CN116215650A - Vehicle steering system and vehicle steering control method - Google Patents
Vehicle steering system and vehicle steering control method Download PDFInfo
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- CN116215650A CN116215650A CN202310276332.1A CN202310276332A CN116215650A CN 116215650 A CN116215650 A CN 116215650A CN 202310276332 A CN202310276332 A CN 202310276332A CN 116215650 A CN116215650 A CN 116215650A
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- oil
- booster
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- assisted
- switching valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0421—Electric motor acting on or near steering gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/14—Steering gears hydraulic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention relates to the technical field of vehicles, and discloses a vehicle steering system and a vehicle steering control method. The vehicle steering system comprises a hydraulic steering gear, a double-winding power-assisted motor and a hydraulic redundancy power-assisted unit, wherein when the switching valve is in a first working state, the first power-assisted oil pump provides high-pressure oil for the hydraulic steering gear, the second power-assisted oil pump idles, the double-winding power-assisted motor provides first power-assisted torque for the hydraulic steering gear, when the first power-assisted oil pump fails, the switching valve can be switched from the first working state to a second working state through flow induction, and when the switching valve is in the second working state, the second power-assisted oil pump provides high-pressure oil for the hydraulic steering gear, and the double-winding power-assisted motor provides second power-assisted torque for the hydraulic steering gear. The invention can meet the requirement of heavy commercial vehicles on high safety in steering under special working conditions, and when the main hydraulic power assistance fails or the electric power assistance fails, the vehicle can still perform normal steering operation.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle steering system and a vehicle steering control method.
Background
With the maturity of intelligent driving technology, more and more vehicles are provided with an electric control hydraulic power steering system. For conventional passenger cars and pickup trucks, a single electric power steering system is provided that is capable of providing sufficient steering power for performing steering operations. For heavy commercial vehicles with a large power-assisted steering requirement, a single electric power-assisted steering system cannot meet the power-assisted steering requirement, and a hydraulic power-assisted steering system must be configured, wherein hydraulic power is mainly power-assisted steering, the electric power-assisted steering system provides supplementary power for realizing steering operation, and the hand power of a driver can be improved and intelligent driving can be realized.
At present, a heavy commercial vehicle mainly adopts a hydraulic power-assisted steering system, and after hydraulic failure occurs, the vehicle cannot normally steer, has larger potential safety hazard and cannot meet the steering requirement of high safety.
Disclosure of Invention
Based on the above problems, the invention aims to provide a vehicle steering system and a vehicle steering control method, which can meet the requirement of a vehicle for larger steering torque, ensure the high safety of vehicle steering, and meet the requirement of a heavy commercial vehicle for high safety of steering under special working conditions, and when the main hydraulic power assist fails or the electric power assist fails, the vehicle can still perform normal steering operation.
In order to achieve the above object, the following technical scheme is provided:
in a first aspect, the present invention provides a vehicle steering system comprising:
a hydraulic steering gear for driving the vehicle to steer;
the double-winding power-assisted motor is used for providing a first power-assisted moment or a second power-assisted moment for the hydraulic steering gear, and the second power-assisted moment is larger than the first power-assisted moment;
the hydraulic redundant power-assisted unit comprises an oil tank, a first power-assisted oil pump, a second power-assisted oil pump and a switching valve, wherein the oil tank is provided with a first oil cavity and a second oil cavity, the first oil cavity is used for providing oil for the first power-assisted oil pump, the second oil cavity is used for providing oil for the second power-assisted oil pump, the first power-assisted oil pump and the second power-assisted oil pump are respectively connected with the hydraulic steering gear through the switching valve, and the switching valve is provided with a first working state and a second working state; when the switching valve is in the first working state, the first booster oil pump provides high-pressure oil for the hydraulic steering gear, the second booster oil pump idles, and the double-winding booster motor provides the first booster torque for the hydraulic steering gear; when the first booster oil pump fails, the switching valve can be switched from the first working state to the second working state through flow induction; when the switching valve is in the second working state, the second power-assisted oil pump provides high-pressure oil for the hydraulic steering gear, and the double-winding power-assisted motor provides second power-assisted torque for the hydraulic steering gear.
