The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2022
Filed:
Sep. 29, 2017
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Koji Hyodo, Ibaraki, JP;
Isamu Aoki, Ibaraki, JP;
Tetsuji Tanaka, Chiba, JP;
Koji Shimazaki, Hyogo, JP;
Hironao Suzuki, Ibaraki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A wheel loader configured to reduce a sudden change in vehicle speed caused by an erroneous determination of a raising operation of a lift arm is provided. A wheel loaderincludes an engine, a variable displacement type HST pump, a variable displacement type HST motorcoupled to the HST pumpin a closed circuit, a hydraulic pump for working device, a forward/reverse selector switchfor switching a forward movement and a backward movement of a vehicle body, a depression amount sensorthat detects a depression amount of an accelerator pedal, a pressure sensorthat detects a discharge pressure Pa of the hydraulic pump for working device, and a controller. The controllerdetermines whether a specific condition to identify an upward movement of a lift armduring a forward travel of the vehicle body based on a forward/reverse switching signal, the depression amount of the accelerator pedal, and the discharge pressure Pa detected by the pressure sensor. When the specific condition is satisfied, the controllercontrols a displacement volume of the HST motoraccording to an increase of the discharge pressure Pa, so as to limit the vehicle speed.