CN110979282B - Electro-hydraulic brake-by-wire device with redundancy function and control method - Google Patents
Electro-hydraulic brake-by-wire device with redundancy function and control method Download PDFInfo
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- CN110979282B CN110979282B CN201911364726.2A CN201911364726A CN110979282B CN 110979282 B CN110979282 B CN 110979282B CN 201911364726 A CN201911364726 A CN 201911364726A CN 110979282 B CN110979282 B CN 110979282B
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- 239000003921 oil Substances 0.000 claims description 112
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/145—Master cylinder integrated or hydraulically coupled with booster
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Abstract
The invention relates to an electro-hydraulic line control brake device with a redundancy function and a control method, wherein the electro-hydraulic line control brake device comprises a brake disc, calipers, a power take-off gear, a gear shaft, a lead screw, a return spring, a piston nut, a sealing ring, a high-pressure oil cylinder shell, an electromagnetic clutch, a fixed seat, a hydraulic control unit, a split liquid storage tank, an energy accumulator, a liquid storage tank, an angle sensor, a brake pedal, a brake push rod assembly, a brake master cylinder, a controller, a left friction plate and a right friction plate; the invention can fully utilize the kinetic energy of the vehicle as a power source, cancel the drive motor and effectively reduce the cost; a gear power take-off mechanism is adopted to drive a high-pressure oil cylinder to generate high-pressure brake oil, and whether the high-pressure oil cylinder works or not is controlled through an electromagnetic clutch; the high-pressure oil cylinder is integrated on the brake oil cylinder, so that the length of a brake pipeline is effectively shortened, the brake pressure fluctuation caused by elastic deformation of the brake pipeline is reduced, and the brake response speed and the control precision are improved; the method has the advantages of high integration level, high response speed and low cost.
Description
Technical Field
The invention relates to the field of automobile brakes, in particular to an electro-hydraulic brake-by-wire device with a redundancy function.
Background
The brake-by-wire technology is a novel brake technology appearing in recent years, a brake and a brake pedal do not depend on mechanical or hydraulic connection, a part of or all brake pipelines are replaced by electric wires, and an electric control element is operated by a controller to control the magnitude of braking force, so that the stable and reliable brake control of an automobile is realized. At present, the brake-by-wire system mainly comprises an electronic hydraulic brake system (EHB) and an electronic mechanical brake system (EMB). The brake-by-wire system is beneficial to optimizing the braking performance of the whole vehicle, and can be conveniently integrated with other electronic control systems such as ABS, ASR, ESP and the like, so that the system has wide development space.
An electronic mechanical brake system (EMB) drives a mechanical mechanism through a motor to realize a braking process, so that the structure of the brake system is greatly simplified, and the brake is easier to arrange, assemble and overhaul. However, the conventional electromechanical braking system often lacks a function of automatically adjusting the braking clearance at the brake part, so that the problem that the efficiency of a brake actuator is variable under the conditions of external environment change and friction plate abrasion of the brake is caused, and certain difficulty is brought to the control of the braking efficiency. Meanwhile, most of the electromechanical braking systems have the problems of complex structure, large installation size and the like. And the vehicle can completely lose the braking capability once the electronic element fails, so that the EMB is not widely applied to the loading at present and is only applied to a concept vehicle.
The electronic hydraulic brake system (EHB) is formed by transforming the traditional hydraulic brake system, the braking process is quicker and more stable, the braking safety and the comfort of an automobile are improved, but the electronic hydraulic brake system does not have all the advantages of a complete brake-by-wire system because a hydraulic component is reserved, and is generally regarded as an advanced product of an electronic mechanical brake system (EMB). Because the original hydraulic pipeline is reserved, even if the EHB system fails to brake, the vehicle still has certain brake capacity, and therefore the large-scale loading application is started.
Although an electronic brake pedal is used in the conventional electronic hydraulic brake system (EHB), the brake pressure is provided by a plunger pump driven by a motor, a high-pressure accumulator is used for storing the pressure, and a plurality of isolation electromagnetic valves are used in a standby brake system, so that the whole system has more parts and higher cost. In addition, in the existing brake system, the master cylinder and the pressure regulating unit are not integrated, the modularization degree is not high, the length of a brake pipeline is increased, and the brake pressure response is slow. The brake pipeline can generate elastic deformation under the action of high-pressure brake oil, so that the pressure fluctuation of the brake oil in the brake pipeline is caused, and the accurate control of the vehicle brake is greatly influenced.
In summary, the improvement of the braking performance of the electrohydraulic brake system (EHB) requires the following key problems to be solved: (1) the brake pressure is quickly built, the brake response time is shortened, and the quick pressure building is realized; (2) the effective action length of a high-pressure brake pipeline is shortened, the accuracy of controlling the braking of the vehicle is improved, and the accurate pressure control is realized.