As an alternative scheme of the vehicle steering system provided by the invention, an intermediate baffle is arranged in the oil tank, the intermediate baffle divides the inner cavity of the oil tank into the first oil cavity and the second oil cavity, a communication port is arranged on the intermediate baffle, and the first oil cavity is communicated with the second oil cavity through the communication port.
As an alternative scheme of the vehicle steering system provided by the invention, a first oil inlet communicated with the first oil cavity is arranged on the oil tank, a third oil inlet is arranged on the first booster oil pump, and the first oil inlet is communicated with the third oil inlet through a first oil inlet pipe.
As an alternative scheme of the vehicle steering system provided by the invention, the first booster oil pump is provided with the first high-pressure oil inlet, the switching valve is provided with the first high-pressure oil inlet, and the first high-pressure oil inlet is communicated with the first high-pressure oil inlet through the first high-pressure oil pipe.
As an alternative scheme of the vehicle steering system provided by the invention, a second oil inlet communicated with the second oil cavity is arranged on the oil tank, a fourth oil inlet is arranged on the second booster oil pump, and the second oil inlet is communicated with the fourth oil inlet through a second oil inlet pipe.
As an alternative scheme of the vehicle steering system provided by the invention, the second booster oil pump is provided with a second high-pressure oil inlet, the switching valve is provided with a second high-pressure oil inlet, and the second high-pressure oil inlet is communicated with the second high-pressure oil inlet through a second high-pressure oil pipe.
As an alternative scheme of the vehicle steering system provided by the invention, the switching valve is provided with a third oil return port, the oil tank is provided with a second oil return port communicated with the second oil cavity, and the third oil return port is communicated with the second oil return port through a first oil return pipe.
As an alternative scheme of the vehicle steering system provided by the invention, the switching valve is provided with the high-pressure oil outlet, the hydraulic steering gear is provided with the third high-pressure oil outlet, and the high-pressure oil outlet is communicated with the third high-pressure oil outlet through the third high-pressure oil pipe.
As an alternative scheme of the vehicle steering system provided by the invention, a fourth oil return port is arranged on the hydraulic steering gear, a first oil return port communicated with the first oil cavity is arranged on the oil tank, and the fourth oil return port is communicated with the first oil return port through a second oil return pipe.
In a second aspect, the present invention further provides a vehicle steering control method, with the vehicle steering system, the vehicle steering control method comprising:
when the first booster oil pump works normally, the switching valve is in a first working state, the first booster oil pump provides high-pressure oil for the hydraulic steering gear, the second booster oil pump idles, and the double-winding booster motor provides first booster torque for the hydraulic steering gear;
when the first booster oil pump fails, the switching valve can be switched from the first working state to the second working state through flow induction, and when the switching valve is in the second working state, the second booster oil pump provides high-pressure oil for the hydraulic steering gear, and the double-winding booster motor provides second booster torque for the hydraulic steering gear.
The beneficial effects of the invention are as follows:
according to the vehicle steering system provided by the invention, the vehicle is driven to steer through the hydraulic steering gear, the double-winding power-assisted motor provides electric power assistance with a double redundancy mechanism for the vehicle steering, and the hydraulic redundancy power-assisted unit provides hydraulic power assistance with the double redundancy mechanism for the vehicle steering, so that the requirement of heavy commercial vehicles on high steering safety under special working conditions is met, and when the main hydraulic power assistance fails or the electric power assistance fails, the vehicle can still perform normal steering operation; when the first booster oil pump works normally, the switching valve is in a first working state, the first booster oil pump provides high-pressure oil for the hydraulic steering gear, the second booster oil pump idles, the double-winding booster motor provides first booster torque for the hydraulic steering gear, the double-winding booster motor provides functions of vehicle-mounted booster, active centering and the like, and driving comfort is improved; when the first booster oil pump breaks down, the switching valve can be switched to the second working state from the first working state through flow induction, when the switching valve is in the second working state, the second booster oil pump provides high-pressure oil for the hydraulic steering gear, the double-winding booster motor provides second booster torque for the hydraulic steering gear, the requirement of larger steering torque is met, and the high safety of vehicle steering is guaranteed.
