CN111332266A - Electric control brake hydraulic system and engineering machinery - Google Patents
Electric control brake hydraulic system and engineering machinery Download PDFInfo
- Publication number
- CN111332266A CN111332266A CN202010241324.XA CN202010241324A CN111332266A CN 111332266 A CN111332266 A CN 111332266A CN 202010241324 A CN202010241324 A CN 202010241324A CN 111332266 A CN111332266 A CN 111332266A
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- Prior art keywords
- accumulator
- brake
- pressure
- valve
- energy accumulator
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Classifications
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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
- B60T13/16—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 pumps directly, i.e. without interposition of accumulators or reservoirs
- B60T13/18—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 pumps directly, i.e. without interposition of accumulators or reservoirs with control of pump output delivery, e.g. by distributor valves
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
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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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses an electrically controlled brake hydraulic system, which comprises a gear pump and an electric proportional charging valve connected with an oil outlet of the gear pump, wherein the electric proportional charging valve is connected with a brake system through a safe energy storage valve; the braking system comprises a first energy accumulator, a first pressure sensor and a first braking bridge which are positioned on a first braking oil path, and a second energy accumulator, a second pressure sensor and a second braking bridge which are positioned on a second braking oil path, wherein braking valves used for controlling the first braking bridge and the second braking bridge to move are arranged on the first braking oil path and the second braking oil path, and the first pressure sensor and the second pressure sensor respectively detect pressure values of the first energy accumulator and the second energy accumulator. The engineering machinery comprises the brake hydraulic system. The invention receives the signal of the sensor through the electric proportional liquid charging valve, realizes accurate liquid charging, reduces the load of the gear pump, and simultaneously solves the problems that when one energy accumulator fails, the safe energy accumulation valve shields the energy accumulator, ensures the pressure of the other energy accumulator to be maintained, provides the braking pressure for a braking system and ensures the braking reliability of the whole machine.
Description
Technical Field
The invention relates to a hydraulic system, in particular to a brake hydraulic system of a loader electric control liquid charging and safety energy storage device, and belongs to the technical field of engineering machinery.
Background
In the prior art, most of braking systems of engineering vehicles such as loaders and the like are in a pneumatic oil jacking mode and a full hydraulic braking mode, and brake discs in the pneumatic oil jacking mode are easy to heat and poor in pollution resistance; the full hydraulic brake system has good anti-pollution performance, a liquid filling valve is required to continuously fill liquid into the brake system, and the system is complex and has high cost. And the existing brake system can not realize accurate liquid filling. And if the energy accumulator is damaged, the brake pressure can not be provided for the brake system, so that the potential safety hazard is generated. Therefore, it is necessary to design a brake system and a construction machine which have simple structure, low cost and can ensure braking.
Disclosure of Invention
The invention aims to overcome the defect that the brake pressure cannot be provided for a brake system after an energy accumulator is damaged in the prior art, and provides an electrically controlled brake hydraulic system, which has the following technical scheme:
the electric control brake hydraulic system comprises a gear pump and an electric proportional charging valve connected with an oil outlet of the gear pump, wherein the electric proportional charging valve is connected with a brake system through a safe energy storage valve;
the brake system comprises a first accumulator, a first pressure sensor and a first brake bridge which are positioned on a first brake oil path, a second accumulator, a second pressure sensor and a second brake bridge which are positioned on a second brake oil path,
brake valves for controlling the first brake axle and the second brake axle to move are arranged on the first brake oil way and the second brake oil way;
the first pressure sensor and the second pressure sensor respectively detect the pressure values of the first energy accumulator and the second energy accumulator,
when braking, the brake valve is in the lower position, if the first energy accumulator is damaged, the pressure of the first energy accumulator is rapidly reduced, the safety energy accumulation valve is switched to the left position under the pressure of the second energy accumulator, and the gear pump only charges and maintains the pressure of the second energy accumulator;
when braking, the brake valve is in the lower position, if the second energy accumulator is damaged, the pressure of the second energy accumulator is rapidly reduced, the safety energy accumulation valve is switched to the right position under the pressure of the first energy accumulator, and the gear pump only charges and maintains the pressure of the first energy accumulator.
Engineering machinery comprises the electric control brake hydraulic system.
