CN111395241A - Accurate and efficient motor rotating speed control method and road sweeper - Google Patents
Accurate and efficient motor rotating speed control method and road sweeper Download PDFInfo
- Publication number
- CN111395241A CN111395241A CN202010285659.1A CN202010285659A CN111395241A CN 111395241 A CN111395241 A CN 111395241A CN 202010285659 A CN202010285659 A CN 202010285659A CN 111395241 A CN111395241 A CN 111395241A
- Authority
- CN
- China
- Prior art keywords
- motor
- hydraulic pump
- rotating speed
- fan
- disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an accurate and efficient motor rotating speed control method and a road sweeper, and belongs to the technical field of sanitation vehicles. The fan motor driver, the hydraulic pump motor driver and the display are connected with the controller through a CAN bus; the fan motor driver is electrically connected with the fan motor, and the fan motor is mechanically and directly connected with the fan; the hydraulic pump motor driver is electrically connected with the hydraulic pump motor, and the hydraulic pump motor is mechanically and directly connected with the hydraulic pump; the hydraulic pump provides a power oil source for the disc brush motor, the disc sweeping oil cylinder, the sucker oil cylinder and the water pump through a hydraulic system. The fan and the hydraulic pump are regulated through the PI of the controller, so that the independent closed-loop control of the rotating speed is realized, and the problem that the rotating speeds of the traditional sweeping machines are mutually restricted is solved; the rotating speed of the fan adopts a standard, powerful and energy-saving three-gear quick adjusting mode, and manual fine adjustment is combined, so that the special use working condition of individual users can be met; based on the relation between the flow and the speed of each actuating mechanism of the sweeping machine, the multistage self-adaptive matching of the rotating speed of the hydraulic pump is realized.
Description
Technical Field
The invention relates to the technical field of sanitation vehicles, in particular to an accurate and efficient motor rotating speed control method and a sweeping vehicle.
Background
The power output device of the pure electric sweeping machine in the environmental sanitation industry generally adopts a single motor to drive a belt to simultaneously drive a fan and a hydraulic pump, part manufacturers adopt a single motor to drive a speed changer, the speed changer outputs two ports to respectively drive the fan and the oil pump to operate, and the control strategy of diesel oil auxiliary emission is still maintained to the rotating speed control of the motor, and the power output device has the defects that:
the motor rotating speed is restricted by the fan rotating speed and can not be flexibly adjusted, the displacement of the hydraulic pump is influenced by the fan rotating speed change, the action execution time difference is large, the restriction between the action execution time difference and the hydraulic pump is serious, and the rotating speed can not be accurately and efficiently adjusted.
Disclosure of Invention
In order to solve the technical problems, the invention provides an accurate and efficient motor rotating speed control method and a sweeping machine. The fan and the hydraulic pump are independently controlled by the double motors, the rotating speeds of the fan and the hydraulic pump can be adjusted in real time by the closed-loop independent control of the double motors, and compared with an original control mode, the control method is accurate and efficient in adjustment and high in system stability.
The invention is realized by the following technical scheme that a fan motor driver, a hydraulic pump motor driver and a display are connected with a controller in a control box through a CAN bus, the fan motor driver is electrically connected with a fan motor, the fan motor is mechanically and directly connected with a fan, the hydraulic pump motor driver is electrically connected with a hydraulic pump motor, the hydraulic pump motor is mechanically and directly connected with a hydraulic pump, the hydraulic pump provides a power oil source for a disc brush motor, a sweeping disc oil cylinder, a sucking disc oil cylinder and a water pump through a hydraulic system, rotary encoders are respectively arranged in the fan motor and the hydraulic pump motor and transmit rotating speed signals to the corresponding fan motor driver and the corresponding hydraulic pump motor driver, the fan motor driver and the hydraulic pump motor driver transmit the rotating speed signals to the controller, and the controller adjusts the frequency in real time to reach a target rotating speed through a formula n =60 × f/P by adopting a PI control mode, wherein n is the rotating speed, f is the frequency, and P is the motor pole.