According to the vehicle steering control method provided by the invention, the vehicle is driven to steer through the hydraulic steering gear, the double-winding power-assisted motor provides electric power assistance with a double-redundancy mechanism for the vehicle steering, and the hydraulic redundancy power-assisted unit provides hydraulic power assistance with the double-redundancy mechanism for the vehicle steering, so that the requirement of heavy commercial vehicles on high steering safety under special working conditions is met, and when the main hydraulic power assistance fails or the electric power assistance fails, the vehicle can still perform normal steering operation; when the first booster oil pump works normally, the switching valve is in a first working state, the first booster oil pump provides high-pressure oil for the hydraulic steering gear, the second booster oil pump idles, the double-winding booster motor provides first booster torque for the hydraulic steering gear, the double-winding booster motor provides functions of vehicle-mounted booster, active centering and the like, and driving comfort is improved; when the first booster oil pump breaks down, the switching valve can be switched to the second working state from the first working state through flow induction, when the switching valve is in the second working state, the second booster oil pump provides high-pressure oil for the hydraulic steering gear, the double-winding booster motor provides second booster torque for the hydraulic steering gear, the requirement of larger steering torque is met, and the high safety of vehicle steering is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic illustration of a vehicle steering system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation principle of the vehicle steering system according to the embodiment of the present invention when the first booster oil pump is operating normally;
fig. 3 is a schematic diagram of the working principle of the steering system of the vehicle according to the embodiment of the invention when the first booster oil pump fails.
In the figure:
11. an oil tank; 111. a first oil chamber; 112. a second oil chamber; 113. a middle partition plate; 1131. a communication port; 1111. a first oil inlet; 1112. a first oil return port; 1121. a second oil inlet; 1122. a second oil return port; 12. a first oil inlet pipe; 13. a first booster oil pump; 131. a third oil inlet; 132. a first high-pressure oil port; 133. a power take-off gear; 14. a first high pressure oil line; 15. a switching valve; 151. a first high-pressure oil inlet; 152. a high-pressure oil outlet; 153. a second high-pressure oil inlet; 154. a third oil return port; 155. the working state monitoring module; 16. a second oil inlet pipe; 17. a second booster oil pump; 171. a fourth oil inlet; 172. the second high-pressure oil port; 173. a power take-off shaft; 18. a second high pressure oil line; 19. a first oil return pipe; 20. a third high pressure oil line; 21. a hydraulic steering gear; 211. a third high-pressure oil port; 212. a fourth oil return port; 213. an input shaft; 22. a double-winding booster motor; 23. and the second oil return pipe.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 3, the present embodiment provides a vehicle steering system including a hydraulic steering gear 21, a double-winding assist motor 22, and a hydraulic redundant assist unit, the hydraulic steering gear 21 being for driving the vehicle to steer. The double-winding assist motor 22 is configured to provide the hydraulic steering gear 21 with a first assist torque or a second assist torque, the second assist torque being greater than the first assist torque. The hydraulic redundant booster unit comprises an oil tank 11, a first booster oil pump 13, a second booster oil pump 17 and a switching valve 15, wherein the oil tank 11 is provided with a first oil cavity 111 and a second oil cavity 112, the first oil cavity 111 is used for providing oil for the first booster oil pump 13, the second oil cavity 112 is used for providing oil for the second booster oil pump 17, the first booster oil pump 13 and the second booster oil pump 17 are respectively connected with a hydraulic steering gear 21 through the switching valve 15, and the switching valve 15 is provided with a first working state and a second working state. When the switching valve 15 is in the first working state, the first booster oil pump 13 supplies high-pressure oil to the hydraulic steering gear 21, the second booster oil pump 17 idles, and the double-winding booster motor 22 supplies a first booster torque to the hydraulic steering gear 21. When the first booster oil pump 13 fails, the switching valve 15 can be switched from the first operating state to the second operating state by flow sensing. When the switching valve 15 is in the second working state, the second booster oil pump 17 supplies high-pressure oil to the hydraulic steering gear 21, and the double-winding booster motor 22 supplies a second booster torque to the hydraulic steering gear 21.
