Power-assisted steering system and mobile inspection device

Patent metadata

Field	Value
Publication number	US-10093353-B2
Application number	US-201615280980-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Dec 29, 2015
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

The present disclosure relates to power-assisted steering systems and mobile inspection devices. Implementations may include and/or involve a directional control valve, a second hydraulic pump and a first driving motor. When determining an engine on a chassis has not been started, a central control unit may control start of the first driving motor according to a received travelling instruction such that the first driving motor drives the second hydraulic pump and then the power-assisted steering motor can be driven through a second oil path of the second hydraulic pump. Accordingly, the power-assisted steering system can be driven to operate when the mobile inspection device is in operation and the engine on chassis is not started, thus it is possible to drive the power-assisted steering system without the chassis engine operating.

First claim

What is claimed is:

1. A power-assisted steering system, comprising:
a central control unit,
a power-assisted steering motor, and
a first hydraulic pump connected to an engine on chassis,
wherein the power-assisted steering system further comprises a directional control valve, a second hydraulic pump and a first driving motor,
wherein the first driving motor is connected to the second hydraulic pump;
wherein the directional control valve is connected to each of the first hydraulic pump, the second hydraulic pump and the power-assisted steering motor so as to switch between a first oil path of the first hydraulic pump and a second oil path of the second hydraulic pump for driving the power-assisted steering motor;
wherein the central control unit is configured to:
when receiving a travelling instruction, determine whether the engine on chassis has been started; and
if the engine on chassis has not been started, control to start the first driving motor such that the first driving motor drives the second hydraulic pump and thus the power-assisted steering motor can be driven through the second oil path of the second hydraulic pump.

2. The power-assisted steering system according to claim 1 , further comprising a remote control device and a steering device connected to a steering wheel;
the central control unit is further configured to: receive the travelling instruction transmitted from the remote control device; and when determining the engine on chassis has not been started, control steering of the steering device according to the travelling instruction.

3. The power-assisted steering system according to claim 2 , wherein the second hydraulic pump is a hydraulic duplex pump, wherein one hydraulic pump of the hydraulic duplex pump is connected to the directional control valve via the second oil path, and the other hydraulic pump of the hydraulic duplex pump is connected to the steering device via a third oil path;
when the first driving motor is started, the hydraulic duplex pump can drive the power-assisted steering motor via the second oil path and supply oil to the steering device via the third oil path.

4. The power-assisted steering system according to claim 3 , wherein the steering device comprises a hydraulic directional control valve and a hydraulic motor, wherein the hydraulic motor is connected to each of the hydraulic directional control valve and the steering wheel;
the central control unit is further configured to: control the hydraulic directional control valve according to the travelling instruction so as to select an oil path through which oil will be supplied to the hydraulic motor, such that the hydraulic motor controls steering of the steering wheel according to the selected oil path.

5. The power-assisted steering system according to claim 3 , wherein the remote control device comprises a remote controller and a remote receiver, wherein the remote receiver is adapted to receive the travelling instruction transmitted from the remote controller and transmit the travelling instruction to the central control unit.

6. The power-assisted steering system according to claim 5 , wherein the steering device comprises a hydraulic directional control valve and a hydraulic motor, wherein the hydraulic motor is connected to each of the hydraulic directional control valve and the steering wheel;
the central control unit is further configured to: control the hydraulic directional control valve according to the travelling instruction so as to select an oil path through which oil will be supplied to the hydraulic motor, such that the hydraulic motor controls steering of the steering wheel according to the selected oil path.

7. The power-assisted steering system according to claim 6 , further comprising a second driving motor;
the central control unit is further configured to: after controlling to start the first driving motor, control to start the second driving motor so as to power a vehicle.

8. The power-assisted steering system according to claim 7 , wherein the central control unit is configured to: after controlling to start the first driving motor for a predetermined period of time, control to start the second driving motor.

9. The power-assisted steering system according to claim 2 , wherein the remote control device comprises a remote controller and a remote receiver, wherein the remote receiver is adapted to receive the travelling instruction transmitted from the remote controller and transmit the travelling instruction to the central control unit.

10. The power-assisted steering system according to claim 2 , wherein the steering device comprises a hydraulic directional control valve and a hydraulic motor, wherein the hydraulic motor is connected to each of the hydraulic directional control valve and the steering wheel;
the central control unit is further configured to: control the hydraulic directional control valve according to the travelling instruction so as to select an oil path through which oil will be supplied to the hydraulic motor, such that the hydraulic motor controls steering of the steering wheel according to the selected oil path.

11. The power-assisted steering system according to claim 2 , further comprising a second driving motor;
the central control unit is further configured to: after controlling to start the first driving motor, control to start the second driving motor so as to power a vehicle.

12. The power-assisted steering system according to claim 1 , further comprising a second driving motor;
the central control unit is further configured to: after controlling to start the first driving motor, control to start the second driving motor so as to power a vehicle.

13. The power-assisted steering system according to claim 12 , wherein the central control unit is configured to: after controlling to start the first driving motor for a predetermined period of time, control to start the second driving motor.

14. A mobile inspection device, comprising: a vehicle, a radiation source and a detection device that are disposed on the vehicle, wherein the vehicle comprises a power-assisted steering system, wherein
the power-assisted steering system comprises: a central control unit, a power-assisted steering motor and a first hydraulic pump connected to an engine on chassis, wherein the power-assisted steering system further comprises a directional control valve, a second hydraulic pump and a first driving motor, wherein the first driving motor is connected to the second hydraulic pump; the directional control valve is connected to each of the first hydraulic pump, the second hydraulic pump and the power-assisted steering motor so as to switch between a first oil path of the first hydraulic pump and a second oil path of the second hydraulic pump for driving the power-assisted steering motor;
the central control unit is configured to: when receiving a travelling instruction, determine whether the engine on chassis has been started; and if the engine on chassis has not been started, control to start the first driving motor such that the first driving motor drives the second hydraulic pump and thus the power-assisted steering motor can be driven through the second oil path of the second hydraulic pump.

15. The mobile inspection device according to claim 14 , wherein the power-assisted steering system further comprises a remote control device and a steering device connected to a steering wheel;
the central control unit is further configured to: receive the travelling instruction transmitted from the remote control device; and when determining the engine on chassis has not been start

Assignees

• Nuctech Co Ltd
• Nuctech Jiangsu Company Ltd

Inventors

• Fan Xuping
• Shi Junping
• Li Ke
• Wang Dongyu

Classifications

• B62D6/00 Primary

  Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits (means for initiating a change in direction B62D1/00; steering valves B62D5/06; combined with means for inclining the vehicle body or wheels on bends B62D9/00) · CPC title

• B62D5/064 Primary

  Pump driven independently from vehicle engine, e.g. electric driven pump (B62D5/065 takes precedence) · CPC title

• B62D5/063

  Pump driven by vehicle engine (B62D5/065 takes precedence) · CPC title

• B62D5/0457 Primary

  characterised by control features of the drive means as such · CPC title

• B62D5/07

  Supply of pressurised fluid for steering also supplying other consumers {; control thereof} · CPC title