It further comprises the following steps: the fan motor is provided with three fan operation modes of standard, powerful and energy-saving, and the rotating speeds of the corresponding fan motors are 2100rpm, 2300rpm and 1700rpm respectively; the operation mode of the fan motor is controlled by one key of the display, the rotation speed of the fan motor is set to realize memory storage through the controller, and the previous operation mode is automatically selected during the next operation.
The fan motor is provided with a rotating speed fine adjustment switch, and the amplitude modulation is 50 rpm.
The disc brush motor drives the disc brush device;
according to the formula one Q = n1 × v × 0.9.9,
wherein, the flow rate required by the Q disc brush motor, the rotating speed required by a sweeping disc in the n1 disc brush device, the displacement of the v disc brush motor and 0.9 is the efficiency coefficient of the disc brush motor;
formula two n2= Q ÷ 0.92 × 1000,
wherein n2 hydraulic pump rotating speed, Q dish brush motor required flow, 0.92 hydraulic pump efficiency coefficient, 1000 is conversion coefficient;
obtaining the constant relation between the rotating speed of the sweeping disc in the disc brush device and the rotating speed of the hydraulic pump, and realizing stepless speed regulation of the sweeping disc;
in the same way, the constant relation between the expansion time of the sweeping disc oil cylinder and the sucking disc oil cylinder and the rotating speed of the water pump and the rotating speed of the hydraulic pump can be obtained;
and setting the rotation speeds of the hydraulic pump motor corresponding to the disc brush motor, the disc sweeping oil cylinder, the sucking disc oil cylinder and the water pump based on a constant relation, and realizing multi-stage regulation.
The fan motor and the hydraulic pump motor are both permanent magnet synchronous motors.
The running states of the rotating speed bus voltage of the fan motor and the hydraulic pump motor and the fault alarm CAN be checked in real time in the display through the CAN bus.
A road sweeper is characterized in that a fan motor driver is arranged below an oil tank; the hydraulic pump motor driver is arranged on one side of the fan; the display is mounted in the cab; the fan motor is arranged above the control box; the hydraulic pump motor is arranged on the right side of the box body.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the following steps that 1, a fan and a hydraulic pump are regulated through a controller PI, independent closed-loop control of the rotating speed is achieved, the problem that the rotating speed of a traditional sweeping machine is restricted mutually is solved (for example, when the fan idles, the rotating speed of the hydraulic pump is low, the time required for completing corresponding actions is prolonged, and partial actions can not be completed;
2, the rotating speed of the fan adopts a standard, powerful and energy-saving three-gear quick adjusting mode, manual fine adjustment is combined, the rotating speed adjustment is flexible, special use conditions of individual users can be met, and the environment adaptability is strong; for example, when the road surface cleanliness of partial areas is high, the rotating speed can be reduced to achieve the purpose of energy conservation;
3, based on the relation between the flow and the speed of each executing mechanism of the sweeping machine, the rotating speed of the motor required by each mechanism is calculated, multistage self-adaptive matching of the rotating speed of the hydraulic pump is realized, the action executing efficiency is high, the stability is high, multistage speed regulation of the sweeping brush is realized, the speed regulating range is wider, and the environmental suitability is high;
and 4, the CAN bus is adopted to realize data real-time interaction, the running states of the rotating speed bus voltage of the fan motor and the oil pump motor and the fault alarm CAN be checked in real time on the display, the information integration level is high, and the fault analysis is convenient and fast.
Drawings
FIG. 1 is a circuit schematic of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a top view of the present invention;
in the figure: 1. lifting the oil cylinder; 2. a fan motor driver; 3. a control box; 4. a disc brush motor; 5. a display; 6. a sweeping disc oil cylinder; 7. a disc brush device; 8. a hydraulic pump motor; 9. an electromagnetic valve group; 10. a fan motor; 11. a sucker cylinder; 12. a water pump; 13. a hydraulic pump; 14. a hydraulic pump motor drive.