Compared with the prior art, the invention has the following beneficial effects:
the electric proportional liquid charging valve receives a sensor signal, so that accurate liquid charging is realized, the load of the gear pump is reduced, and meanwhile, when one energy accumulator fails, the safety energy storage valve shields the energy accumulator, the pressure of the other energy accumulator is kept, the braking pressure is provided for a braking system, and the braking reliability of the whole machine is ensured.
Drawings
FIG. 1 is a hydraulic diagram of the braking system of the present invention;
FIG. 2 is a block diagram of a safety accumulator valve in the braking system of the present invention;
in the figure: 1-oil tank, 2-gear pump, 3-overflow valve, 4-electric proportional charging valve, 5-safe energy storage valve, 501-valve body, 502-valve core, 503-spring, 504-spring seat, 6-first energy accumulator, 7-first pressure sensor, 8-second pressure sensor, 9-second energy accumulator, 10-brake valve, 11-first brake bridge, 12-second brake bridge and 13-one-way valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The electric control brake hydraulic system comprises a gear pump 2 and an electric proportional charging valve 4 connected with an oil outlet of the gear pump 2, wherein the electric proportional charging valve 4 is connected with a brake system through a safety energy storage valve 5;
the brake system comprises a first accumulator 6, a first pressure sensor 7 and a first brake bridge 11 which are positioned on a first brake oil path, a second accumulator 9, a second pressure sensor 8 and a second brake bridge 12 which are positioned on a second brake oil path,
a brake valve 10 for controlling the movement of a first brake axle 11 and a second brake axle 12 is arranged on the first brake oil path and the second brake oil path;
the first pressure sensor 7 and the second pressure sensor 8 respectively detect the pressure values of the first accumulator 6 and the second accumulator 9,
when braking, the brake valve 10 is in the lower position, if the first energy accumulator 6 is damaged, the pressure of the first energy accumulator 6 is rapidly reduced, the safety energy accumulator valve 5 is switched to the left position under the pressure of the second energy accumulator 9, the pressure of the second energy accumulator 9 is maintained, the gear pump 2 only fills and maintains the pressure of the second energy accumulator 9, and power is provided for a whole vehicle brake system;
when braking, the brake valve 10 is in the lower position, if the second energy accumulator 9 is damaged, the pressure of the second energy accumulator 9 is rapidly reduced, the safety energy accumulator valve 5 is switched to the right position by the pressure of the first energy accumulator 6, the pressure of the first energy accumulator 6 is maintained, the gear pump 2 only fills and maintains the pressure of the first energy accumulator 6, and power is provided for a whole vehicle brake system.
In the embodiment, specifically, when the pressures of the first accumulator 6 and the second accumulator 9 are lower than the set lower limit value, the first pressure sensor 7 and the second pressure sensor 8 feed back signals to the electro-proportional charging valve 4, the electro-proportional charging valve 4 is located at the left position, and the gear pump 2 supplies oil to the first accumulator 6 and the second accumulator 9;
when the pressure of the first energy accumulator 6 and the second energy accumulator 9 is higher than the set upper limit value, the first pressure sensor 7 and the second pressure sensor 8 feed back signals to the electro-proportional charging valve 4, the electro-proportional charging valve 4 is located at the right position, the gear pump 2 stops supplying oil to the first energy accumulator 6 and the second energy accumulator 9, and the gear pump 2 supplies oil to other systems.
In the embodiment, a check valve 13 is arranged between the oil outlet E of the electric proportional liquid charging valve 4 and the oil inlet P of the safety energy storage valve 5. The electric proportional charging valve 4 is provided with an oil inlet P, an oil outlet E and a bypass port C, and the oil inlet P of the electric proportional charging valve 4 is connected with the gear pump 2. An oil outlet E of the electric proportional liquid charging valve 4 is connected with a one-way valve 13, the one-way valve 13 is connected with an inlet P of the safety energy storage valve 5, a first outlet A of the safety energy storage valve 5 is connected with the first energy accumulator 6, and a second outlet B of the safety energy storage valve 5 is connected with the second energy accumulator 9; the first accumulator 6 is connected with one working port P above the brake valve 10, and the second accumulator 9 is connected with the other working port P below the brake valve 10; an oil return port T of the brake valve 10 is connected with the oil return tank 1, and two working ports A are respectively connected with a first brake bridge 11 and a second brake bridge 12.
In the embodiment, specifically, the oil outlet of the gear pump 2 is also provided with a relief valve 3.