The hydraulic steering gear 21 is used for driving the vehicle to steer, the double-winding power-assisted motor 22 is used for providing electric power with a double-redundancy mechanism for the vehicle to steer, and the hydraulic redundancy power-assisted unit is used for providing hydraulic power with the double-redundancy mechanism for the vehicle to steer, so that the requirement of heavy commercial vehicles on high steering safety under special working conditions is met, and when the main hydraulic power assistance fails or the electric power assistance fails, the vehicle can still perform normal steering operation; when the first booster oil pump 13 works normally, the switching valve 15 is in a first working state, the first booster oil pump 13 provides high-pressure oil for the hydraulic steering gear 21, the second booster oil pump 17 idles, the double-winding booster motor 22 provides first booster torque for the hydraulic steering gear 21, the double-winding booster motor 22 provides functions of vehicle-mounted booster, active centering and the like, and driving comfort is improved; when the first booster oil pump 13 fails, the switching valve 15 can be switched from the first working state to the second working state through flow induction, and when the switching valve 15 is in the second working state, the second booster oil pump 17 provides high-pressure oil for the hydraulic steering gear 21, the double-winding booster motor 22 provides second booster torque for the hydraulic steering gear 21, the requirement of larger steering torque is met, and the high safety of vehicle steering is ensured.
The hydraulic steering gear 21 is used for main steering assistance of a vehicle, and the hydraulic steering gear 21 is provided with an input shaft 213 and an output shaft, the input shaft 213 being connected to a steering wheel, and the output shaft being connected to wheels. The double-winding booster motor 22 is integrated on the hydraulic steering gear 21, and the torque of the double-winding booster motor 22 acts on the input shaft 213 of the hydraulic steering gear 21. The first booster oil pump 13 is provided with a power taking gear 133, and the power taking gear 133 of the first booster oil pump 13 is connected with a power taking interface of an engine, so that the power taking gear is a power source for main hydraulic power assistance of a vehicle. The second booster oil pump 17 is provided with a power take-off shaft 173, and the power source of the second booster oil pump 17 may be a mechanical power take-off port or an electric booster. The hydraulic steering gear 21 may be of a recirculating ball-and-pinion type or of a rack-and-pinion type. The power interface of the double-winding booster motor 22 is connected with a vehicle storage battery, and the CAN communication interface of the double-winding booster motor 22 is connected with a whole vehicle CAN. When the first booster oil pump 13 breaks down, the working state monitoring module 155 of the switching valve 15 sends a fault failure signal to the whole vehicle, signal interaction is realized through the CAN network and the double-winding booster motor 22, the double-winding booster motor 22 provides larger steering booster, the auxiliary second booster oil pump 17 provides steering booster for the whole vehicle together, the larger steering torque requirement is met, and the high safety of vehicle steering is ensured.
Optionally, an intermediate baffle 113 is disposed in the oil tank 11, the intermediate baffle 113 divides the inner cavity of the oil tank 11 into a first oil cavity 111 and a second oil cavity 112, a communication port 1131 is disposed on the intermediate baffle 113, and the first oil cavity 111 is communicated with the second oil cavity 112 through the communication port 1131. Under the action of the communication port 1131, the first oil cavity 111 and the second oil cavity 112 are communicated with each other at a certain height to form a communicating vessel, so that the uneven oil in the first oil cavity 111 and the second oil cavity 112 is avoided.
In order to facilitate the first oil cavity 111 to provide oil to the first booster oil pump 13, optionally, a first oil inlet 1111 is provided on the oil tank 11 and is communicated with the first oil cavity 111, a third oil inlet 131 is provided on the first booster oil pump 13, and the first oil inlet 1111 is communicated with the third oil inlet 131 through a first oil inlet pipe 12.
In order to facilitate the first booster oil pump 13 to provide high-pressure oil to the switching valve 15, optionally, a first high-pressure oil inlet 132 is provided on the first booster oil pump 13, a first high-pressure oil inlet 151 is provided on the switching valve 15, and the first high-pressure oil inlet 132 is communicated with the first high-pressure oil inlet 151 through the first high-pressure oil pipe 14.
In order to facilitate the second oil chamber 112 to provide oil to the second booster oil pump 17, optionally, a second oil inlet 1121 communicating with the second oil chamber 112 is provided on the oil tank 11, a fourth oil inlet 171 is provided on the second booster oil pump 17, and the second oil inlet 1121 communicates with the fourth oil inlet 171 through the second oil inlet pipe 16.