Detailed Description
The following are specific embodiments of the present invention, and the present invention will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 1, a fan motor driver 2, a hydraulic pump motor driver 14, and a display 5 are connected to a controller in a control box 3 through a CAN bus, and data is interacted in real time. The running state and the fault alarm of the rotating speed bus voltage of the fan motor 10 and the hydraulic pump motor 8 CAN be checked in real time in the display 5 through the CAN bus. The display can check the motor parameters and the running state in real time, and the informatization integration level is high.
The fan motor driver 2 is electrically connected with the fan motor 10, and the fan motor 10 is mechanically and directly connected with the fan. The hydraulic pump motor driver 14 is electrically connected with the hydraulic pump motor 8, and the hydraulic pump motor 8 is mechanically and directly connected with the hydraulic pump 13; the hydraulic pump 13 provides a power oil source for the disc brush motor 4, the disc sweeping oil cylinder 6, the sucking disc oil cylinder 11 and the water pump 12 through a hydraulic system, the hydraulic system comprises an electromagnetic valve group 9, and the hydraulic system is used as the prior common technology and is not further limited in the embodiment.
The accurate and efficient motor rotating speed control method comprises the following steps:
the fan motor 10 and the hydraulic pump motor 8 both adopt permanent magnet synchronous motors, rotary encoders are mounted inside the fan motor 10 and the hydraulic pump motor 8 and transmit rotating speed signals to the corresponding fan motor driver 2 and the corresponding hydraulic pump motor driver 14, the fan motor driver 2 and the hydraulic pump motor driver 14 transmit the rotating speed signals to the controller, and the controller adjusts the frequency in real time to reach a target rotating speed by a formula n =60 × f ÷ P (n is the rotating speed, f is the frequency, and P is the number of pole pairs of the motor) according to the rotating speed signals by adopting a PI control mode, so that the rotating speed closed-loop control is realized.
The fan motor 10 is provided with three fan operation modes of standard, powerful and energy-saving, and the rotating speeds of the corresponding fan motor 10 are 2100rpm, 2300rpm and 1700rpm respectively; the operation mode of the fan motor 10 is controlled by one key of the display 5, the rotation speed of the fan motor 10 is set to realize memory storage through the controller, and the previous operation mode is automatically selected in the next operation. Preferably, the fan motor 10 is provided with a rotating speed fine adjustment switch, the amplitude modulation is 50rpm, the special use working condition of individual users can be met, and the environmental adaptability is wider.
The disc brush motor 4 drives the disc brush device 7;
according to the formula one Q = n1 × v × 0.9.9,
wherein, the flow rate required by the Q disc brush motor, the rotating speed required by a sweeping disc in the n1 disc brush device, the displacement of the v disc brush motor and 0.9 is the efficiency coefficient of the disc brush motor;
formula two n2= Q ÷ 0.92 × 1000,
wherein n2 hydraulic pump rotating speed, Q dish brush motor required flow, 0.92 hydraulic pump efficiency coefficient, 1000 is conversion coefficient;
obtaining the constant relation between the rotating speed of the sweeping disc in the disc brush device 7 and the rotating speed of the hydraulic pump 13; in the same way, the constant relation between the expansion time of the sweeping disc oil cylinder 6 and the sucking disc oil cylinder 11 and the rotating speed of the water pump 12 and the rotating speed of the hydraulic pump 13 can be obtained;
and setting the rotating speeds of the hydraulic pump motor 8 corresponding to the disc brush motor 4, the disc sweeping oil cylinder 6, the sucking disc oil cylinder 11 and the water pump 12 based on a constant relation, and realizing multi-stage regulation. For example: the rotation speed of the sweeping disc oil cylinder corresponds to 700rpm, the rotation speed of the lifting oil cylinder corresponds to 1200rpm, the rotation speed of the sucking disc oil cylinder corresponds to 900rpm, and the rotation speed of the water pump corresponds to 2300 rpm.
Example two
A sweeping machine is disclosed, which is combined with the figures 2 and 3, on the basis of the first embodiment, a fan motor driver 2 is arranged below an oil tank; the hydraulic pump motor driver 14 is arranged on one side of the fan; the display 5 is mounted in the cab; the fan motor 10 is arranged above the control box 3; the hydraulic pump motor 8 is arranged on the right side of the box body.