In the embodiment, the bypass port C of the electric proportional charging valve 4 is connected with other systems. The electric proportional charging valve 4 receives signals from a controller, the signals of the controller are electric signals from a first pressure sensor 7 and a second pressure sensor 8, and a bypass port C of the electric proportional charging valve 4 is connected to other systems; the left position of the working position of the electric proportional charging valve 4 is provided with a throttling orifice which is matched with the gear pump 2, so that the highest pressure required by the first energy accumulator 6 and the second energy accumulator 9 can be established.
In the present embodiment, in particular, the safety energy storage valve 5 has an inlet P and a first outlet a, which is connected to the first accumulator 6, and a second outlet B, which is connected to the second accumulator 9. The first outlet a feeds back a signal to the left end of the spool 502, and the second outlet B feeds back a signal to the right end of the spool 502. After the valve core 502 is shifted, the gear pump can be ensured to charge the accumulator and provide the flow required by the brake system. As shown in fig. 2, the safety energy storage valve 5 comprises a valve body 501, a valve core 502, a spring 503 and a spring seat 504, wherein the valve core 502 is installed in the valve body 501 and is positioned at a middle position under the action of the springs 503 at two ends, a throttling groove is formed in the valve core 502, the throttling groove is a U-shaped or V-shaped groove, the throttling groove and the valve body 501 form a damping effect, and the valve core 502 is reversed by establishing a pressure difference through damping. The first outlet a communicates with the left spring chamber through the passageway of the valve body 501 and the second outlet B communicates with the right spring chamber through the passageway of the valve body 501.
Through calculation and analysis, the design of the throttling groove meets the following condition that the first energy accumulator 6 suddenly fails, the second energy accumulator 9 flows to the first energy accumulator 6 through the throttling groove, the throttling groove generates pressure difference at the moment, the valve core 502 is rapidly closed, the second energy accumulator 9 maintains pressure, and braking pressure is provided.
Engineering machinery comprises the electric control brake hydraulic system.
The gear pump 2 provides brake oil for the brake system, and the gear pump 2 is used for supplying oil for the first brake bridge 11 and the second brake bridge 12. The electric proportional charging valve 4 charges the brake system, the safety energy storage valve 5 distributes high-pressure hydraulic oil for the two energy accumulators (namely the first energy accumulator 6 and the second energy accumulator 9), and the brake valve 10 provides brake pressure for brake cavities of the front axle and the rear axle (namely the first brake axle 11 and the second brake axle 12) for braking control of the whole vehicle.
When the machine is started, the pressure sensor collects the pressure of the energy accumulator and the pressure is lower than the pressure set by a program, the pressure sensor feeds back a signal to the electric proportional charging valve 4, the electric proportional brake valve 10 is electrified, the electric proportional charging valve 4 supplies oil to the energy accumulator, and the gear pump 2 charges the brake system; when the accumulator pressure is higher than the programmed pressure (when the upper limit of the controller program is reached), the electric proportional brake valve 10 is de-energized by the transmission signal, the electric proportional charging valve 4 is charged, and the gear pump 2 supplies oil to other systems.
If the first energy accumulator 6 suddenly fails, the first brake oil path where the first energy accumulator 6 is located cannot provide brake pressure, and oil of the second energy accumulator 9 can be released, after the safety energy accumulation valve 5 is arranged, when the first energy accumulator 6 suddenly fails, the pressure of the first brake oil path rapidly becomes low, the pressure of the second energy accumulator 9 can act to change the direction of the valve core 502, the loop of the first energy accumulator 6 is cut off, the second energy accumulator 9 can be guaranteed to maintain pressure, flow required by a brake system can be normally provided, and safety of the whole machine is guaranteed.
One path of the electric control liquid charging valve in the embodiment supplies oil to the energy accumulator, the other path supplies oil to other systems, when the pressure of the energy accumulator is lower than the pressure set by a program, the pressure sensor feeds back a signal to the electric proportional liquid charging valve 4, so that the electric proportional liquid charging valve 4 supplies oil to the energy accumulator, when the pressure of the energy accumulator is higher than the pressure set by the program, the electric proportional liquid charging valve 4 finishes liquid charging, and the gear pump 2 supplies oil to other systems; the safety energy storage valve 5 can supply oil to the two energy accumulators simultaneously, and meanwhile, when any one energy accumulator fails, the safety energy storage valve 5 cuts off the energy accumulator which normally works, so that the energy accumulator which normally works can maintain pressure, the normal function of changing the road and braking is ensured, and the safety of a vehicle is ensured.
