CN112878413A - Start-stop control system of electric hydraulic excavator - Google Patents
Start-stop control system of electric hydraulic excavator Download PDFInfo
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- CN112878413A CN112878413A CN202011372343.2A CN202011372343A CN112878413A CN 112878413 A CN112878413 A CN 112878413A CN 202011372343 A CN202011372343 A CN 202011372343A CN 112878413 A CN112878413 A CN 112878413A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a start-stop control system of an electric hydraulic excavator, which comprises an electric control cabinet, a high-voltage motor and a cab control system, wherein a high-voltage power supply is sent into the electric control cabinet through an external power supply station, and the electric control cabinet transmits the high-voltage power supply to the high-voltage motor. The electric control cabinet comprises a main circuit and a control circuit, wherein in the main circuit, one end of a high-voltage isolating switch is connected with a high-voltage fuse I and a high-voltage fuse II, the high-voltage fuse I is sequentially connected with a main contactor, a bypass contactor and a current transformer in series to send high-voltage electric energy to the high-voltage motor, and the bypass contactor is connected with a starting reactor in parallel. The high-voltage fuse II is connected with a voltage-reducing circuit, the voltage-reducing circuit divides three power supplies of DC24V, AC220V and AC380V, wherein the AC380V power supply is connected with a detection circuit, and the detection circuit comprises a voltmeter, a voltage sensor, a voltage detector, a motor relay, an ammeter and a temperature controller. The control system can effectively improve the safety and reliability of the high-voltage motor during operation.
Description
Technical Field
The invention relates to the field of electric mechanical control, in particular to a start-stop control system of an electric hydraulic excavator.
Background
With the continuous promotion of the current green and energy revolution, the electric hydraulic excavator adopting electric energy is increasingly paid attention to and applied, and compared with the traditional hydraulic excavator adopting a fuel engine as a power source, the electric hydraulic excavator can really realize zero pollution and zero emission, effectively reduce the application cost while improving the operation efficiency, and meet the current trend of energy conservation and emission reduction. At present, all electric hydraulic excavators use motors as power sources, and adopt control systems formed by circuit breakers and microcomputer protection devices, the systems have large volume, high cost, high system integration level and complex parameter setting and debugging, and are not beneficial to narrow space layout and application under severe working conditions of the excavators; the high-voltage cable at the tail part of the excavator is connected with a high-voltage wire inlet box, so that the excavator is large in size and difficult to disassemble, assemble and maintain; the power supply of the external remote power supply station cannot be controlled to be switched on or off in the cab, so that inconvenience is brought to daily use and maintenance; and the motor is lack of pressure reduction start-stop protection function, and lacks of protection functions under abnormal conditions such as hydraulic butterfly valve switch, fire extinguishing system protection and the like.
Disclosure of Invention
The invention aims to provide a start-stop control system of an electric hydraulic excavator, which optimizes the arrangement space structure, has low cost and ensures that a high-voltage motor runs safely and reliably.
In order to achieve the purpose, the start-stop control system of the electric hydraulic excavator comprises an electric control cabinet, a high-voltage motor and a cab control system, wherein a high-voltage power supply is sent into the electric control cabinet through an external power supply station, and the electric control cabinet sends the high-voltage power supply to the high-voltage motor; the electric control cabinet comprises a main circuit and a control circuit, wherein in the main circuit, one end of a high-voltage isolating switch is connected with a high-voltage fuse I and a high-voltage fuse II, the high-voltage fuse I is sequentially connected with a main contactor, a bypass contactor and a current transformer in series, and high-voltage electric energy is sent to the high-voltage motor; the bypass contactor is connected with the starting reactor in parallel; the high-voltage fuse II is connected with a voltage reduction circuit, three power supplies of DC24V, AC220V and AC380V are divided by the voltage reduction circuit, wherein the AC380V power supply is connected with a detection circuit, the detection circuit comprises a voltmeter, a voltage sensor, a voltage detector, a motor relay, a current meter and a temperature controller, the temperature controller is connected with the high-voltage motor, the current meter is connected with a current transformer, and the motor relay is connected with the current transformer; the DC24V power supply is connected to the cab control system.