Disclosure of Invention
Aiming at the defects of the existing brake-by-wire system, the invention provides an electro-hydraulic brake-by-wire device with a redundancy function, which can fully utilize the kinetic energy of a vehicle, adopts a power take-off mechanism to drive a high-pressure oil cylinder to generate high-pressure brake oil, integrates the high-pressure brake oil cylinder on a brake oil cylinder, effectively shortens the length of a brake pipeline, and has the advantages of high integration level, high response speed and low cost.
The invention is realized by the following technical measures:
an electro-hydraulic line control brake device with a redundancy function comprises a brake disc, calipers, a force taking gear, a gear shaft, a lead screw, a return spring, a piston nut, a sealing ring, a high-pressure oil cylinder shell, an electromagnetic clutch, a fixed seat, a hydraulic control unit, a split liquid storage tank, an energy accumulator, a liquid storage tank, an angle sensor, a brake pedal, a brake push rod assembly, a brake master cylinder, a controller, a left friction plate and a right friction plate; the end cap on the brake disc is fixedly arranged on a wheel through a bolt; the left friction plate and the right friction plate are respectively arranged in adaptive notches on the calipers, and the brake disc is arranged between the left friction plate and the right friction plate;
the periphery of the brake disc is provided with teeth, the power take-off gear is in gear meshing with the brake disc, the gear shaft is installed on a lifting lug support on the caliper through a bearing, the left end of the gear shaft is connected with the power take-off gear through a key, the right end of the gear shaft is connected with the input end of an electromagnetic clutch, a lead screw is connected with the output end of the electromagnetic clutch, and the electromagnetic clutch is fixedly installed on a flange plate of a high-pressure oil cylinder shell through a bolt;
one end of the high-pressure oil cylinder shell is provided with a guide limiting groove, the inner side of the return spring is fixedly arranged on the lead screw, the outer side of the return spring is clamped in the guide limiting groove of the high-pressure oil cylinder shell, and the return spring is used for returning the lead screw;
the lead screw is in threaded connection with the piston nut, and the limiting lifting lug on the piston nut is arranged in the guiding limiting groove of the high-pressure oil cylinder shell to limit the rotation of the high-pressure oil cylinder shell; the sealing ring is arranged in a notch of the piston nut and forms sealing with the high-pressure oil cylinder shell, the high-pressure oil cylinder shell is fixedly arranged on a brake oil cylinder on the caliper through a fixed seat, a brake piston is arranged in the brake oil cylinder, and one end of the brake piston is contacted with the right friction plate;
the brake master cylinder oil pipe interface at the right end of the brake oil cylinder and the high-pressure oil pipe interface at the right end of the high-pressure oil cylinder shell are respectively connected with a P5 port and a P1 port of the hydraulic control unit;
the hydraulic control unit comprises a first check valve, a second check valve, a third check valve, a first pressure sensor, a second pressure sensor, a first two-position two-way direction control valve, a second two-position two-way direction control valve, a third two-position two-way direction control valve, a P1 port, a P2 port, a P3 port, a P4 port, a P5 port and an internal flow passage, one end of the first check valve is connected with the P1 port, and the other end of the first check valve is connected with the P2 port and the first two-position two-way direction control valve; one end of the second check valve is connected with the port P1, and the other port of the second check valve is connected with the third check valve, the second two-position two-way direction control valve and the third two-position two-way direction control valve; the other port of the third one-way valve is connected with a port P3; the other ports of the first pressure sensor and the third two-position two-way directional control valve are both connected with a port P4; the second pressure sensor is connected with the port P5; the other ports of the first two-position two-way directional control valve and the second two-position two-way directional control valve are connected with a port P5; the second two-position two-way directional control valve is in a normally open state; the first two-position two-way directional control valve and the third two-position two-way directional control valve are in a normally closed state;
the split liquid storage tank is connected with a port P2 of the hydraulic control unit; the energy accumulator is connected with a port P4 of the hydraulic control unit; the brake master cylinder is connected with a port P3 of the hydraulic control unit;
the liquid storage tank is connected with the brake master cylinder; one end of the brake push rod assembly is arranged in the brake master cylinder, and the other end of the brake push rod assembly is hinged with the brake pedal; the top end of the brake pedal is hinged with the vehicle body, and an angle sensor is arranged at the hinged position;
the electromagnetic clutch, the angle sensor, the first pressure sensor, the second pressure sensor, the first two-position two-way direction control valve, the second two-position two-way direction control valve and the third two-position two-way direction control valve are all electrically connected with the controller.
