Hydraulic systems and methods for a vehicle with a common pump supplying steering and braking functions
AssigneeOshkosh Corporation
InventorsJesse Steinke, Ryan Wolf, Chris Mills
Life of this patent
Estimating the term…
Abstract
A hydraulic system includes a pump having a pump outlet, a tank configured to supply fluid to the pump, a hydraulic motor coupled to an air compressor that is configured to supply compressed air to an air brake, a steering gear having an inlet workport and an outlet workport, and a compressor bypass valve. The compressor bypass valve is selectively movable between a first position where fluid flow is provided from the pump outlet to both the hydraulic motor and the inlet workport of the steering gear and a second position where the fluid flow from the pump outlet bypasses the hydraulic motor and is supplied to the inlet workport of the steering gear.
Claims20
A hydraulic system for a vehicle comprising:
- a pump including a pump outlet;
- a tank configured to supply fluid to the pump;
- a hydraulic motor coupled to an air compressor, the air compressor being configured to supply compressed air to an air brake;
- a steering gear including an inlet workport and an outlet workport;
- and
- a compressor bypass valve selectively movable between a first position where fluid flow is provided from the pump outlet to both the hydraulic motor and the inlet workport of the steering gear and a second position where the fluid flow from the pump outlet bypasses the hydraulic motor and is supplied to the inlet workport of the steering gear.
An electrified vehicle comprising:
- a chassis;
- two or more wheels coupled to the chassis;
- an energy storage device supported on the chassis;
- two or more drive motors, each being electrically coupled to the energy storage device and being configured to provide rotational energy to a respective one of the two or more wheels;
- and
- a hydraulic system including:
- a pump including a pump outlet;
- a tank configured to supply fluid to the pump;
- a hydraulic motor coupled to an air compressor, the air compressor being configured to supply compressed air to an air brake that is configured to selectively apply a braking force to the two or more wheels;
- a steering gear including an inlet workport and an outlet workport, wherein the steering gear is coupled to the two or more wheels to control a steering direction of the two or more wheels;
- and
- a compressor bypass valve selectively movable between a first position where fluid flow is provided from the pump outlet to both the hydraulic motor and the inlet workport of the steering gear and a second position where the fluid flow from the pump outlet bypasses the hydraulic motor and is supplied to the inlet workport of the steering gear.
A method of controlling steering and braking functions on an electrified vehicle, the method comprising:
- supplying pressurized hydraulic fluid at a supply pressure from a pump to a hydraulic motor through a compressor bypass valve;
- powering, via the hydraulic motor using a first portion of the supply pressure, an air compressor that supplies compressed air to an air brake;
- supplying a remaining portion of the supply pressure from the hydraulic motor to a steering gear.
Dependencies are inferred from the claim text.