Further, the control circuit comprises an indicating circuit and an interlocking protection circuit, the indicating circuit comprises a motor starting indicating lamp, a motor stopping indicating lamp and a motor running indicating lamp which are connected in parallel, and the indicating circuit is connected to the DC24V power supply through the cab control system.
Furthermore, the interlocking protection circuit comprises an over-under voltage switch, a starting reactor fault switch, a motor overheating switch, a motor relay protection switch, an electric control cabinet door switch, an emergency stop switch, a hydraulic butterfly valve switch, a fire extinguishing system protection switch and a main contactor coil which are sequentially connected in series, and is connected with the detection circuit; the interlock protection circuit is connected to an AC220 power source.
Further, the cab control system comprises a main controller, an instrument, a main power coil, a remote starting coil and a remote stopping coil which are connected in parallel, wherein the main power coil, the remote starting coil and the remote stopping coil are connected together, the main controller is connected with the detection circuit and connected with the instrument through a CAN bus, and the instrument is connected with the main power coil, the remote starting coil and the remote stopping coil which are connected in parallel.
Furthermore, the external power supply station sequentially passes through the high-voltage coupler and the current collector to send a high-voltage power supply into the electric control cabinet, and the current collector is connected with the high-voltage isolating switch.
Furthermore, the collector comprises three high-voltage slip rings, a grounding slip ring and two control slip rings, wherein the high-voltage slip rings are used for connecting a high-voltage cable, the control slip rings are used for connecting a control cable, and the grounding slip rings are used for connecting a grounding cable.
The invention has the beneficial effects that: the high-voltage motor is powered by adopting the form of 'a high-voltage fuse, a contactor and a start reactor with a delta-shaped structure', and the system has the advantages of low cost, small space, simple structure and reliable performance. The high-voltage coupler is used as a connection mode of the high-voltage cable, and the operation is simple and reliable. The on-off control signal line of the external power supply station power supply is led into the cab control system through the high-voltage cable, the external power supply station power supply can be controlled to be switched on or switched off in the cab, and the system operation efficiency and safety are improved. By adopting the interlocking protection function, the system can realize the signal detection and protection functions of over-voltage and under-voltage, starting reactor fault, motor overheating, phase failure, phase reversal, over-current, electric control cabinet door switch, emergency stop switch, hydraulic butterfly valve switch, fire extinguishing system protection and the like, and further improves the safety and reliability of the system.
Drawings
FIG. 1 is a schematic diagram of a control system;
FIG. 2 is a high voltage power access diagram of the present control system;
FIG. 3 is a main circuit diagram of the electric control cabinet;
FIG. 4 is an indicating circuit diagram in the control circuit diagram of the electric control cabinet;
FIG. 5 is an interlock protection circuit diagram in the control circuit diagram of the electric control cabinet;
FIG. 6 is a cab control system circuit diagram;
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Fig. 2 to 6 are respective partial diagrams of the overall diagram of the control system, that is, fig. 2 to 6 together constitute the overall diagram of the control system. Wherein, the lower part of the current collector in fig. 2 is connected with an electric display and a high-voltage isolating switch, and the right dotted line (i.e. a control line) of the external power supply station is connected with the main power coil in fig. 6; the low voltage fuse of FIG. 3 is connected to FIG. 5, delivering AC220V power; the switching power supply of fig. 3 delivers DC24V to the cab control system of fig. 6; the voltage sensor, the voltage detector, the motor relay, the temperature controller and the like in the figure 3 are connected with the signal switches in the figure 6; in fig. 6, DC24V power is delivered to the top of fig. 4.
