CN213862399U - Auxiliary energy accumulator type electric hydraulic power-assisted steering system - Google Patents
Auxiliary energy accumulator type electric hydraulic power-assisted steering system Download PDFInfo
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- CN213862399U CN213862399U CN202023085919.5U CN202023085919U CN213862399U CN 213862399 U CN213862399 U CN 213862399U CN 202023085919 U CN202023085919 U CN 202023085919U CN 213862399 U CN213862399 U CN 213862399U
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Abstract
The utility model discloses an electronic power assisted steering system of supplementary energy accumulator formula, include: the hydraulic steering system comprises a steering wheel, a steering shaft, an integral circulating ball type power steering device, an oil storage tank, a hydraulic pump, a pressure limiting valve, a one-way valve, an energy accumulator, a steering wheel torque and angle sensor, an energy accumulator pressure sensor, an EHPS system controller, a motor controller, a power-assisted motor, an electromagnetic pressure reducing valve, a first electromagnetic switch valve and a second electromagnetic switch valve. In the initial stage of the system, when the rotation speed of the power-assisted motor rises only under the steering working condition, the energy accumulator and the hydraulic pump convey hydraulic oil to the integral circulating ball type power steering gear together, the power-assisted response speed is improved, the power-assisted is easy to control accurately, the internal pressure of the energy accumulator is far smaller than that of a normal pressure type hydraulic power steering system, the utilization rate of pressure oil stored by the energy accumulator is high, and energy is saved.
Description
Technical Field
The utility model relates to a large automobile hydraulic pressure power assisted steering system, concretely relates to electronic hydraulic pressure power assisted steering system of supplementary energy accumulator formula that electricelectric moves large-scale car and uses.
Background
The normal-pressure electric hydraulic power-assisted steering system uses a high-pressure energy accumulator, a hydraulic oil way is always maintained in a high-pressure state of more than 10Mpa, the requirement on hydraulic elements is high, the service life is shortened, and the normal-flow type hydraulic power-assisted steering system is commonly used in the traditional large-sized automobile. With the development of automobile electromotion, motors and control technologies thereof, the constant-current electric hydraulic power steering system is widely applied to a pure electric large automobile. In order to ensure the power-assisted response speed of the system and avoid the delayed feeling of the driver's power-assisted caused by the delayed response of the power-assisted motor and the hydraulic pump, when the vehicle is in a non-steering working condition, the power-assisted motor and the hydraulic pump in the conventional constant-flow type electric hydraulic power-assisted steering system continuously run at a certain speed, which inevitably causes the waste of energy. Chinese patent CN107117206 proposes an energy storage type electric hydraulic power steering apparatus, which uses double hydraulic pipelines to provide power for a steering system, thereby improving the response speed of steering and saving energy. Chinese patent CN20120035944.2 provides an electric hydraulic power steering system of a new energy bus, which adopts a main control loop and auxiliary control loop double-loop and sub-working condition combined control power-assisted mode to reduce energy consumption and simultaneously realize quick response. China patent CN201720404546.2 provides an energy storage electric hydraulic hybrid power steering system for a commercial vehicle, which greatly reduces the loss of high-pressure hydraulic oil during small-angle steering. However, under the working condition of large power-assisted steering requirement, the three schemes all require the energy accumulator to participate in power assistance, the pressure of oil stored in the energy accumulator is equal to or close to the normal pressure, and the system is in a high-pressure state for a long time; when the energy accumulator, the motor and the hydraulic pump supply oil simultaneously, the pressure of the oil stored in the energy accumulator is reduced along with the release of the oil, and the difficulty of the precise control of the power assisting is increased.
SUMMERY OF THE UTILITY MODEL
In order to overcome current normal flow formula electro-hydraulic power steering system and continue the energy waste at non-steering operating mode helping hand motor, perhaps for reducing the energy consumption and the energy storage ware pressure that leads to is too high and be difficult to the not enough of accurate control at helping hand later stage helping hand size, the utility model provides an auxiliary energy storage ware formula electro-hydraulic power steering system, this system energy storage ware storage oil hydraulic pressure force obviously is less than normal pressure formula, the easy accurate control of helping hand, energy storage ware storage pressure oil high-usage, the energy saving.