In order to facilitate the second booster oil pump 17 to provide the high-pressure oil to the switching valve 15, optionally, a second high-pressure oil inlet 172 is provided on the second booster oil pump 17, and a second high-pressure oil inlet 153 is provided on the switching valve 15, where the second high-pressure oil inlet 172 is communicated with the second high-pressure oil inlet 153 through a second high-pressure oil pipe 18.
To facilitate oil return during idle running of the second booster oil pump 17, optionally, a third oil return port 154 is provided on the switching valve 15, a second oil return port 1122 is provided on the oil tank 11 and is in communication with the second oil chamber 112, and the third oil return port 154 is in communication with the second oil return port 1122 through the first oil return pipe 19.
In order to facilitate the switching valve 15 to provide high-pressure oil to the hydraulic steering gear 21, optionally, a high-pressure oil outlet 152 is provided on the switching valve 15, a third high-pressure oil outlet 211 is provided on the hydraulic steering gear 21, and the high-pressure oil outlet 152 is communicated with the third high-pressure oil outlet 211 through a third high-pressure oil pipe 20.
For oil return convenience, optionally, a fourth oil return port 212 is provided on the hydraulic steering gear 21, a first oil return port 1112 communicating with the first oil chamber 111 is provided on the oil tank 11, and the fourth oil return port 212 communicates with the first oil return port 1112 through a second oil return pipe 23.
As shown in fig. 1 and 2, when the first hydraulic assist normally works, the first hydraulic assist oil flows from the first oil inlet 1111 through the first oil inlet pipe 12 into the third oil inlet 131, becomes high-pressure oil through the first assist oil pump 13, flows out from the first high-pressure oil port 132, flows into the first high-pressure oil inlet 151 through the first high-pressure oil pipe 14, flows into the third high-pressure oil port 211 through the third high-pressure oil pipe 20 through the high-pressure oil outlet 152, and pushes the vehicle to turn to normally work, and the oil returns from the fourth oil return port 212 to the first oil return port 1112 through the second oil return pipe 23; the second hydraulic power-assisted oil flows into the fourth oil inlet 171 from the second oil inlet 1121 through the second oil inlet pipe 16, flows out from the second high-pressure oil port 172 through the second power-assisted oil pump 17, flows into the second high-pressure oil inlet 153 through the second high-pressure oil pipe 18, and returns to the second oil return port 1122 from the third oil return port 154 through the first oil return pipe 19 for idle running; the double-winding booster motor 22 plays a role in assisting intelligent driving at this time, and does not participate in larger steering force output.
As shown in fig. 1 and 3, when the first hydraulic power fails and the flow rate drops to the set value of the switching valve 15, the hydraulic power is switched to the second hydraulic power-driven hydraulic power steering device 21 to provide main power for steering the vehicle, and meanwhile, the working state monitoring module 155 transmits failure information of the first steering power to the whole vehicle CAN, and then the whole vehicle increases torque output through the CAN-controlled double-winding power-assisted motor 22 to meet the requirement of larger steering force of the vehicle. At this time, the first hydraulic power-assisted oil flows from the first oil inlet 1111 through the first oil inlet pipe 12 into the third oil inlet 131, flows out from the first high-pressure oil port 132 through the first power-assisted oil pump 13, flows into the first high-pressure oil inlet 151 through the first high-pressure oil pipe 14, flows into the third high-pressure oil port 211 through the third high-pressure oil pipe 20 from the high-pressure oil outlet 152 through the overflow valve inside the switching valve 15, and returns to the first oil return port 1112 through the second oil return pipe 23 from the fourth oil return port 212; the second hydraulic power-assisted oil flows into the fourth oil inlet 171 from the second oil inlet 1121 through the second oil inlet pipe 16, flows out from the second high-pressure oil port 172 through the second power-assisted oil pump 17, flows into the second high-pressure oil inlet 153 through the second high-pressure oil pipe 18, flows into the third high-pressure oil port 211 through the third high-pressure oil pipe 20, returns to the first oil return port 1112 from the fourth oil return port 212 through the second oil return pipe 23, flows into the first oil cavity 111 at this time, and flows into the oil tank 11 from a certain amount of oil through the communicating port 1131 on the middle partition plate 113, so that the oil balance is maintained, and the oil shortage condition of the second oil cavity 112 is avoided.
