8. A grass mowing machine comprising:
a drive wheel unit driven by a traveling motor;
a vehicle speed operational tool capable of adjusting a vehicle speed of a machine body;
an operation detection section capable of detecting an operational position of the vehicle speed operational tool;
a traveling control section for controlling a rotational speed of the traveling motor based on the operational position;
a brake device capable of braking the drive wheel unit based on an operation of a brake operational tool;
a storage section capable of storing a drive state of the machine body; and
a traveling mode management section capable of switching over between an automatic traveling mode in which the traveling control section controls the rotational speed of the traveling motor based on the stored drive state and a manual traveling mode in which the traveling control section controls the rotational speed of the traveling motor based on the operational position by a manual operation of the vehicle speed operational tool;
wherein in the automatic traveling mode, the traveling mode management section switches over to the manual traveling mode if the brake operational tool is operated by an amount greater than a set operational amount which is set preliminarily;
wherein the vehicle speed operational tool is operable among/to a forward traveling speed changing region capable of changing a forward traveling vehicle speed, a reverse traveling changing region capable of changing a reverse traveling vehicle speed and a neutral position located between the forward traveling speed changing region and the reverse traveling speed changing region and capable of stopping the machine body;
wherein the storage section stores a desired position in the forward traveling speed changing region as a stored position; and
wherein in the automatic traveling mode, the traveling control section controls a rotational speed of the traveling motor based on the stored position if the vehicle speed operational tool is operated between the neutral position and the stored position; and the traveling control section controls the rotational speed of the traveling motor based on the operational position by the manual operation of the vehicle speed operational tool if the vehicle speed operational tool is operated to more acceleration side than the stored position.