The utility model provides a technical scheme that its technical problem adopted is: an auxiliary energy accumulator type electric hydraulic power-assisted steering system comprises a mechanical hydraulic part and an electric part. The mechanical hydraulic part mainly comprises: the hydraulic steering system comprises a steering wheel, a steering shaft, an integral circulating ball type power steering device, an oil storage tank, a hydraulic pump, an energy accumulator, a pressure limiting valve, a one-way valve and a corresponding hydraulic pipe; the electric appliance part mainly comprises: the hydraulic control system comprises a power-assisted motor, an electromagnetic pressure reducing valve, an EHPS system controller, a motor controller, a steering wheel torque and angle sensor, an energy accumulator pressure sensor, a first electromagnetic switch valve and a second electromagnetic switch valve. An oil storage tank, a hydraulic pump, a one-way valve, a first electromagnetic switch valve, a steering control valve in the integral circulating ball type power steering gear and a power-assisted oil cylinder in the steering system are connected through oil pipes to form a main hydraulic oil way for steering assistance; an energy accumulator is arranged on a connecting oil pipe between the one-way valve and the first electromagnetic switch valve, an electromagnetic pressure reducing valve, a second electromagnetic switch valve and an energy accumulator pressure sensor are arranged between the energy accumulator and the main hydraulic pipeline, an auxiliary hydraulic oil circuit is formed by the oil storage tank, the hydraulic pump, the one-way valve, the second electromagnetic switch valve, the energy accumulator and the electromagnetic pressure reducing valve, and a pressure limiting valve is arranged between the outlet of the hydraulic pump and the oil storage tank. The steering wheel is connected with the integral circulating ball type power steering gear through a steering shaft, a steering wheel torque and angle sensor is arranged in the middle of the steering shaft, and the hydraulic pump is driven by a power-assisted motor. The EHPS system controller acquires steering wheel torque and corner signals through a steering wheel torque corner sensor, acquires oil hydraulic pressure signals stored by an energy accumulator through an energy accumulator pressure sensor, and acquires vehicle speed signals through vehicle-mounted network communication; the output end of the EHPS system controller is respectively connected with the first electromagnetic switch valve, the electromagnetic pressure reducing valve, the second electromagnetic switch valve and the motor controller. And the EHPS system controller judges whether the vehicle is in a steering working condition or not according to the steering wheel rotating angle signal, if the steering wheel rotating angle is larger than or equal to the free stroke, the vehicle is in the steering working condition, and if not, the vehicle is in the non-steering working condition. When the vehicle is in a steering working condition, the EHPS system controller opens the first electromagnetic switch valve, determines the target rotating speed of the power-assisted motor in the current working condition according to the torque of a steering wheel, a corner signal and a vehicle speed signal and sends the target rotating speed to the motor controller, and the motor controller performs speed regulation control on the power-assisted motor according to the target rotating speed; meanwhile, in the initial stage of the increase of the rotation speed of the power-assisted motor, the EHPS system controller determines a target pressure value of output oil of the electromagnetic pressure reducing valve (generally lower than 50% of the pressure difference between two sides of a piston of the power-assisted cylinder under the steering working condition) according to the target rotation speed of the power-assisted motor, a certain exciting current is input to the electromagnetic pressure reducing valve to enable the electromagnetic pressure reducing valve to reduce the pressure and output the oil with the target pressure, the energy accumulator and the hydraulic pump together convey hydraulic oil to a steering control valve in the integral circulating ball type power steering gear, the energy accumulator assists in power assistance and improves the power-assisted response speed of the whole system; when the pressure of the main oil passage is greater than or equal to the output pressure of the pressure reducing valve, the pressure reducing valve is automatically closed, and the hydraulic pump independently supplies oil to the steering control valve in the main hydraulic oil passage. When the vehicle is in a non-steering working condition, if the pressure of the energy accumulator is lower than a set lower limit value, the EHPS system controller opens the second electromagnetic switch valve, sends an oil supplementing rotating speed signal of the energy accumulator to the motor controller, the motor controller starts the power-assisted motor, drives the hydraulic pump to charge the energy accumulator, and closes the second electromagnetic switch valve when the pressure reaches a set upper limit value, and the power-assisted motor stops working; and if the internal pressure of the energy accumulator is higher than the set lower limit value, the system state is unchanged, and the power-assisted motor stops working.
