Power unit for aerial work platform and aerial work platform

Abstract

The invention discloses a power unit for an aerial work platform and the aerial work platform. The power unit comprises a walking motor, a lifting motor and a single motor controller, the motor controller comprises a control module, a power inversion module and a circuit switching module, the power inversion module inverts direct current into three-phase adjustable alternating current, and the walking motor and the lifting motor are in signal connection with the control module; the power inversion module can be selectively connected to any one of the walking motor and the lifting motor through the circuit switching module. The walking motor and the lifting motor can be controlled in a switching mode through the single motor controller, cost can be reduced, the equipment installation space can be optimized, hardware detection and software protocols of the walking motor and the lifting motor can be unified, and more accurate fault diagnosis can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aerial work, and in particular to a power unit for an aerial work platform and an aerial work platform. Background Art

[0002] Aerial work platforms are products that serve high-altitude operations, equipment installation, maintenance and other mobile high-altitude operations in various industries. Types include scissor-type aerial work platforms and arm-type aerial work platforms.

[0003] Generally speaking, an aerial work platform includes a base, a lifting mechanism (scissor type or arm type), a working platform, a power unit and a vehicle controller. The lifting mechanism is arranged on the base, and the working platform is arranged on the lifting mechanism. The lifting mechanism can control the work platform to rise / lower to a suitable working height.

[0004] Moreover, the base is provided with wheels, and the lifting mechanism is controlled by a hydraulic system or an electric cylinder. Thus, the power unit includes a walking unit and a lifting unit to control the walking and lifting actions of the aerial work platform respectively. These units are controlled by the vehicle controller. Due to the complex structure and large number of accessories of the aerial work platform, the cost is high. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a power unit for an aerial work platform and an aerial work platform which can reduce costs.

[0006] The present invention provides the following technical solutions:

[0007] A power unit for an aerial work platform includes a travel motor, a lifting motor and a single motor controller, wherein the motor controller includes a control module, a power inverter module for inverting direct current into three-phase adjustable alternating current, and a circuit switching module, wherein the circuit switching module can selectively connect the power inverter module to either the travel motor or the lifting motor.

[0008] Optionally, in the above-mentioned power unit, the circuit switching module includes a walking control switch connected to the walking motor and a lifting control switch connected to the lifting motor. During operation, the control module controls the opening and closing of the walking control switch and the lifting control switch so that at most only one of the two is in the on state at the same time.

[0009] Optionally, in the above-mentioned power unit, the travel control switch and the lifting control switch are selected from any one or any combination of an IGBT module, a MOSFIT module, a relay module, and a circuit breaker module.

[0010] Optionally, in the above-mentioned power unit, the control module, the power inverter module and the circuit switching module are encapsulated in the same shell; or, the control module and the power inverter module are encapsulated in the same shell, and the circuit switching module is located outside the shell.

[0011] Optionally, in the above power unit, the travel motor includes a first travel motor and a second travel motor;

[0012] The power inverter module includes a first power inverter module and a second power inverter module;

[0013] The travel control switch includes a first travel control switch connecting the first travel motor to the first power module and a second travel control switch connecting the second travel motor to the second power module;

[0014] The control module controls the first travel control switch and the second travel control switch to open and close synchronously.

[0015] Optionally, in the above-mentioned power unit, the lifting control switch includes a first lifting control switch and a second lifting control switch arranged in parallel, wherein: the first lifting control switch is arranged between the first power inverter module and the single lifting motor; the second lifting control switch is arranged between the second power inverter module and the single lifting motor; the control module controls the first lifting control switch and the second lifting control switch to open and close synchronously.

[0016] Optionally, in the above-mentioned power unit, the first walking control switch, the second walking control switch, the first lifting control switch, and the second lifting control switch are respectively connected to the control module signal.

[0017] Optionally, in the above power unit, the first travel control switch and the second travel control switch are integrated into a travel master switch, and the travel master switch includes at least six travel switch units arranged in parallel and opened and closed synchronously, wherein three of the travel switch units constitute the first travel control switch, and the other three of the travel switch units constitute the second travel control switch; the travel master switch is connected to the control module signal;

[0018] and / or,

[0019] The first lift control switch and the second lift control switch are integrated in a lift master switch, which includes at least six lift switch units that are arranged in parallel and opened and closed synchronously, wherein three of the lift switch units constitute the first lift control switch and the other three of the lift switch units constitute the second lift control switch; the lift master switch is signal-connected to the control module.

[0020] Optionally, in the above-mentioned power unit, the travel control switch and the lifting control switch are integrated in a single switching switch, which are respectively the first contact connection position and the second contact connection position of the switching switch.

[0021] Optionally, in the above power unit, the travel motor includes a first travel motor and a second travel motor, the power inverter module includes a first power inverter module and a second power inverter module, and the circuit switching module includes a first travel control switch connecting the first travel motor to the first power module and a second travel control switch connecting the second travel motor to the second power module;

[0022] The lifting control switch comprises a first lifting control switch and a second lifting control switch which are arranged in parallel between the first power inverter module, the second power inverter module and the single lifting motor;

[0023] The first travel control switch and the second travel control switch constitute the first contact connection position;

[0024] The first lift control switch and the second lift control switch constitute the second contact connection position.