It can be appreciated that the dual-winding booster motor 22 corresponds to two control units and related components, and has a redundant auxiliary electric booster function, and the two control units and the related components communicate with each other to determine whether each module functions normally. Under normal conditions, the first control module motor provides steering power, and when one winding fails in function, the other winding intervenes in work to provide steering electric power; when the first hydraulic assist is normal, the two-winding assist motor 22 provides only a small assist for intelligent driving and improved hand force; when a failure of the first hydraulic assist of the system is detected, the dual-winding assist motor 22 provides greater steering assist, and is used in combination with the second hydraulic assist to meet the safety requirements of heavy commercial vehicles for greater steering force.
According to the vehicle steering system provided by the embodiment, the hydraulic steering gear 21 drives the vehicle to steer, the double-winding power-assisted motor 22 provides electric power assistance of a double-redundancy mechanism for the vehicle to steer, and the hydraulic redundancy power-assisted unit provides hydraulic power assistance of the double-redundancy mechanism for the vehicle to steer, so that the requirement of heavy commercial vehicles on high steering safety under special working conditions is met, and when the main hydraulic power assistance fails or the electric power assistance fails, the vehicle can still perform normal steering operation; when the first booster oil pump 13 works normally, the switching valve 15 is in a first working state, the first booster oil pump 13 provides high-pressure oil for the hydraulic steering gear 21, the second booster oil pump 17 idles, the double-winding booster motor 22 provides first booster torque for the hydraulic steering gear 21, the double-winding booster motor 22 provides functions of vehicle-mounted booster, active centering and the like, and driving comfort is improved; when the first booster oil pump 13 fails, the switching valve 15 can be switched from the first working state to the second working state through flow induction, and when the switching valve 15 is in the second working state, the second booster oil pump 17 provides high-pressure oil for the hydraulic steering gear 21, the double-winding booster motor 22 provides second booster torque for the hydraulic steering gear 21, the requirement of larger steering torque is met, and the high safety of vehicle steering is ensured.
The embodiment also provides a vehicle steering control method, which adopts the vehicle steering system, and comprises the following steps:
when the first booster oil pump 13 works normally, the switching valve 15 is in a first working state, the first booster oil pump 13 supplies high-pressure oil to the hydraulic steering gear 21, the second booster oil pump 17 idles, and the double-winding booster motor 22 supplies first booster torque to the hydraulic steering gear 21;
when the first booster oil pump 13 fails, the switching valve 15 can be switched from the first working state to the second working state through flow induction, and when the switching valve 15 is in the second working state, the second booster oil pump 17 provides high-pressure oil for the hydraulic steering gear 21, and the double-winding booster motor 22 provides second booster torque for the hydraulic steering gear 21.
Specifically, as shown in fig. 1 and 2, when the first hydraulic assist is operating normally, the first hydraulic assist oil flows from the first oil inlet 1111 through the first oil inlet pipe 12 into the third oil inlet 131, becomes high-pressure oil through the first assist oil pump 13, flows out from the first high-pressure oil port 132, flows into the first high-pressure oil inlet 151 through the first high-pressure oil pipe 14, flows into the third high-pressure oil port 211 through the third high-pressure oil pipe 20 through the high-pressure oil outlet 152, pushes the vehicle to turn to operate normally, and returns from the fourth oil return port 212 to the first oil return port 1112 through the second oil return pipe 23; the second hydraulic power-assisted oil flows into the fourth oil inlet 171 from the second oil inlet 1121 through the second oil inlet pipe 16, flows out from the second high-pressure oil port 172 through the second power-assisted oil pump 17, flows into the second high-pressure oil inlet 153 through the second high-pressure oil pipe 18, and returns to the second oil return port 1122 from the third oil return port 154 through the first oil return pipe 19 for idle running; the double-winding booster motor 22 plays a role in assisting intelligent driving at this time, and does not participate in larger steering force output.