As shown in fig. 1, the start-stop control system of the electric hydraulic excavator comprises an electric control cabinet, a high-voltage motor and a cab control system, wherein a high-voltage power supply is sent into the electric control cabinet through an external power supply station sequentially through a high-voltage coupler and a current collector, the high-voltage power supply is sent into the electric control cabinet, and the electric control cabinet sends the high-voltage power supply to the high-voltage motor. The electric control cabinet comprises a main circuit and a control circuit, a current collector is connected with a high-voltage isolating switch in the main circuit, one end of the high-voltage isolating switch is connected with a high-voltage fuse I and a high-voltage fuse II, the high-voltage fuse I is sequentially connected with a main contactor, a bypass contactor and a current transformer in series, and high-voltage electric energy is sent to the high-voltage motor. The bypass contactor is connected with the starting reactor in parallel, the starting reactor is used for voltage reduction starting of the high-voltage motor, a three-phase coil of the starting reactor is arranged into a finished product font structure, the high-voltage fuse II is connected with the voltage reduction circuit, three voltages of DC24V, AC220V and AC380V are divided by the voltage reduction circuit, wherein an AC380V power supply is connected with the detection circuit, the detection circuit comprises a voltmeter, a voltage sensor, a voltage detector, a motor relay, a current meter and a temperature controller, the temperature controller is connected with the high-voltage motor, the current meter is connected with the current transformer, and the motor relay is connected with the current transformer. In addition, the DC24V power supply is connected to the cab control system. The current collector is arranged at a rotary joint of the rotary table of the excavator, is internally composed of three high-voltage slip rings, a grounding slip ring and two control slip rings, is used for forming three high-voltage main cables, two control cables and a grounding cable, is used for transmitting external electric energy to a vehicle and transmitting an external power supply connection/disconnection control instruction from the vehicle to ensure that the external electric energy is transmitted without damage when the vehicle is operated for 360 degrees.
The high-voltage coupler is used for connecting an internal cable and an external cable of the excavator, and is composed of two identical parts of which the conducting rods are a common connecting piece, and each part comprises a cable leading-in insulation system and a wire holder. The conducting rod is composed of three high pressure rods, two low pressure rods and a grounding rod, one end of the conducting rod is connected with an internal cable of the excavator, the other end of the conducting rod is connected with an external power supply station lead-in cable, and the two ends of the conducting rod are oppositely inserted and fixed above a bracket at the tail part of the excavator.
The high-voltage cable adopted by the control system consists of three high-voltage main cables, two control cables and one grounding cable, the matching high-voltage coupler is connected with a current collector for use, the three high-voltage main cables are led into an external power supply station three-phase power grid, the two control cables are led into the cab control system, and the external power supply station power supply can be switched on or switched off under the control of an external power supply switch.
And a live display and an arrester are further arranged in the main circuit, wherein the live display is connected between the current collector and the high-voltage isolating switch, and the arrester is connected between the high-voltage isolating switch and the high-voltage fuse I.
The control circuit comprises an indicating circuit and an interlocking protection circuit, wherein the indicating circuit comprises a motor starting indicating lamp, a motor stopping indicating lamp and a motor running indicating lamp which are connected in parallel.
The interlocking protection circuit comprises an over-under voltage switch, a starting reactor fault switch, a motor overheating switch, a motor relay protection switch, an electric control cabinet door switch, an emergency stop switch, a hydraulic butterfly valve switch, a fire extinguishing system protection switch and a main contactor coil which are sequentially connected in series, and is connected with the detection circuit. And all the linkage protection switch signals are in a closed state under a normal state. The interlock protection circuit is also provided with a local/remote change-over switch, a local starting button, a local stopping button, a normally open type remote starting contact, a normally closed type remote stopping contact, a bypass contact coil, a normally open type main contactor contact 1, a normally open type main contactor contact 2 and a normally open type bypass contactor contact.
The cab control system comprises a main controller, an instrument, a main power coil, a remote starting coil and a remote stopping coil which are connected in parallel, wherein the main controller is connected with the instrument through a CAN bus, and the instrument is connected with the main power coil, the remote starting coil and the remote stopping coil which are connected in parallel. The main controller is also connected with the detection circuit, collects and processes system voltage, current, temperature and related signal alarm parameters, and sends the parameters to the instrument for man-machine interaction.
