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. 21, 2025
Filed:
Nov. 20, 2023
Volvo Truck Corporation, Gothenburg, SE;
Henrik Hagerman, Gothenburg, SE;
VOLVO TRUCK CORPORATION, Gothenburg, SE;
Abstract
A control system, for controlling an oil level in a gearbox of a vehicle, includes a supply line, a return line, a first valve and a second valve. The first and second valves are respectively controlled by a first fork and a second fork of the gearbox. The return line is connected to the supply line through the first valve and the second valve, which are arranged in serial, the first and second valves being both in the open position when the first and second forks are together in a direct drive configuration that engages a direct drive gear selection of the gearbox, so that the return line is pressurized when both valves are open and the supply line is pressurized. The control system includes a flow control unit, which is configured to lower the oil level in an oil sump of the gearbox when the return line is pressurized.