US 12,012,142 B2
Steer by wire with mechanical safety backup for a track vehicle
Tze Meng Jensen Chew, Singapore (SG); and Fu-Jun (Timmy) Low, Singapore (SG)
Assigned to ST ENGINEERING LAND SYSTEMS LTD., Singapore (SG)
Appl. No. 17/263,607
Filed by ST ENGINEERING LAND SYSTEMS LTD, Singapore (SG)
PCT Filed Aug. 3, 2018, PCT No. PCT/SG2018/050397
§ 371(c)(1), (2) Date Jan. 27, 2021,
PCT Pub. No. WO2020/027720, PCT Pub. Date Feb. 6, 2020.
Prior Publication US 2021/0291899 A1, Sep. 23, 2021
Int. Cl. B62D 11/00 (2006.01); B62D 11/02 (2006.01); G05D 1/00 (2006.01)
CPC B62D 11/003 (2013.01) [B62D 11/005 (2013.01); B62D 11/006 (2013.01); B62D 11/02 (2013.01); G05D 1/021 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A steering system for a track vehicle comprising:
a mechanical connection to a hydro-mechanical steering unit;
an electronic connection from a transmission control module to an electro-hydraulic control valve;
a steering pump displacement control unit that controls output to a right track and a left track of the track vehicle from simultaneous inputs from the hydro-mechanical steering unit and the electro-hydraulic control valve,
wherein the hydro-mechanical steering unit and electro-hydraulic control valve are hydraulically connected to the steering pump displacement control unit;
a steering pump mechanically connected to the steering pump displacement control unit; and
a steering motor hydraulically connected to the steering pump for varying output to the left and right tracks of the vehicle.