As shown in fig. 1 and 3, when the first hydraulic power fails and the flow rate drops to the set value of the switching valve 15, the hydraulic power is switched to the second hydraulic power-driven hydraulic power steering device 21 to provide main power for steering the vehicle, and meanwhile, the working state monitoring module 155 transmits failure information of the first steering power to the whole vehicle CAN, and then the whole vehicle increases torque output through the CAN-controlled double-winding power-assisted motor 22 to meet the requirement of larger steering force of the vehicle. At this time, the first hydraulic power-assisted oil flows from the first oil inlet 1111 through the first oil inlet pipe 12 into the third oil inlet 131, flows out from the first high-pressure oil port 132 through the first power-assisted oil pump 13, flows into the first high-pressure oil inlet 151 through the first high-pressure oil pipe 14, flows into the third high-pressure oil port 211 through the third high-pressure oil pipe 20 from the high-pressure oil outlet 152 through the overflow valve inside the switching valve 15, and returns to the first oil return port 1112 through the second oil return pipe 23 from the fourth oil return port 212; the second hydraulic power-assisted oil flows into the fourth oil inlet 171 from the second oil inlet 1121 through the second oil inlet pipe 16, flows out from the second high-pressure oil port 172 through the second power-assisted oil pump 17, flows into the second high-pressure oil inlet 153 through the second high-pressure oil pipe 18, flows into the third high-pressure oil port 211 through the third high-pressure oil pipe 20, returns to the first oil return port 1112 from the fourth oil return port 212 through the second oil return pipe 23, flows into the first oil cavity 111 at this time, and flows into the oil tank 11 from a certain amount of oil through the communicating port 1131 on the middle partition plate 113, so that the oil balance is maintained, and the oil shortage condition of the second oil cavity 112 is avoided.
According to the vehicle steering control method provided by the embodiment, the hydraulic steering gear 21 is used for driving the vehicle to steer, the double-winding power-assisted motor 22 is used for providing electric power assistance of a double-redundancy mechanism for the vehicle to steer, and the hydraulic redundancy power-assisted unit is used for providing hydraulic power assistance of the double-redundancy mechanism for the vehicle to steer, so that the requirement of heavy commercial vehicles on high steering safety under special working conditions is met, and when the main hydraulic power assistance fails or the electric power assistance fails, the vehicle can still perform normal steering operation; when the first booster oil pump 13 works normally, the switching valve 15 is in a first working state, the first booster oil pump 13 provides high-pressure oil for the hydraulic steering gear 21, the second booster oil pump 17 idles, the double-winding booster motor 22 provides first booster torque for the hydraulic steering gear 21, the double-winding booster motor 22 provides functions of vehicle-mounted booster, active centering and the like, and driving comfort is improved; when the first booster oil pump 13 fails, the switching valve 15 can be switched from the first working state to the second working state through flow induction, and when the switching valve 15 is in the second working state, the second booster oil pump 17 provides high-pressure oil for the hydraulic steering gear 21, the double-winding booster motor 22 provides second booster torque for the hydraulic steering gear 21, the requirement of larger steering torque is met, and the high safety of vehicle steering is ensured.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A vehicle steering system, comprising:
a hydraulic steering gear (21) for driving the vehicle to steer;
-a double-winding booster motor (22) for providing the hydraulic steering gear (21) with a first booster torque or a second booster torque, the second booster torque being greater than the first booster torque;
the hydraulic redundancy power-assisted unit comprises an oil tank (11), a first power-assisted oil pump (13), a second power-assisted oil pump (17) and a switching valve (15), wherein the oil tank (11) is provided with a first oil cavity (111) and a second oil cavity (112), the first oil cavity (111) is used for providing oil for the first power-assisted oil pump (13), the second oil cavity (112) is used for providing oil for the second power-assisted oil pump (17), the first power-assisted oil pump (13) and the second power-assisted oil pump (17) are respectively connected with the hydraulic steering gear (21) through the switching valve (15), and the switching valve (15) is provided with a first working state and a second working state; when the switching valve (15) is in the first working state, the first booster oil pump (13) provides high-pressure oil for the hydraulic steering gear (21), the second booster oil pump (17) idles, and the double-winding booster motor (22) provides the first booster torque for the hydraulic steering gear (21); when the first booster oil pump (13) fails, the switching valve (15) can be switched from the first working state to the second working state through flow induction; when the switching valve (15) is in the second working state, the second power-assisted oil pump (17) provides high-pressure oil for the hydraulic steering gear (21), and the double-winding power-assisted motor (22) provides the second power-assisted torque for the hydraulic steering gear (21).