The operating principle with respect to the starting and stopping of the motor is as follows:
starting process of the motor: first, the cab external power switch is pressed (see cab control system part of fig. 2), and the main power coil is energized to switch on two control cables among the high-voltage cables from the external power supply station, thereby controlling the external power supply station to switch on the 6kV power supply. The 6kV power grid power supply transmits electric energy to the electric control cabinet through the high-voltage coupler and the current collector in sequence by an external power supply station through a high-voltage cable, if a live display on the electric control cabinet is lightened, the 6kV power supply is normally connected, the high-voltage isolating switch is switched on through the operating rod to supply power to the electric control cabinet system, and the voltmeter indicates about 6000V (+/-10%). The method comprises the steps that a local/remote operation mode change-over switch on an electric control cabinet is set to a remote position, namely a motor remote starting button is pressed on a cab console, a remote starting coil is electrified to enable a remote starting contact in an interlocking protection circuit to be connected, so that a main contactor coil is controlled to be electrified to be connected with a main contactor in a main circuit of the electric control cabinet, a 6kV power supply starts a high-voltage motor through a starting reactor, starting current can be reduced to be within 50% of rated starting current value of the motor, and meanwhile, a main contactor contact 1, a main contactor contact 2, a main contactor contact 3 and a main contactor contact 4 are connected; in the indicating circuit, the contact of the main contactor 4 is disconnected to enable the stop indicating lamp of the main motor to be extinguished, the contact of the main contactor 3 is connected to enable the start indicating lamp of the main motor to be lightened, the time relay 1 and the time relay 2 are powered on and timed simultaneously, when the time is up to 5 seconds, the main motor reaches the rated rotating speed, the contact action of the time relay 1 is connected to enable the coil of the bypass relay to be powered on, the contact of the bypass relay is connected to enable the coil of the bypass contactor in the 220V control circuit to be powered on, so that the bypass contactor in the main circuit of the electric control cabinet is controlled to be connected to supply power for the full-voltage 6kV of the high-voltage motor, the contact of the bypass contactor 1 is connected to enable the operation indicating lamp of the motor to be lightened, the contact of the bypass. Stopping process of the motor: in the normal operation process, if the high-voltage motor stops operating, a motor remote stop button is pressed on a cab console, the remote stop coil is electrified to enable a remote stop contact in a 220V control circuit to be disconnected, so that the main contactor coil is controlled to be powered off to disconnect a main contactor in a main circuit of an electric control cabinet when power is lost, meanwhile, a main contactor contact 2 is disconnected to enable a bypass contactor to be disconnected, a main contactor contact 3 is disconnected to enable a motor operation indicator lamp to be turned off, and a main contactor contact 4 is connected to enable a motor stop indicator lamp to be turned on, so that the motor stop process is completed; if the abnormal condition occurs, the interlocking protection function is implemented through the interlocking protection circuit to stop the motor from running.
The specific implementation process of the interlocking protection function is as follows:
and (3) power supply over-under voltage protection: the voltage detector is arranged near the detection circuit and used for detecting the power supply fluctuation of a 6kV system, the alarm signal switch is connected in the interlocking protection circuit in series, once the power supply fluctuation range exceeds 85-110%, an alarm is given, and meanwhile, the voltage monitor in the interlocking protection circuit is disconnected through the undervoltage signal switch, so that the power supply of the coil of the main contactor is disconnected to stop the operation of the high-voltage motor.
Protection of a starting reactor: in the starting process, a main contactor contact 3 is connected to enable a time relay 1 and a time relay 2 to be powered on and simultaneously time, when the time relay 1 times to 5 seconds, the time relay 1 is in contact action connection to enable a bypass relay coil to be powered on, then the bypass relay is in contact connection to enable a bypass contactor coil in an interlocking protection circuit to be powered on, if the bypass contactor in a main circuit of an electric control cabinet is in normal action connection at the moment, the bypass contactor contact 2 should be disconnected, if the bypass contactor contact 2 is not in normal disconnection, the bypass contactor action is indicated to be abnormal, then the time relay 2 continues to time to 10 seconds to connect a starting fault relay coil, a starting reactor fault contact signal in the interlocking protection circuit is disconnected, and therefore a main contactor coil power supply is disconnected to stop the high-voltage motor.
