US 12,434,764 B2
Electric multi-mode steer-by-wire system and mode switching method thereof
Junnian Wang, Changchun (CN); Ruihao Fan, Changchun (CN); Haolun Gu, Changchun (CN); Kefu Zhu, Changchun (CN); Dongxu Fu, Changchun (CN); and Shuo Zhuang, Changchun (CN)
Assigned to Jilin University, Changchun (CN)
Filed by Jilin University, Changchun (CN)
Filed on Aug. 8, 2022, as Appl. No. 17/882,853.
Claims priority of application No. 202110907977.1 (CN), filed on Aug. 9, 2021.
Prior Publication US 2023/0033401 A1, Feb. 2, 2023
Int. Cl. B62D 7/15 (2006.01); B62D 5/04 (2006.01)
CPC B62D 7/1509 (2013.01) [B62D 5/0463 (2013.01); B62D 5/0493 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An electric multi-mode steer-by-wire system, comprising:
a steering hand wheel unit, configured to be manipulated by a driver to input a steering action;
a steering execution unit, configured to perform a wheel steering action;
a mode selection and display unit, configured for manual steering mode selection and state display; and
an electronic control unit, configured to receive a state signal and send a control instruction;
wherein the steering hand wheel unit comprises a steering hand wheel, a torque and angle sensor (TAS), a road-feeling motor, a reducer for the road-feeling motor, an electromagnetic clutch, a torsion bar, a steering drive shaft, an upper transmission shaft, two pins, a first steering universal joint, a second steering universal joint, a lower transmission shaft and a third steering universal joint; and the reducer is a worm gear-worm reducer;
the steering execution unit comprises a pair of steering road wheels, a first steering electric motor mechanism, a second steering electric motor mechanism, a steering gear, a first lead screw position sensor, a second lead screw position sensor, a first electromagnetic valve, a second electromagnetic valve and an oil tank; an upper end of the steering gear is connected to the steering hand wheel unit; a first lateral end of the steering gear is connected to the first steering electric motor mechanism, and a second lateral end of the steering gear is connected to the second steering electric motor mechanism; the first steering electric motor mechanism is connected to the one of the pair of steering road wheels through a first steering tie rod; the second steering electric motor mechanism is connected to the other of the pair of steering road wheels through a second steering tie rod; and the first electromagnetic valve and the second electromagnetic valve are both connected to the oil tank to control communication between an oil pipe and the oil tank;
the mode selection and display unit comprises a first mode selection button, a second mode selection button, a third mode selection button and a central control panel; and
the electronic control unit is connected to the road-feeling motor, the TAS, the electromagnetic clutch, the first lead screw position sensor, the second lead screw position sensor, the first electromagnetic valve, the second electromagnetic valve, the first steering electric motor mechanism, the second steering electric motor mechanism, the first mode selection button, the second mode selection button and the third mode selection button through a signal wire, respectively; and the electronic control unit is connected to the central control panel through a controller area network (CAN) bus.