The invention relates to a control method of an electro-hydraulic brake-by-wire device with a redundancy function, which adopts the technical scheme that:
when the vehicle is not braked, the first pressure sensor monitors the pressure of the energy storage device in real time and transmits a signal to the controller; if the pressure of the energy accumulator is too low, the controller controls the electromagnetic clutch to be closed according to a control strategy, the second two-position two-way directional control valve is switched to be in a normally closed state, the third two-position two-way directional control valve is switched to be in a normally open state, power is driven by the power take-off gear to drive the gear shaft to rotate, the screw rod is further driven to rotate, the screw rod pushes the piston nut to move rightwards, high-pressure oil enters a P1 port of the hydraulic control unit through a high-pressure oil pipe interface, the oil supplements pressure and fills liquid to the energy accumulator through the second one-way valve and the third two-position two-way directional control valve, and after supplement, all parts are restored to the initial state;
when the vehicle brakes, a driver steps on a brake pedal, an angle sensor transmits a signal to a controller, and the controller performs control according to a control strategy, wherein the control strategy comprises two processes of eliminating a brake clearance and quickly establishing brake pressure, and the two processes are performed simultaneously;
the working principle of eliminating the brake clearance is as follows: the controller controls the third two-position two-way directional control valve to be switched to a normally open state according to a control strategy, oil in the energy storage device quickly enters the brake oil cylinder through the third two-position two-way directional control valve, the second two-position two-way directional control valve and an oil pipe interface of the brake main cylinder, and then a brake piston in the brake oil cylinder is pushed to press a right friction plate to eliminate a brake gap, so that the response time is shortened; after the brake clearance is eliminated, the controller controls the third two-position two-way directional control valve to be switched to a normally closed state;
the working principle of quickly establishing the brake pressure is as follows: the controller controls the electromagnetic clutch to be closed according to a control strategy, power is driven by the power take-off gear to drive the gear shaft to rotate, so that the screw rod is driven to rotate, the screw rod pushes the piston nut to move rightwards, high-pressure oil enters a P1 port of the hydraulic control unit through a high-pressure oil pipe interface, the oil enters the brake oil cylinder through the second check valve, the second two-position two-way directional control valve and the oil pipe interface of the brake master cylinder, and then the brake piston in the brake oil cylinder is pushed to press the right friction plate to generate brake force, so that the vehicle is rapidly decelerated; the second pressure sensor collects signals in real time and transmits the signals to the controller, the controller controls according to a control strategy, if the brake pressure is too high, the controller reduces the control current of the electromagnetic clutch, further the oil supply pressure in the high-pressure oil cylinder shell is reduced, meanwhile, the controller controls the second two-position two-way directional control valve to be switched to a normally closed state, the first two-position two-way directional control valve to be switched to a normally open state, and brake oil flows back to the split liquid storage tank through the first two-position two-way directional control valve and a P2 port of the hydraulic control unit to be subjected to pressure relief; if the brake pressure is too low, the controller increases the control current of the electromagnetic clutch so as to increase the oil supply pressure in the high-pressure oil cylinder shell, and meanwhile, the controller controls the second two-position two-way directional control valve to be switched to a normally open state and the first two-position two-way directional control valve to be switched to a normally closed state so as to perform brake pressurization;
if the electromagnetic clutch or the hydraulic control unit fails, brake oil can still push the brake push rod assembly to generate brake pressure through the brake pedal, the oil flows out of the brake master cylinder and enters the brake oil cylinder through the third check valve, the second two-position two-way directional control valve, the P5 port of the hydraulic control unit and the oil pipe port of the brake master cylinder to generate brake force, and a redundant backup effect is achieved;
after braking is finished, the controller controls each element to reset, the return spring drives the screw rod to rotate reversely, the screw rod further drives the piston nut to move leftwards, and oil in the split liquid storage tank enters the high-pressure oil cylinder shell through the first check valve, the P1 port of the hydraulic control unit and the high-pressure oil pipe port.
The invention has the beneficial effects that:
an electro-hydraulic brake-by-wire device with a redundancy function can fully utilize the kinetic energy of a vehicle as a power source, and a driving motor adopted in the prior art is eliminated, so that the cost is effectively reduced; a gear power take-off mechanism is adopted to drive a high-pressure oil cylinder to generate high-pressure brake oil, and whether the high-pressure oil cylinder works or not is controlled through an electromagnetic clutch; the high-pressure oil cylinder is integrated on the brake oil cylinder, so that the length of a brake pipeline is effectively shortened, the brake pressure fluctuation caused by elastic deformation of the brake pipeline is reduced, and the brake response speed and the control precision are improved; the method has the advantages of high integration level, high response speed and low cost.