Overheat protection of a high-voltage motor: a set of PT100 temperature sensor is respectively installed on a three-phase winding of the high-voltage motor and the front shaft and the rear shaft, each set of temperature sensor is respectively connected with a temperature controller, alarm normally closed contacts of the temperature controllers are connected in series to form a high-voltage motor overheating switch group which is connected in series in an interlocking protection circuit, the temperature controller sets a temperature alarm value to be 130 ℃, once the temperature of the high-voltage motor is detected to be overheated to be higher than the alarm value, a motor overheating contact signal in the interlocking protection circuit is disconnected, and therefore a main contactor coil power supply is.
And (4) motor relay protection: the motor relay is arranged on a door plate of the electric control cabinet, is connected with the current transformer and the voltage sensor and collects current and voltage signals, and is integrated with an action indicator lamp, a tripping/resetting button, a current and time setting knob, a function setting switch and the like, so that the overload, phase loss and phase reversal protection functions of the motor are realized by setting parameters, and the alarm protection signal switch is connected in series in an interlocking protection circuit. And once the voltage unbalance in the three phases of the system is detected to continuously exceed 3 seconds, the voltage phase sequence reverse phase is detected to continuously exceed 0.5 second or the over current exceeds the rated current of the motor by 120 percent for 3 seconds, the motor relay protection contact signal in the interlocking protection circuit is disconnected, so that the power supply of the main contactor coil is disconnected to stop the motor running.
And (3) protecting the opening and closing of an electric control cabinet door: the electric control cabinet door approach switches are installed on the inner sides of the cabinet doors, and are used for detecting the switch state of the cabinet doors and preventing live maintenance or personnel from entering mistakenly, the five approach switches are connected in series to form an electric control cabinet door switch group, the electric control cabinet door switch group is connected in series in an interlocking protection circuit, and once any electric control cabinet door is opened, a contact signal of the electric control cabinet door switch group in the interlocking protection circuit is disconnected, so that the main contactor coil power supply is disconnected and the motor stops running.
Protection of an emergency stop switch: the emergency stop switches are arranged in 8 areas such as a whole vehicle cab, a lower cabin, an engine room, a left walking platform and a right walking platform, all normally closed contacts are connected in series to form an emergency stop switch group, the emergency stop switch group is connected in series in the interlocking protection circuit, once any emergency stop switch is pressed, the contact signals of the emergency stop switch group in the interlocking protection circuit are disconnected, and therefore a main contactor coil power supply is disconnected to stop the motor from running.
Protection of a hydraulic butterfly valve switch: the hydraulic butterfly valve switches are mounted on the hydraulic oil tank oil absorption and oil return pipelines and are used for switching on or cutting off the hydraulic oil pipelines, normally closed contacts of the two switches are connected in series to form a butterfly valve switch group, the butterfly valve switch group is connected in series in the interlocking protection circuit, and once any hydraulic butterfly valve switch is closed, a contact signal of the butterfly valve switch group in the interlocking protection circuit is disconnected, so that the main contactor coil power supply is disconnected to stop the motor running.
Protection of a fire extinguishing system: the fire extinguishing system is used for detecting the fire condition of the whole vehicle and extinguishing the fire, the action signal contact of the fire extinguishing system is a normally closed contact, once the fire extinguishing system acts and executes, the contact signal of the fire extinguishing system in the interlocking protection circuit is disconnected, and therefore the power supply of the main contactor coil is disconnected to stop the motor running.