2. The vehicle steering system according to claim 1, wherein an intermediate partition plate (113) is provided in the oil tank (11), the intermediate partition plate (113) divides an inner cavity of the oil tank (11) into the first oil chamber (111) and the second oil chamber (112), a communication port (1131) is provided in the intermediate partition plate (113), and the first oil chamber (111) is communicated with the second oil chamber (112) through the communication port (1131).
3. The vehicle steering system according to claim 1, characterized in that a first oil inlet (1111) communicating with the first oil chamber (111) is provided on the oil tank (11), a third oil inlet (131) is provided on the first booster pump (13), and the first oil inlet (1111) communicates with the third oil inlet (131) through a first oil inlet pipe (12).
4. The vehicle steering system according to claim 1, characterized in that a first high-pressure oil port (132) is provided on the first booster oil pump (13), a first high-pressure oil inlet port (151) is provided on the switching valve (15), and the first high-pressure oil port (132) communicates with the first high-pressure oil inlet port (151) through a first high-pressure oil pipe (14).
5. The vehicle steering system according to claim 1, characterized in that a second oil inlet (1121) communicating with the second oil chamber (112) is provided on the oil tank (11), a fourth oil inlet (171) is provided on the second booster oil pump (17), and the second oil inlet (1121) communicates with the fourth oil inlet (171) through a second oil inlet pipe (16).
6. The vehicle steering system according to claim 1, characterized in that a second high-pressure oil port (172) is provided on the second booster oil pump (17), a second high-pressure oil inlet port (153) is provided on the switching valve (15), and the second high-pressure oil port (172) communicates with the second high-pressure oil inlet port (153) through a second high-pressure oil pipe (18).
7. The vehicle steering system according to claim 1, characterized in that a third oil return port (154) is provided on the switching valve (15), a second oil return port (1122) that communicates with the second oil chamber (112) is provided on the oil tank (11), and the third oil return port (154) communicates with the second oil return port (1122) through a first oil return pipe (19).
8. The vehicle steering system according to claim 1, characterized in that a high-pressure oil outlet (152) is provided on the switching valve (15), a third high-pressure oil outlet (211) is provided on the hydraulic steering gear (21), and the high-pressure oil outlet (152) is communicated with the third high-pressure oil outlet (211) through a third high-pressure oil pipe (20).
9. The vehicle steering system according to claim 1, characterized in that a fourth oil return port (212) is provided on the hydraulic steering gear (21), a first oil return port (1112) communicating with the first oil chamber (111) is provided on the oil tank (11), and the fourth oil return port (212) communicates with the first oil return port (1112) through a second oil return pipe (23).
10. A vehicle steering control method, characterized in that a vehicle steering system according to any one of claims 1 to 9 is employed, the vehicle steering control method comprising:
when the first booster oil pump (13) works normally, the switching valve (15) is in a first working state, the first booster oil pump (13) provides high-pressure oil for the hydraulic steering gear (21), the second booster oil pump (17) idles, and the double-winding booster motor (22) provides first booster torque for the hydraulic steering gear (21);
when the first booster oil pump (13) fails, the switching valve (15) can be switched from the first working state to the second working state through flow induction, and when the switching valve (15) is in the second working state, the second booster oil pump (17) provides high-pressure oil for the hydraulic steering gear (21), and the double-winding booster motor (22) provides second booster torque for the hydraulic steering gear (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310276332.1A CN116215650A (en) | 2023-03-21 | 2023-03-21 | Vehicle steering system and vehicle steering control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310276332.1A CN116215650A (en) | 2023-03-21 | 2023-03-21 | Vehicle steering system and vehicle steering control method |
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| CN116215650A true CN116215650A (en) | 2023-06-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116620387A (en) * | 2023-06-06 | 2023-08-22 | 南京航空航天大学 | Redundant electrohydraulic composite steering system and fault-tolerant control method thereof |
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2023
- 2023-03-21 CN CN202310276332.1A patent/CN116215650A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116620387A (en) * | 2023-06-06 | 2023-08-22 | 南京航空航天大学 | Redundant electrohydraulic composite steering system and fault-tolerant control method thereof |
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