The utility model has the advantages that: at the initial stage of the rising of the rotating speed of the power-assisted motor, the energy accumulator and the hydraulic pump together deliver hydraulic oil to a steering control valve in the integral circulating ball type power steering gear, so that the system still has good power-assisted response speed when the power-assisted motor does not work continuously under the non-steering working condition. The energy accumulator only assists in working at the initial stage of the rise of the rotation speed of the power-assisted motor, the internal pressure is far less than that of a normal-pressure type hydraulic power-assisted steering system, and the service life of a hydraulic element can be effectively prevented from being greatly reduced and oil in the system can be effectively prevented from leaking; after the energy accumulator is withdrawn from work, the boosting force is completely dependent on the rotating speed of the boosting motor and is not influenced by the oil output by the energy accumulator, and the boosting force is easy to control accurately. The electromagnetic pressure reducing valve is arranged at the outlet of the energy accumulator, so that the pressure of the stored oil liquid of the energy accumulator under the non-steering working condition can be set and controlled conveniently, unnecessary release of the oil liquid in the energy accumulator caused by reduction of the pressure of the stored oil liquid of the energy accumulator along with the increase of the running speed of the vehicle is avoided, and further energy is saved.
Drawings
Fig. 1 is a schematic structural view of the auxiliary energy accumulator type electro-hydraulic power steering system of the present invention.
In the figure, 1, a steering wheel, 2, a steering shaft, 3, a steering wheel torque and angle sensor, 4, an integral circulating ball type power steering gear, 5, a first electromagnetic switch valve, 6, a second electromagnetic switch valve, 7, a pressure limiting valve, 8, an oil storage tank, 9, a hydraulic pump, 10, a one-way valve, 11, a power-assisted motor, 12, a motor controller, 13, an EHPS system controller, 14, an electromagnetic pressure reducing valve, 15, an energy accumulator pressure sensor and 16, an energy accumulator are arranged.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and the detailed description.
The attached figure 1 is a structural schematic diagram of an auxiliary energy accumulator type electric hydraulic power-assisted steering system, which comprises a steering wheel (1), a steering shaft (2), a steering wheel torque angle sensor (3), an integral circulating ball type power steering gear (4), a first electromagnetic switch valve (5), a second electromagnetic switch valve (6), a pressure limiting valve (7), an oil storage tank (8), a hydraulic pump (9), a one-way valve (10), a power-assisted motor (11), a motor controller (12), an EHPS system controller (13), an electromagnetic pressure reducing valve (14), an energy accumulator pressure sensor (15) and an energy accumulator (16). The connection relationship of each part of the steering system is as follows: the steering wheel (1) is connected with the upper end of a steering shaft (2), the lower end of the steering shaft (2) is connected with the input end of a circulating ball type power steering gear (4), a steering wheel torque and angle sensor (3) is installed in the middle of the steering shaft (2), and a hydraulic pump (9) is connected with a motor shaft of a power-assisted motor (11). The hydraulic pump (9) is connected with an oil outlet of the oil storage tank (8) through an oil inlet pipe, the hydraulic pump (9) is connected with an oil inlet of the one-way valve (10) through an oil outlet pipe, the oil outlet of the one-way valve (10) is connected with an oil inlet of the first electromagnetic switch valve (5) through an oil pipe, and the oil outlet of the first electromagnetic switch valve (5) is connected with an oil inlet of the integral circulating ball type power steering gear (4) through an oil pipe and is close to the oil inlet of the integral circulating ball type power steering gear (4) as far as possible. An interface of an energy accumulator (16) is connected with an oil inlet of an electromagnetic pressure reducing valve (14) through an oil pipe, an oil outlet of the electromagnetic pressure reducing valve (14) is connected to the oil pipe between a one-way valve (10) and a first electromagnetic switch valve (5), an oil inlet of an energy accumulator pressure sensor (15) is connected with the oil pipe between the energy accumulator (16) and the electromagnetic pressure reducing valve (14), an oil inlet of a second electromagnetic switch valve (6) is connected with an oil outlet pipeline of the electromagnetic pressure reducing valve (14) through the oil pipe, an oil outlet of the second electromagnetic switch valve (6) is connected with an oil inlet pipeline of the electromagnetic pressure reducing valve (14) through the oil pipe, an oil inlet of a pressure limiting valve (7) is connected with an oil outlet pipe of a hydraulic pump (9) through the oil pipe, an oil outlet of the pressure limiting valve (7) is connected with an oil return port of an oil storage tank (8) through an oil return pipe, and an oil outlet of an integral circulating ball type power steering gear (4) is connected with an oil return port of the oil storage tank (8) through an oil return pipe. The signal output line of the steering wheel torque and angle sensor (3) is connected with the signal input port of the EHPS system controller (13), the signal output line of the accumulator pressure sensor (15) is connected with the signal input port of the EHPS system controller (13), the network communication interface of the EHPS system controller (13) is connected with the vehicle-mounted network interface of the vehicle, the output port of the EHPS system controller (13) is connected with the first electromagnetic switch valve (5), the output port of the EHPS system controller (13) is connected with the electromagnetic pressure reducing valve (14), the output port of the EHPS system controller (13) is connected with the second electromagnetic switch valve (6), and the output port of the EHPS system controller (13) is connected with the input port of the motor controller (12).