Compared with the prior art, the invention has the following beneficial effects:
1. the kinetic energy of the vehicle is fully utilized as a power source, a driving motor in the prior art is omitted, and the cost is effectively reduced; the high-pressure oil cylinder is driven by adopting a gear power take-off mechanism to generate high-pressure brake oil, the pressure build-up time of the high-pressure oil cylinder is closely related to the vehicle speed, and the higher the vehicle speed is, the shorter the pressure build-up time of the high-pressure oil cylinder is, so that the response speed is effectively improved;
2. the technical problem that the conventional hydraulic brake system relies on vacuum to assist brake boosting is effectively solved; meanwhile, the problem that the existing brake-by-wire system depends on a high-performance motor is solved; the problem of energy consumption caused by long-time work of accessories of the new energy vehicle such as a vacuum booster pump is effectively solved, and the driving range is increased;
3. the hydraulic brake pipeline is shortened, and the problem of brake lag caused by long brake pipeline of the conventional hydraulic brake system is solved; meanwhile, the problem of stress fluctuation caused by elastic deformation of a brake pipeline is reduced, and the response time and the control precision are effectively shortened;
4. and a brake-by-wire mode is adopted, so that system integration with ABS, EBD and the like is facilitated.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic view of the structure of the present invention.
Fig. 3 is a front view of the present invention.
FIG. 4 is a schematic view of a portion of the structure of the present invention.
Fig. 5 is a schematic structural diagram of a high-pressure oil cylinder shell of the invention.
FIG. 6 is a schematic view of a portion of the structure of the present invention.
FIG. 7 is a schematic view of a caliper according to the present invention.
Fig. 8 is a hydraulic control schematic of the present invention.
Fig. 9 is a schematic diagram of the control principle of the present invention.
In the figure, 1-brake disc, 2-caliper, 201-brake cylinder, 202-brake master cylinder oil pipe interface, 3-power take-off gear, 4-gear shaft, 5-lead screw, 6-return spring, 7-piston nut, 8-sealing ring, 9-high pressure oil cylinder shell, 901-high pressure oil pipe interface, 10-electromagnetic clutch, 11-fixing seat, 12-hydraulic control unit, 1201-first one-way valve, 1202-second one-way valve, 1203-third one-way valve, 1204-first pressure sensor, 1205-second pressure sensor, 1206-first two-position two-way direction control valve, 1207-second two-position two-way direction control valve, 1208-third two-position two-way direction control valve, 13-split liquid storage tank, 14-energy storage device, 15-a liquid storage tank, 16-an angle sensor, 17-a brake pedal, 18-a brake push rod assembly, 19-a brake master cylinder, 20-a controller, 21-a left friction plate and 22-a right friction plate.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by a specific embodiment in combination with the accompanying drawings.
An electro-hydraulic brake-by-wire device with a redundancy function is shown in fig. 1, fig. 2, fig. 3 and fig. 4, and comprises a brake disc 1, a caliper 2, a power take-off gear 3, a gear shaft 4, a lead screw 5, a return spring 6, a piston nut 7, a seal ring 8, a high-pressure oil cylinder shell 9, an electromagnetic clutch 10, a fixed seat 11, a hydraulic control unit 12, a split liquid storage tank 13, an energy accumulator 14, a liquid storage tank 15, an angle sensor 16, a brake pedal 17, a brake push rod assembly 18, a brake master cylinder 19, a controller 20, a left friction plate 21 and a right friction plate 22; the end cap on the brake disc 1 is fixedly arranged on a wheel through a bolt; the brake disc is characterized in that the caliper 2 is fixedly arranged on a vehicle body, the left friction disc 21 and the right friction disc 22 are respectively arranged in adaptive notches on the caliper 2, and the brake disc 1 is arranged between the left friction disc 21 and the right friction disc 22;
the periphery of the brake disc 1 is processed with teeth, the power take-off gear 3 is in gear meshing with the brake disc 1, the gear shaft 4 is installed on a lifting lug support on the caliper 2 through a bearing, the left end of the gear shaft 4 is connected with the power take-off gear 3 through a key, the right end of the gear shaft 4 is connected with the input end of an electromagnetic clutch 10, the lead screw 5 is connected with the output end of the electromagnetic clutch 10, and the electromagnetic clutch 10 is fixedly installed on a flange plate of a high-pressure oil cylinder shell 9 through bolts;
as shown in fig. 5, one end of the high-pressure cylinder housing 9 is provided with a guide limiting groove, as shown in fig. 3 and 6, the inner side of the return spring 6 is fixedly mounted on the lead screw 5, the outer side of the return spring 6 is clamped in the guide limiting groove of the high-pressure cylinder housing 9, and the return spring 6 is used for returning the lead screw 5;
the lead screw 5 is in threaded connection with the piston nut 7, and the limiting lifting lug on the piston nut 7 is arranged in a guiding limiting groove of the high-pressure oil cylinder shell 9 to limit the rotation of the high-pressure oil cylinder shell; as shown in fig. 4 and 6, the seal ring 8 is installed in the notch of the piston nut 7 and forms a seal with the high-pressure cylinder housing 9, as shown in fig. 3, the high-pressure cylinder housing 9 is fixedly installed on a brake cylinder 201 on the caliper 2 through a fixing seat 11, a brake piston is installed in the brake cylinder 201, and one end of the brake piston contacts with the right friction plate 22;
