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:
Oct. 14, 2025
Filed:
Mar. 23, 2022
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A dump truck reduces drive wheel braking torques to avoid locking drive wheels during slipping and generates braking torques for driven wheels to ensure an overall braking torque using a controller that outputs a regenerative torque command value, corresponding to a brake pedal operation amount, to an inverter that regeneratively controls electric motors. The controller reduces the regenerative torque command value and outputs a drive command value, corresponding to a regenerative torque command value reduction amount, to a solenoid proportional valve, when the controller determines that slip ratios of rear wheels equal or exceed a predetermined value. A hydraulic pressure generated by a hydraulic valve based on the brake pedal operation amount actuates rear wheel brakes. A hydraulic pressure selected by a higher-pressure selecting valve that selects the higher of the hydraulic pressure from the hydraulic valve and the hydraulic pressure from the solenoid proportional valve actuates front wheel brakes.