The fan and the hydraulic pump are independently controlled, and the problem that the rotation speeds of the traditional sweeping machine are mutually restricted is solved (for example, when the fan is in idle speed, the rotation speed of the hydraulic pump is low, the time required for completing corresponding actions is prolonged, and partial actions can not be completed, when the fan runs at high speed, the rotation speed of the hydraulic pump is high, the system action is too fast, and hidden troubles exist on the stability of a hydraulic system). Thereby realizing the multi-stage, accurate and efficient control of the rotating speed of the motor.
Claims (7)
1. An accurate and efficient motor rotating speed control method is characterized in that:
the fan motor driver (2), the hydraulic pump motor driver (14) and the display (5) are connected with a controller in the control box (3) through a CAN bus;
the fan motor driver (2) is electrically connected with a fan motor (10), and the fan motor (10) is mechanically and directly connected with a fan;
the hydraulic pump motor driver (14) is electrically connected with the hydraulic pump motor (8), and the hydraulic pump motor (8) is mechanically and directly connected with the hydraulic pump (13); the hydraulic pump (13) provides a power oil source for the disc brush motor (4), the disc sweeping oil cylinder (6), the sucking disc oil cylinder (11) and the water pump (12) through a hydraulic system;
the fan motor (10) and the hydraulic pump motor (8) are internally provided with rotary encoders, the rotary encoders transmit rotating speed signals to corresponding fan motor drivers (2) and hydraulic pump motor drivers (14), the fan motor drivers (2) and the hydraulic pump motor drivers (14) transmit the rotating speed signals to the controller, and the controller adjusts the frequency in real time to reach a target rotating speed according to the rotating speed signals through a formula n =60 × f/P in a PI control mode, wherein n is the rotating speed, f is the frequency, and P is the number of pole pairs of the motor.
2. The method for accurately and efficiently controlling the rotating speed of the motor according to claim 1, wherein: the fan motor (10) is provided with three fan operation modes of standard, powerful and energy-saving, and the rotating speeds of the corresponding fan motor (10) are 2100rpm, 2300rpm and 1700rpm respectively; the operation mode of the fan motor (10) is controlled by one key of the display (5), the rotating speed setting of the fan motor (10) realizes memory storage through the controller, and the previous operation mode is automatically selected when the next operation is carried out.
3. The method of claim 2, wherein the method comprises the steps of: the fan motor (10) is provided with a rotating speed fine adjustment switch, and the amplitude modulation is 50 rpm.
4. A method for accurate and efficient control of the rotational speed of an electric motor according to claim 2 or 3, characterized in that: the disc brush motor (4) drives the disc brush device (7);
according to the formula one Q = n1 × v × 0.9.9,
wherein, the flow rate required by the Q disc brush motor, the rotating speed required by a sweeping disc in the n1 disc brush device, the displacement of the v disc brush motor and 0.9 is the efficiency coefficient of the disc brush motor;
formula two n2= Q ÷ 0.92 × 1000,
wherein n2 hydraulic pump rotating speed, Q dish brush motor required flow, 0.92 hydraulic pump efficiency coefficient, 1000 is conversion coefficient;
obtaining the constant relation between the rotating speed of the sweeping disc in the disc brush device (7) and the rotating speed of the hydraulic pump (13), and realizing stepless speed regulation of the sweeping disc;
in the same way, the constant relation between the expansion time of the sweeping disc oil cylinder (6) and the sucking disc oil cylinder (11) and the rotating speed of the water pump (12) and the rotating speed of the hydraulic pump (13) can be obtained;
and the rotating speeds of the hydraulic pump motor (8) corresponding to the disc brush motor (4), the disc sweeping oil cylinder (6), the sucking disc oil cylinder (11) and the water pump (12) are set based on a constant relation, so that multi-stage regulation is realized.
5. The method for accurately and efficiently controlling the rotating speed of the motor according to claim 1, wherein: the fan motor (10) and the hydraulic pump motor (8) both adopt permanent magnet synchronous motors.