as shown in fig. 8, the brake master cylinder oil pipe interface 202 at the right end of the brake cylinder 201 and the high pressure oil pipe interface 901 at the right end of the high pressure cylinder housing 9 are respectively connected with a port P5 and a port P1 of the hydraulic control unit 12;
the hydraulic control unit 12 comprises a first check valve 1201, a second check valve 1202, a third check valve 1203, a first pressure sensor 1204, a second pressure sensor 1205, a first two-position two-way directional control valve 1206, a second two-position two-way directional control valve 1207, a third two-position two-way directional control valve 1208, a P1 port, a P2 port, a P3 port, a P4 port, a P5 port and an internal flow passage, wherein one end of the first check valve 1201 is connected with the P1 port, and the other end of the first check valve 1201 is connected with the P2 port and the first two-position two-way directional control valve 1206; one end of the second check valve 1202 is connected with a port P1, and the other port is connected with a third check valve 1203, a second two-position two-way directional control valve 1207 and a third two-position two-way directional control valve 1208; the other port of the third check valve 1203 is connected with a port P3; the other ports of the first pressure sensor 1204 and the third two-position two-way directional control valve 1208 are both connected with a port P4; the second pressure sensor 1205 is connected to port P5; the other ports of the first two-position two-way directional control valve 1206 and the second two-position two-way directional control valve 1207 are connected with a port P5; the second two-position two-way directional control valve 1207 is in a normally open state; the first two-position two-way directional control valve 1206 and the third two-position two-way directional control valve 1208 are in a normally closed state;
the split liquid storage tank 13 is connected with a port P2 of the hydraulic control unit 12; the accumulator 14 is connected with a port P4 of the hydraulic control unit 12; the master cylinder 19 is connected with a port P3 of the hydraulic control unit 12;
the liquid storage tank 15 is connected with a master cylinder 19; one end of the brake push rod assembly 18 is arranged in the brake master cylinder 19, and the other end is hinged with the brake pedal 17; the top end of the brake pedal 17 is hinged with the vehicle body, and an angle sensor 16 is arranged at the hinged position;
the electromagnetic clutch 10, the angle sensor 16, the first pressure sensor 1204, the second pressure sensor 1205, the first two-position two-way directional control valve 1206, the second two-position two-way directional control valve 1207 and the third two-position two-way directional control valve 1208 are all electrically connected with the controller 20.
The following describes a control method of an electro-hydraulic brake-by-wire device with a redundancy function according to the present invention with reference to the accompanying drawings.
When the vehicle is not braked, the first pressure sensor 1204 monitors the pressure of the energy storage device 14 in real time and transmits a signal to the controller 20; if the pressure of the energy accumulator 14 is too low, the controller 20 controls the electromagnetic clutch 10 to be closed according to a control strategy, the second two-position two-way directional control valve 1207 is switched to a normally closed state, the third two-position two-way directional control valve 1208 is switched to a normally open state, power is used for driving the gear shaft 4 to rotate by the power take-off gear 3, the screw 5 is further driven to rotate, the screw 5 pushes the piston nut 7 to move rightwards, high-pressure oil enters a P1 port of the hydraulic control unit 12 through a high-pressure oil pipe interface 901, the oil supplements pressure and fills liquid for the energy accumulator 14 through the second one-way valve 1202 and the third two-position two-way directional control valve 1208, and after the supplement is completed, all the components are restored to the initial state;
when the vehicle brakes, a driver steps on a brake pedal 17, the angle sensor 16 transmits a signal to the controller 20, and the controller 20 performs control according to a control strategy, wherein the control strategy comprises two processes of eliminating a brake gap and quickly establishing brake pressure, and the two processes are performed simultaneously;
the working principle of eliminating the brake clearance is as follows: the controller 20 controls the third two-position two-way directional control valve 1208 to be switched to a normally open state according to a control strategy, oil in the energy storage 14 rapidly enters the brake cylinder 201 through the third two-position two-way directional control valve 1208, the second two-position two-way directional control valve 1207 and the oil pipe interface 202 of the brake master cylinder, and then the brake piston in the brake cylinder 201 is pushed to press the right friction plate 22 to eliminate a brake gap, so that the response time is shortened; after the braking gap is eliminated, the controller 20 controls the third two-position, two-way directional control valve 1208 to switch to the normally closed state;
