Hydraulic systems and methods for a vehicle with a common pump supplying steering and braking functions

An electrified vehicle comprising:

• a chassis;
• an energy storage device supported by the chassis;
• an air brake;
• and
• a hydraulic system including:
• a pump including a pump outlet;
• a hydraulic motor coupled to an air compressor, the air compressor being configured to supply compressed air to the air brake;
• a steering valve in fluid communication with 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 the hydraulic motor and the inlet workport in series and a second position where the fluid flow from the pump outlet bypasses the hydraulic motor and is supplied to the inlet workport.

A method of controlling steering and braking functions on an electrified vehicle, the method comprising:

• detecting, via a pressure sensor, a pressure within a reservoir that supplies pressurized air to an air brake;
• controlling a position of a compressor bypass valve based on the pressure within the reservoir;
• detecting that the pressure within the reservoir is below a pressure threshold;
• in response to detecting that the pressure within the reservoir is below the pressure threshold, instructing the compressor bypass valve to actuate to or stay in a first position where a pump supplies pressurized hydraulic fluid at a supply pressure to a hydraulic motor;
• powering, via the hydraulic motor using a first portion of the supply pressure, an air compressor that supplies compressed air to the reservoir;
• and
• supplying a remaining portion of the supply pressure from the hydraulic motor to a steering gear.