The invention receives the signal of the sensor through the electric proportional liquid charging valve, realizes accurate liquid charging, reduces the load of the gear pump, and simultaneously solves the problems that when one energy accumulator fails, the safe energy accumulation valve shields the energy accumulator, ensures the pressure of the other energy accumulator to be maintained, provides the braking pressure for a braking system and ensures the braking reliability of the whole machine.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The electric control brake hydraulic system is characterized by comprising a gear pump and an electric proportional charging valve connected with an oil outlet of the gear pump, wherein the electric proportional charging valve is connected with a brake system through a safety energy storage valve;
the brake system comprises a first accumulator, a first pressure sensor and a first brake bridge which are positioned on a first brake oil path, a second accumulator, a second pressure sensor and a second brake bridge which are positioned on a second brake oil path,
brake valves used for controlling the first brake axle and the second brake axle to move are arranged on the first brake oil way and the second brake oil way;
the first pressure sensor and the second pressure sensor respectively detect the pressure values of the first accumulator and the second accumulator,
when braking, the brake valve is in a lower position, if the first accumulator is damaged, the pressure of the first accumulator is rapidly reduced, the safety accumulator valve is switched to a left position under the action of the pressure of the second accumulator, and the gear pump only charges and maintains the pressure of the second accumulator;
when braking, the brake valve is in the lower position, if the second energy accumulator is damaged, the pressure of the second energy accumulator is rapidly reduced, the safety energy accumulation valve is switched to the right position by the pressure of the first energy accumulator, the pressure of the first energy accumulator is maintained, and the gear pump only maintains the pressure of the first energy accumulator.
2. An electrically controlled brake hydraulic system according to claim 1,
when the pressure of the first energy accumulator and the pressure of the second energy accumulator are lower than a set lower limit value, the first pressure sensor and the second pressure sensor feed back signals to the electric proportional charging valve, the electric proportional charging valve is located at a left position, and the gear pump supplies oil to the first energy accumulator and the second energy accumulator;
when the pressure of the first energy accumulator and the pressure of the second energy accumulator are higher than the set upper limit value, the first pressure sensor and the second pressure sensor feed back signals to the electric proportional liquid charging valve, the electric proportional liquid charging valve is located at the right position, the gear pump stops supplying oil to the first energy accumulator and the second energy accumulator, and the gear pump supplies oil to other systems.
3. An electrically controlled brake hydraulic system according to claim 1, characterized in that a one-way valve is provided between the oil outlet of the electro-proportional charging valve and the oil inlet of the safety accumulator valve.
4. An electro-hydraulic control system according to claim 1, characterized in that the gear pump oil outlet is further provided with a relief valve.
5. An electro-controlled brake hydraulic system according to claim 1, characterized in that the bypass port of the electro-proportional charging valve is connected to other systems.
6. An electro-controlled brake hydraulic system according to claim 1, characterized in that the safety accumulator valve has an inlet P and a first outlet a, which is connected to the first accumulator, and a second outlet B, which is connected to a second accumulator.
7. A working machine, characterized by comprising an electrically controlled brake hydraulic system according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241324.XA CN111332266A (en) | 2020-03-31 | 2020-03-31 | Electric control brake hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241324.XA CN111332266A (en) | 2020-03-31 | 2020-03-31 | Electric control brake hydraulic system and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN111332266A true CN111332266A (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010241324.XA Pending CN111332266A (en) | 2020-03-31 | 2020-03-31 | Electric control brake hydraulic system and engineering machinery |
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| Country | Link |
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| CN (1) | CN111332266A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183486A (en) * | 2020-09-15 | 2022-03-15 | 中联农业机械股份有限公司 | Liquid filling valve group, brake control system and agricultural machine with liquid filling valve group and brake control system |
| CN115352423A (en) * | 2022-08-19 | 2022-11-18 | 东风越野车有限公司 | Electronic hydraulic braking system energy accumulator pressure control and fault detection system and method |
-
2020
- 2020-03-31 CN CN202010241324.XA patent/CN111332266A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183486A (en) * | 2020-09-15 | 2022-03-15 | 中联农业机械股份有限公司 | Liquid filling valve group, brake control system and agricultural machine with liquid filling valve group and brake control system |
| CN115352423A (en) * | 2022-08-19 | 2022-11-18 | 东风越野车有限公司 | Electronic hydraulic braking system energy accumulator pressure control and fault detection system and method |
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