the working principle of quickly establishing the brake pressure is as follows: the controller 20 controls the electromagnetic clutch 10 to be closed according to a control strategy, power is driven by the power take-off gear 3 to drive the gear shaft 4 to rotate, so that the screw 5 is driven to rotate, the screw 5 pushes the piston nut 7 to move right, high-pressure oil enters a P1 port of the hydraulic control unit 12 through a high-pressure oil pipe interface 901, the oil enters the brake cylinder 201 through the second check valve 1202, the second two-position two-way directional control valve 1207 and the brake master cylinder oil pipe interface 202, so that a brake piston in the brake cylinder 201 is pushed to press the right friction plate 22 to generate brake force, and the vehicle is rapidly decelerated; the second pressure sensor 1205 collects signals in real time and transmits the signals to the controller 20, the controller 20 controls according to a control strategy, if the brake pressure is too high, the controller 20 reduces the control current of the electromagnetic clutch 10, so that the oil supply pressure in the high-pressure oil cylinder shell 9 is reduced, meanwhile, the controller 20 controls the second two-position two-way directional control valve 1207 to be switched to a normally closed state, the first two-position two-way directional control valve 1206 is switched to a normally open state, and brake oil flows back to the split liquid storage tank 13 through the first two-position two-way directional control valve 1206 and a P2 port of the hydraulic control unit 12 to be released;
if the brake pressure is too low, the controller 20 increases the control current of the electromagnetic clutch 10, so as to increase the oil supply pressure in the high-pressure oil cylinder shell 9, and meanwhile, the controller 20 controls the second two-position two-way directional control valve 1207 to be switched to a normally open state, and the first two-position two-way directional control valve 1206 to be switched to a normally closed state, so that the brake pressure is increased;
if the electromagnetic clutch 10 or the hydraulic control unit 12 fails, the brake oil can still push the brake push rod assembly 18 to generate brake pressure by the brake pedal 17, the oil flows out of the brake master cylinder 19 and enters the brake oil cylinder 201 through the third check valve 1203, the second two-position two-way directional control valve 1207, the port P5 of the hydraulic control unit 12 and the oil pipe interface 202 of the brake master cylinder to generate brake force, and a redundant backup effect is achieved;
after braking is finished, the controller 20 controls each element to reset, the return spring 6 drives the screw rod 5 to rotate reversely, the screw rod 5 further drives the piston nut 7 to move left, and oil in the split liquid storage tank 13 enters the high-pressure oil cylinder shell 9 through the first check valve 1201, the port P1 of the hydraulic control unit 12 and the high-pressure oil pipe port 901.
Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (2)
1. An electro-hydraulic line control brake device with a redundancy function comprises a brake disc (1), calipers (2), a power take-off gear (3), a gear shaft (4), a lead screw (5), a return spring (6), a piston nut (7), a sealing ring (8), a high-pressure oil cylinder shell (9), an electromagnetic clutch (10), a fixed seat (11), a hydraulic control unit (12), a split liquid storage tank (13), an energy accumulator (14), a liquid storage tank (15), an angle sensor (16), a brake pedal (17), a brake push rod assembly (18), a brake master cylinder (19), a controller (20), a left friction plate (21) and a right friction plate (22); the method is characterized in that: the end cap on the brake disc (1) is fixedly arranged on a wheel through a bolt; the brake disc brake is characterized in that the caliper (2) is fixedly arranged on a vehicle body, the left friction disc (21) and the right friction disc (22) are respectively arranged in adaptive notches on the caliper (2), and the brake disc (1) is arranged between the left friction disc (21) and the right friction disc (22);
the method is characterized in that: the periphery of the brake disc (1) is machined with teeth, the power take-off gear (3) is in gear meshing with the brake disc (1), the gear shaft (4) is installed on a lifting lug support on the caliper (2) through a bearing, the left end of the gear shaft (4) is in key connection with the power take-off gear (3), the right end of the gear shaft (4) is connected with the input end of an electromagnetic clutch (10), the lead screw (5) is connected with the output end of the electromagnetic clutch (10), and the electromagnetic clutch (10) is fixedly installed on a flange plate of a high-pressure oil cylinder shell (9) through bolts;
one end of the high-pressure oil cylinder shell (9) is provided with a guide limiting groove, the inner side of the return spring (6) is fixedly arranged on the lead screw (5), the outer side of the return spring (6) is clamped in the guide limiting groove of the high-pressure oil cylinder shell (9), and the return spring (6) is used for returning the lead screw (5);
the lead screw (5) is in threaded connection with the piston nut (7), and a limiting lifting lug on the piston nut (7) is arranged in a guiding limiting groove of the high-pressure oil cylinder shell (9) to limit the rotation of the high-pressure oil cylinder shell; the sealing ring (8) is arranged in a notch of the piston nut (7) and forms a seal with the high-pressure oil cylinder shell (9), the high-pressure oil cylinder shell (9) is fixedly arranged on a brake oil cylinder (201) on the caliper (2) through a fixing seat (11), a brake piston is arranged in the brake oil cylinder (201), and one end of the brake piston is contacted with the right friction plate (22);