6. The method for accurately and efficiently controlling the rotating speed of the motor according to claim 1, wherein: the running state and the fault alarm of the rotating speed bus voltage of the fan motor (10) and the hydraulic pump motor (8) CAN be checked in real time in the display (5) through the CAN bus.
7. A road sweeper comprising the accurate and efficient motor speed control method of any one of claims 1-6, characterized in that: the fan motor driver (2) is arranged below the oil tank; the hydraulic pump motor driver (14) is arranged on one side of the fan; the display (5) is mounted in a cab; the fan motor (10) is arranged above the control box (3); and the hydraulic pump motor (8) is arranged on the right side of the box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010285659.1A CN111395241A (en) | 2020-04-13 | 2020-04-13 | Accurate and efficient motor rotating speed control method and road sweeper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010285659.1A CN111395241A (en) | 2020-04-13 | 2020-04-13 | Accurate and efficient motor rotating speed control method and road sweeper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111395241A true CN111395241A (en) | 2020-07-10 |
Family
ID=71436908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010285659.1A Pending CN111395241A (en) | 2020-04-13 | 2020-04-13 | Accurate and efficient motor rotating speed control method and road sweeper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111395241A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117926745A (en) * | 2024-03-21 | 2024-04-26 | 华侨大学 | Electric sweeper with multi-motor power system and control method, device and medium thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130649A (en) * | 2011-01-30 | 2011-07-20 | 鞍山起重控制设备有限公司 | Voltage regulation and speed regulation control system of full-digital speed and current double closed-loop alternating current motor |
| CN203102031U (en) * | 2012-09-16 | 2013-07-31 | 于万海 | Speed-adapting cleaning control system for electric street cleaner |
| CN103290800A (en) * | 2013-06-19 | 2013-09-11 | 合肥华信电动科技发展有限公司 | Electric sanitation vehicle sweeping disk system of permanent magnet brushless direct-current motors based on CAN bus |
| DE102013108938A1 (en) * | 2012-08-20 | 2014-02-20 | Hitachi Koki Co., Ltd. | Electric working machine |
| CN103669265A (en) * | 2013-12-20 | 2014-03-26 | 北京智行鸿远汽车技术有限公司 | Pure electric environmental sanitation vehicle drive motor control method based on CAN network |
| CN104060569A (en) * | 2014-06-26 | 2014-09-24 | 徐工集团工程机械股份有限公司 | Saline solution flow control method and device as well as pre-wetting system of snow-removing spreader |
| CN104518716A (en) * | 2014-12-29 | 2015-04-15 | 黑龙江大学 | Closed loop control system for miniature direct current motor and control method for system |
| CN204681272U (en) * | 2015-05-19 | 2015-09-30 | 广东玛西尔电动科技有限公司 | A kind of ground washing vehicle control system |
| CN105525585A (en) * | 2016-01-20 | 2016-04-27 | 山东中泰弘业新能源科技有限公司 | Pure electric environmental sanitation cleaning and sweeping vehicle |
| CN109322266A (en) * | 2018-11-27 | 2019-02-12 | 徐州徐工环境技术有限公司 | Sweeping machine and sweeping machine brush speed regulating method |
| CN208904886U (en) * | 2018-08-24 | 2019-05-24 | 上海沪工焊接集团股份有限公司 | A kind of multi-motor synchronous control circuit |
| CN209652832U (en) * | 2018-11-27 | 2019-11-19 | 徐州徐工环境技术有限公司 | Sweeping machine |
-
2020
- 2020-04-13 CN CN202010285659.1A patent/CN111395241A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130649A (en) * | 2011-01-30 | 2011-07-20 | 鞍山起重控制设备有限公司 | Voltage regulation and speed regulation control system of full-digital speed and current double closed-loop alternating current motor |
| DE102013108938A1 (en) * | 2012-08-20 | 2014-02-20 | Hitachi Koki Co., Ltd. | Electric working machine |