In summary, compared with the prior art, the control system has the advantages that the circuit structure for transmitting the power from the external power supply station to the high-voltage motor is simple, the occupied space is small, and the performance is reliable. Various interlocking protection modes greatly improve the safety and the reliability of the system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes which can be made within the knowledge of those skilled in the art without departing from the gist of the present invention are within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides an electronic hydraulic shovel start-stop control system which characterized in that: the high-voltage power supply is transmitted to the electric control cabinet through an external power supply station, and is transmitted to the high-voltage motor by the electric control cabinet; the electric control cabinet comprises a main circuit and a control circuit, wherein in the main circuit, one end of a high-voltage isolating switch is connected with a high-voltage fuse I and a high-voltage fuse II, the high-voltage fuse I is sequentially connected with a main contactor, a bypass contactor and a current transformer in series, and high-voltage electric energy is sent to the high-voltage motor; the bypass contactor is connected with the starting reactor in parallel; the high-voltage fuse II is connected with a voltage reduction circuit, three power supplies of DC24V, AC220V and AC380V are divided by the voltage reduction circuit, wherein the AC380V power supply is connected with a detection circuit, the detection circuit comprises a voltmeter, a voltage sensor, a voltage detector, a motor relay, a current meter and a temperature controller, the temperature controller is connected with the high-voltage motor, the current meter is connected with a current transformer, and the motor relay is connected with the current transformer; the DC24V power supply is connected to the cab control system.
2. The start-stop control system of the electric hydraulic excavator according to claim 1, characterized in that: the control circuit comprises an indicating circuit and an interlocking protection circuit, the indicating circuit comprises a motor starting indicating lamp, a motor stopping indicating lamp and a motor running indicating lamp which are connected in parallel, and the indicating circuit is connected to a DC24V power supply through a cab control system.
3. An electro-hydraulic excavation start-stop control system according to claim 2, wherein: the interlocking protection circuit comprises an over-under voltage switch, a starting reactor fault switch, a motor overheating switch, a motor relay protection switch, an electric control cabinet door switch, an emergency stop switch, a hydraulic butterfly valve switch, a fire extinguishing system protection switch and a main contactor coil which are sequentially connected in series, and is connected with the detection circuit; the interlock protection circuit is connected to an AC220 power source.
4. The start-stop control system of the electric hydraulic excavator according to claim 1, characterized in that: the cab control system comprises a main controller, an instrument, a main power coil, a remote starting coil and a remote stopping coil which are connected in parallel, wherein the main power coil, the remote starting coil and the remote stopping coil are connected together, the main controller is connected with the detection circuit, the main controller is connected with the instrument through a CAN bus, and the instrument is connected with the main power coil, the remote starting coil and the remote stopping coil which are connected in parallel.
5. The start-stop control system of the electric hydraulic excavator according to claim 1, characterized in that: and the external power supply station sequentially passes through the high-voltage coupler and the current collector to send a high-voltage power supply into the electric control cabinet, and the current collector is connected with the high-voltage isolating switch.
6. The start-stop control system of the electric hydraulic excavator according to claim 5, wherein: the collector comprises three high-voltage slip rings, a grounding slip ring and two control slip rings, wherein the high-voltage slip rings are used for connecting a high-voltage cable, the control slip rings are used for connecting a control cable, and the grounding slip rings are used for connecting a grounding cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011372343.2A CN112878413A (en) | 2020-11-30 | 2020-11-30 | Start-stop control system of electric hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011372343.2A CN112878413A (en) | 2020-11-30 | 2020-11-30 | Start-stop control system of electric hydraulic excavator |
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| Publication Number | Publication Date |
|---|---|
| CN112878413A true CN112878413A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011372343.2A Pending CN112878413A (en) | 2020-11-30 | 2020-11-30 | Start-stop control system of electric hydraulic excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112020452A (en) * | 2018-02-20 | 2020-12-01 | 斯托巴电子系统有限责任公司 | Drive train with batteries outputting two different voltages, electric drive system with high voltage windings surrounding low voltage bars, electric motor with separate high voltage pulse inverter and method for operating an electric motor |
| CN112020452B (en) * | 2018-02-20 | 2024-07-23 | 胡贝尔汽车公司 | Drive train, electric drive system, electric motor and method for operating an electric motor |
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Application publication date: 20210601 |
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