the brake master cylinder oil pipe interface (202) at the right end of the brake oil cylinder (201) and the high-pressure oil pipe interface (901) at the right end of the high-pressure oil cylinder shell (9) are respectively connected with a P5 port and a P1 port of the hydraulic control unit (12);
the hydraulic control unit (12) comprises a first check valve (1201), a second check valve (1202), a third check valve (1203), a first pressure sensor (1204), a second pressure sensor (1205), a first two-position two-way direction control valve (1206), a second two-position two-way direction control valve (1207), a third two-position two-way direction control valve (1208), a P1 port, a P2 port, a P3 port, a P4 port, a P5 port and an internal flow passage, one end of the first check valve (1201) is connected with the P1 port, and the other end of the first check valve is connected with the P2 port and the first two-position two-way direction control valve (1206); one end of the second check valve (1202) is connected with a port P1, and the other port is connected with a third check valve (1203), a second two-position two-way directional control valve (1207) and a third two-position two-way directional control valve (1208); the other port of the third check valve (1203) is connected with a port P3; the other ports of the first pressure sensor (1204) and the third two-position two-way directional control valve (1208) are connected with a port P4; a second pressure sensor (1205) is connected with the port P5; the other ports of the first two-position two-way directional control valve (1206) and the second two-position two-way directional control valve (1207) are connected with a port P5; the second two-position two-way directional control valve (1207) is in a normally open state; the first two-position two-way directional control valve (1206) and the third two-position two-way directional control valve (1208) are in a normally closed state;
the split liquid storage tank (13) is connected with a port P2 of the hydraulic control unit (12); the accumulator (14) is connected with a port P4 of the hydraulic control unit (12); the brake master cylinder (19) is connected with a port P3 of the hydraulic control unit (12);
the liquid storage tank (15) is connected with a brake master cylinder (19); one end of the brake push rod assembly (18) is arranged in the brake master cylinder (19), and the other end of the brake push rod assembly is hinged with the brake pedal (17); the top end of the brake pedal (17) is hinged with the vehicle body, and an angle sensor (16) is arranged at the hinged position;
the electromagnetic clutch (10), the angle sensor (16), the first pressure sensor (1204), the second pressure sensor (1205), the first two-position two-way directional control valve (1206), the second two-position two-way directional control valve (1207) and the third two-position two-way directional control valve (1208) are all electrically connected with the controller (20).
2. A control method for an electro-hydraulic brake-by-wire apparatus having a redundant function according to claim 1, characterized in that:
when the vehicle is not braked, the first pressure sensor (1204) monitors the pressure of the energy storage device (14) in real time and transmits a signal to the controller (20); if the pressure of the energy accumulator (14) is too low, the controller (20) controls the electromagnetic clutch (10) to be closed according to a control strategy, the second two-position two-way directional control valve (1207) is switched to a normally closed state, the third two-position two-way directional control valve (1208) is switched to a normally open state, power is driven by the power take-off gear (3) to drive the gear shaft (4) to rotate, the screw (5) is further driven to rotate, the screw (5) pushes the piston nut (7) to move rightwards, high-pressure oil enters a P1 port of the hydraulic control unit (12) through the high-pressure oil pipe interface (901), the oil supplements and fills the energy accumulator (14) through the second one-way valve (1202) and the third two-position two-way directional control valve (1208), and after supplement is finished, all the components are restored to the initial state;
when a vehicle brakes, a driver steps on a brake pedal (17), an angle sensor (16) transmits a signal to a controller (20), and the controller (20) controls according to a control strategy, wherein the two processes comprise a brake clearance elimination process and a brake pressure quick establishment process, and are sequentially carried out;
the working principle of eliminating the brake clearance is as follows: the controller (20) controls the third two-position two-way directional control valve (1208) to be switched to a normally open state according to a control strategy, oil in the energy storage device (14) quickly enters the brake cylinder (201) through the third two-position two-way directional control valve (1208), the second two-position two-way directional control valve (1207) and the brake master cylinder oil pipe interface (202), and then a brake piston in the brake cylinder (201) is pushed to press a right friction plate (22) to eliminate a brake gap, and response time is shortened; after the brake clearance is eliminated, the controller (20) controls the third two-position two-way directional control valve (1208) to be switched to a normally closed state;