In the embodiment shown in fig. 1, the EHPS system controller (13) determines whether the vehicle is in a steering condition based on a steering wheel angle signal collected from the steering wheel torque angle sensor (3). When the steering wheel rotating angle is larger than or equal to the free stroke, the EHPS system controller (13) judges that the vehicle is in a steering working condition, otherwise, the vehicle is in a non-steering working condition. When the vehicle is in a steering working condition, the EHPS system controller (13) opens the first electromagnetic switch valve (5), determines a target rotating speed of the power-assisted motor (11) under the current working condition according to the torque of a steering wheel, a corner signal and a vehicle speed signal, and sends the target rotating speed to the motor controller (12), and the motor controller (12) performs speed regulation control on the power-assisted motor (11) according to the target rotating speed, so that steering power-assisted control is realized; meanwhile, in the initial stage of the increase of the rotation speed of the power-assisted motor, the EHPS system controller (13) determines the target pressure of output oil of the electromagnetic pressure reducing valve (14) (generally lower than 50% of the pressure difference between two sides of a piston of a power-assisted cylinder under the steering working condition) according to the target rotation speed of the power-assisted motor (11), certain exciting current is input into the electromagnetic pressure reducing valve (14) to enable the electromagnetic pressure reducing valve (14) to output oil of the target pressure, the energy accumulator (16) and the hydraulic pump (9) are used for conveying the hydraulic oil to a steering control valve in the integral circulation ball type power steering gear (4) together, the power-assisted response speed of the whole system is improved, when the pressure in a pipeline behind the one-way valve (10) is larger than or equal to the output pressure of the electromagnetic pressure reducing valve (14), the electromagnetic pressure reducing valve (14) is automatically closed, and the hydraulic pump (9) is used for independently supplying oil to the steering control valve. When the vehicle is in a non-steering working condition, the EHPS system controller (13) acquires a pressure signal of oil stored in the energy accumulator (16) through the energy accumulator pressure sensor (15), judges whether the pressure of the oil stored in the energy accumulator is lower than a preset pressure lower limit value or not, if the pressure of the oil stored in the energy accumulator is lower than the lower limit value, the EHPS system controller (13) opens the second electromagnetic switch valve (6), sends an energy accumulator oil supplementing rotation speed signal to the motor controller (12), the motor controller (12) starts the power-assisted motor (11), drives the hydraulic pump (9) to supplement the oil to the energy accumulator (16), and closes the second electromagnetic switch valve (6) when the pressure reaches a set pressure upper limit value, and the power-assisted motor (11) stops working; if the pressure of the oil stored in the energy accumulator is higher than the set lower limit value, the system state is unchanged, and the power-assisted motor (11) stops working.
The energy accumulator and the hydraulic pump are used for conveying hydraulic oil to the steering control valve in the integral circulating ball type power steering gear at the initial rising stage of the rotating speed of the power-assisted motor, the power-assisted response speed is improved, the power-assisted is controlled accurately and easily, the internal pressure of the energy accumulator is far smaller than that of a normal-pressure type hydraulic power-assisted steering system, and the service life of a hydraulic element can be effectively prevented from being greatly reduced and the oil in the system is prevented from leaking. An electromagnetic pressure reducing valve capable of controlling output oil pressure according to input current is arranged at an outlet of an energy accumulator in the system, so that unnecessary release of oil liquid in the energy accumulator can be avoided, and further energy is saved.