| CN203102031U (en) * | 2012-09-16 | 2013-07-31 | 于万海 | Speed-adapting cleaning control system for electric street cleaner |
| CN103290800A (en) * | 2013-06-19 | 2013-09-11 | 合肥华信电动科技发展有限公司 | Electric sanitation vehicle sweeping disk system of permanent magnet brushless direct-current motors based on CAN bus |
| CN103669265A (en) * | 2013-12-20 | 2014-03-26 | 北京智行鸿远汽车技术有限公司 | Pure electric environmental sanitation vehicle drive motor control method based on CAN network |
| CN104060569A (en) * | 2014-06-26 | 2014-09-24 | 徐工集团工程机械股份有限公司 | Saline solution flow control method and device as well as pre-wetting system of snow-removing spreader |
| CN104518716A (en) * | 2014-12-29 | 2015-04-15 | 黑龙江大学 | Closed loop control system for miniature direct current motor and control method for system |
| CN204681272U (en) * | 2015-05-19 | 2015-09-30 | 广东玛西尔电动科技有限公司 | A kind of ground washing vehicle control system |
| CN105525585A (en) * | 2016-01-20 | 2016-04-27 | 山东中泰弘业新能源科技有限公司 | Pure electric environmental sanitation cleaning and sweeping vehicle |
| CN208904886U (en) * | 2018-08-24 | 2019-05-24 | 上海沪工焊接集团股份有限公司 | A kind of multi-motor synchronous control circuit |
| CN109322266A (en) * | 2018-11-27 | 2019-02-12 | 徐州徐工环境技术有限公司 | Sweeping machine and sweeping machine brush speed regulating method |
| CN209652832U (en) * | 2018-11-27 | 2019-11-19 | 徐州徐工环境技术有限公司 | Sweeping machine |
Non-Patent Citations (2)
| Title |
|---|
| 冯嫦等: "《装备制造技术丛书 工业自动化控制技术》", 31 December 2015, 广东高等教育出版社 * |
| 周佰和等: "《汽车发动机电子控制技术》", 30 September 2015, 西南交通大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117926745A (en) * | 2024-03-21 | 2024-04-26 | 华侨大学 | Electric sweeper with multi-motor power system and control method, device and medium thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102549219B (en) | Hybrid construction machine | |
| CN102869838B (en) | For the control system of hybrid excavator | |
| US8136271B2 (en) | Hydraulic unit and construction machine including the same | |
| US20130011233A1 (en) | Construction machine | |
| CN102421648A (en) | Energy system for a hybrid vehicle | |
| CN103999351A (en) | Switching strategy for switched reluctance machine | |
| US9340113B2 (en) | Switched reluctance generator integrated controls | |
| CN113605486B (en) | Loader traveling control system and control method thereof, loader and vehicle control unit | |
| CN111395241A (en) | Accurate and efficient motor rotating speed control method and road sweeper | |
| CN111645797A (en) | Two-wheeled electric motor car actuating system | |
| CN104488187A (en) | Compensating hysteresis bands to hold specified switching frequency | |
| CN201134782Y (en) | Speed regulating system of generator | |
| CN202227375U (en) | Automatic throttle control system for static hydraulic bulldozer | |
| CN111119015A (en) | Automatic switching control system and control method for travelling gears of milling machine | |
| CN110588631B (en) | Control method of hybrid power system | |
| CN113565166A (en) | Hydraulic system based on positive flow control and control method | |
| CN217238675U (en) | Control system of distributed driving system and electric sanitation vehicle | |
| CN219467526U (en) | Electrohydraulic integrated loader power transmission system | |
| CN215361231U (en) | Transmission control system of electric loader | |
| CN218929167U (en) | Energy-saving environment-friendly electric washing and sweeping vehicle | |
| CN218027056U (en) | Traveling system and pure electric paver | |
| CN114320818B (en) | Pumping system control method, pumping system and engineering machinery | |
| CN111379236A (en) | Pure electric washing and sweeping vehicle and distributed power device thereof | |
| CN117868251A (en) | Main pump control system of electric excavator | |
| CN220053513U (en) | Single-shot washing and sweeping vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200710 |