the working principle of quickly establishing the brake pressure is as follows: the controller (20) controls the electromagnetic clutch (10) to be closed according to a control strategy, power is driven by the power take-off gear (3) to drive the gear shaft (4) to rotate, the lead screw (5) is driven to rotate, the lead screw (5) pushes the piston nut (7) to move right, high-pressure oil enters a P1 port of the hydraulic control unit (12) through a high-pressure oil pipe interface (901), and the oil enters the brake cylinder (201) through a second check valve (1202), a second two-position two-way directional control valve (1207) and a brake master cylinder oil pipe interface (202), so that a brake piston in the brake cylinder (201) is pushed to press a right friction plate (22) to generate brake force, and the vehicle is rapidly decelerated; the second pressure sensor (1205) collects signals in real time and transmits the signals to the controller (20), the controller (20) controls according to a control strategy, if the brake pressure is too high, the controller (20) reduces the control current of the electromagnetic clutch (10), so that the oil supply pressure in the high-pressure oil cylinder shell (9) is reduced, meanwhile, the controller (20) controls the second two-position two-way directional control valve (1207) to be switched to a normally closed state, the first two-position two-way directional control valve (1206) to be switched to a normally open state, and the brake oil flows back to the split liquid storage tank (13) through the first two-position two-way directional control valve (1206) and a P2 port of the hydraulic control unit (12) to be released; if the braking pressure is too low, the controller (20) increases the control current of the electromagnetic clutch (10) so as to increase the oil supply pressure in the high-pressure oil cylinder shell (9), and meanwhile, the controller (20) controls the second two-position two-way directional control valve (1207) to be switched to a normally open state and the first two-position two-way directional control valve (1206) to be switched to a normally closed state so as to perform braking pressurization;
if the electromagnetic clutch (10) or the hydraulic control unit (12) fails, brake oil can still push a brake push rod assembly (18) to generate brake pressure through a brake pedal (17), the oil flows out of a brake master cylinder (19), and enters a brake oil cylinder (201) through a third check valve (1203), a second two-position two-way directional control valve (1207), a P5 port of the hydraulic control unit (12) and a brake master cylinder oil pipe interface (202) to generate brake force, so that a redundant backup effect is achieved;
after braking is finished, the controller (20) controls each element to reset, the return spring (6) drives the screw rod (5) to rotate reversely, the screw rod (5) further drives the piston nut (7) to move left, and oil in the split liquid storage tank (13) enters the high-pressure oil cylinder shell (9) through the first check valve (1201), a port P1 of the hydraulic control unit (12) and the high-pressure oil pipe connector (901).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911364726.2A CN110979282B (en) | 2019-12-26 | 2019-12-26 | Electro-hydraulic brake-by-wire device with redundancy function and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911364726.2A CN110979282B (en) | 2019-12-26 | 2019-12-26 | Electro-hydraulic brake-by-wire device with redundancy function and control method |
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| CN110979282A CN110979282A (en) | 2020-04-10 |
| CN110979282B true CN110979282B (en) | 2021-10-19 |
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| CN201911364726.2A Expired - Fee Related CN110979282B (en) | 2019-12-26 | 2019-12-26 | Electro-hydraulic brake-by-wire device with redundancy function and control method |
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| CN113002505B (en) * | 2021-03-18 | 2022-02-01 | 湖南机电职业技术学院 | Intelligent automobile drive-by-wire brake device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3983975A (en) * | 1974-05-08 | 1976-10-05 | Girling Limited | Lock assembly for a vehicle disc brake |
| GB2326205A (en) * | 1997-03-18 | 1998-12-16 | Reginald John Henry Strong | A trailer overrun braking system |
| CN101913348A (en) * | 2010-08-13 | 2010-12-15 | 清华大学 | Wheel rim driving wheel brake device |
| CN202225863U (en) * | 2011-08-26 | 2012-05-23 | 山东交通学院 | Power take-off type electronic brake |
| CN202294752U (en) * | 2011-09-22 | 2012-07-04 | 山东交通学院 | Wire-controlled electric hydraulic brake |
| KR20170124743A (en) * | 2016-05-03 | 2017-11-13 | 현대자동차주식회사 | Electro-Mechanical Brake |
| CN109780089A (en) * | 2017-11-10 | 2019-05-21 | 湖南三占科技股份有限公司 | A kind of hydraulic rim brake |
-
2019
- 2019-12-26 CN CN201911364726.2A patent/CN110979282B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3983975A (en) * | 1974-05-08 | 1976-10-05 | Girling Limited | Lock assembly for a vehicle disc brake |
| GB2326205A (en) * | 1997-03-18 | 1998-12-16 | Reginald John Henry Strong | A trailer overrun braking system |
| CN101913348A (en) * | 2010-08-13 | 2010-12-15 | 清华大学 | Wheel rim driving wheel brake device |
| CN202225863U (en) * | 2011-08-26 | 2012-05-23 | 山东交通学院 | Power take-off type electronic brake |
| CN202294752U (en) * | 2011-09-22 | 2012-07-04 | 山东交通学院 | Wire-controlled electric hydraulic brake |
| KR20170124743A (en) * | 2016-05-03 | 2017-11-13 | 현대자동차주식회사 | Electro-Mechanical Brake |
| CN109780089A (en) * | 2017-11-10 | 2019-05-21 | 湖南三占科技股份有限公司 | A kind of hydraulic rim brake |
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| CN110979282A (en) | 2020-04-10 |
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