The above-described embodiments are susceptible of numerous modifications and variations within the scope of the present invention and covered by the claims. Therefore, the described embodiments should not be construed as limiting the scope of the claims.
Claims (2)
1. An auxiliary energy accumulator type electro-hydraulic power steering system comprising: the hydraulic steering system comprises a steering wheel, a steering shaft, an integral circulating ball type power steering device, a first electromagnetic switch valve, an oil storage tank, a hydraulic pump, a pressure limiting valve, a one-way valve, an energy accumulator, a steering wheel torque angle sensor, an energy accumulator pressure sensor, an EHPS system controller, a motor controller, a power-assisted motor, an electromagnetic pressure reducing valve and a second electromagnetic switch valve, wherein the steering wheel is connected with the upper end of the steering shaft, the lower end of the steering shaft is connected with the input end of the circulating ball type power steering device, the steering wheel torque angle sensor is arranged in the middle of the steering shaft, the hydraulic pump is connected with a motor shaft of the power-assisted motor, the hydraulic pump is connected with an oil outlet of the oil storage tank through an oil inlet pipe, an oil inlet of the pressure limiting valve is connected with an oil outlet pipe of the hydraulic pump through an oil return pipe, an oil outlet of the pressure limiting valve is connected with an oil return port of the oil storage tank through an oil return pipe, and an oil return port of the oil return pipe of the integral circulating ball type power steering device is connected with an oil return pipe, the signal output line of steering wheel torque corner sensor is connected with the signal input port of EHPS system controller, and the network communication interface of EHPS system controller gathers speed of a motor vehicle signal with the on-vehicle network interface connection of vehicle, its characterized in that: the hydraulic pump is connected with an oil inlet of the one-way valve through an oil outlet pipe, an oil outlet of the one-way valve is connected with an oil inlet of the first electromagnetic switch valve through an oil pipe, an oil outlet of the first electromagnetic switch valve is connected with an oil inlet of the integral circulating ball type power steering gear through an oil pipe, an energy accumulator interface is connected with an oil inlet of the electromagnetic pressure reducing valve through an oil pipe, an oil outlet of the electromagnetic pressure reducing valve is connected to the oil pipe between the one-way valve and the first electromagnetic switch valve, an oil inlet of an energy accumulator pressure sensor is connected with the oil pipe between the energy accumulator and the electromagnetic pressure reducing valve, an oil inlet of a second electromagnetic switch valve is connected with an oil outlet pipeline of the electromagnetic pressure reducing valve through an oil pipe, an oil outlet of the second electromagnetic switch valve is connected with an oil inlet pipeline of the electromagnetic pressure reducing valve through an oil pipe, a signal output line of the energy accumulator pressure sensor is connected with a signal input port of the PS system controller, and an output port of the EHPS system controller is connected with the first electromagnetic switch valve, an output port of the EHPS system controller is connected with the electromagnetic pressure reducing valve, an output port of the EHPS system controller is connected with the second electromagnetic switch valve, and an output port of the EHPS system controller is connected with an input port of the motor controller.
2. An auxiliary energy accumulator electro-hydraulic power steering system according to claim 1, characterized in that: and an electromagnetic pressure reducing valve for controlling the output oil pressure according to the input current is arranged between the energy accumulator interface and the oil pipe for connecting the one-way valve and the first electromagnetic switch valve.
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| CN202023085919.5U CN213862399U (en) | 2020-12-18 | 2020-12-18 | Auxiliary energy accumulator type electric hydraulic power-assisted steering system |
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| CN202023085919.5U CN213862399U (en) | 2020-12-18 | 2020-12-18 | Auxiliary energy accumulator type electric hydraulic power-assisted steering system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114644039A (en) * | 2020-12-18 | 2022-06-21 | 南京林业大学 | Auxiliary energy accumulator type electric hydraulic power-assisted steering system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114644039A (en) * | 2020-12-18 | 2022-06-21 | 南京林业大学 | Auxiliary energy accumulator type electric hydraulic power-assisted steering system |
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