[0025] A high-altitude work platform comprises a base, a lifting mechanism, a working platform and a vehicle controller, wherein the two ends of the lifting mechanism are respectively connected to the base and the working platform; and further comprises the power unit mentioned above, wherein the motor controller receives a signal from the vehicle controller and controls the travel motor and the lifting motor in a switchable manner.

[0026] It can be seen from the above technical solution that in the power unit and aerial work platform provided by the present invention, a single motor controller can control the travel motor and the lifting motor in a switching manner, which is equivalent to integrating two motor controllers into one. It has at least the following advantages:

[0027] a) A single motor controller uses a set of hardware layout, which can reduce the hardware redundancy caused by two sets of motor controllers in the comparative embodiment, which is conducive to reducing equipment costs;

[0028] b) Using only one motor controller is conducive to optimizing the equipment installation space, for example, it can increase the installation space inside the installation bin, or reduce the occupied volume of the installation bin;

[0029] c) It is conducive to unifying the hardware detection and software protocols of the travel motor and the lifting motor, and realizing more accurate fault diagnosis;

[0030] d) It is helpful to reduce the installation process and testing process and time required by the OEM, and reduce labor costs and time costs;

[0031] e) It can avoid communication failures and other failures caused by different software protocols, control logics, fault alarm codes and alarm methods, and open permissions of the motor controllers of the walking motor and the lifting motor due to different manufacturers, thereby improving system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the connection structure of the power unit provided in the comparative embodiment.

[0034] Figure 2 It is a schematic diagram of the connection structure of the power unit provided in the first exemplary embodiment.

[0035] Figure 3 It is a schematic diagram of the connection structure of the power unit provided in the second exemplary embodiment.

[0036] Figure 4 It is a schematic diagram of the connection structure of the power unit provided in the third exemplary embodiment.

[0037] Figure 5 It is a schematic diagram of the connection structure of the aerial work platform provided in the fourth exemplary embodiment.

[0038] in:

[0039] 1- Walking motor controller,

[0040] 101-first walking power inverter module, 102-second walking power inverter module,

[0041] 103- Walking control module,

[0042] 2-lifting motor controller, 201-lifting power inverter module, 202-lifting control module.

[0043] 3-motor controller, 4-vehicle controller, 5-other controllers,

[0044] 31-power inverter module, 32-, 33-circuit switching module,

[0045] 311-first power inverter module, 312-second power inverter module,

[0046] M1-travel motor, M2-lifting motor,

[0047] M 11 -First travel motor, M 12 - Second travel motor,

[0048] S1-travel control switch,

[0049] S 11 -The first travel control switch, S 12 -The second travel control switch,

[0050] S2-lift control switch, S 21 -First lift control switch, S 21 - Second lift control switch,

[0051] S 01 -Travel master switch, S 02 - Lift master switch,

[0052] S0- switch main switch, S 001 -First contact connection position, S 002 - Second contact connection point. DETAILED DESCRIPTION

[0053] In order to conveniently illustrate the innovative technical points and beneficial effects of the present invention, this specification provides a comparative embodiment and multiple exemplary embodiments.

[0054] The following will be combined with the drawings in the embodiments to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Comparative Example (Prior Art)

[0056] In a comparative embodiment of the present invention, an aerial work platform is provided, wherein the power unit thereof comprises a walking unit and a lifting unit. Since the walking action and the lifting action are performed independently of each other, the installation settings of the walking unit and the lifting unit in the aerial work platform are independent of each other.

[0057] See also Figure 1 The walking unit includes wheels, a walking motor M1 for driving the wheels to rotate, and a walking motor controller 1 for controlling the movement of the walking motor M1.

[0058] The travel motor M1 includes a first travel motor M 11 and the second travel motor M 12 The walking motor controller 1 includes a first walking power inverter module 101, a second walking power inverter module 102 and a walking control module 103. The first walking power inverter module 101 and the second walking power inverter module 102 are used to invert DC power into three-phase adjustable AC power and transmit it to the first walking motor M respectively. 11 and the second travel motor M 12 ; The first travel motor M 11 and the second travel motor M 12 The first walking motor M is respectively connected to the walking control module 103 by signal so as to control the first walking motor M through the walking control module 103. 11 and the second travel motor M 12 The execution action and running state of the vehicle are controlled and monitored. Moreover, the travel motor controller 1 is connected to the vehicle controller and can send the motor running state to the vehicle controller (VCU).

[0059] See also Figure 1 The lifting unit includes an electric cylinder or a hydraulic system, a lifting motor M2 for providing power to the electric cylinder or the hydraulic system, and a lifting motor controller 2 for controlling the action of the lifting motor M2. The lifting motor M2 drives the electric cylinder or the hydraulic system to control the lifting and lowering of the working platform.

[0060] The lifting motor controller 2 includes a lifting power inverter module 201 and a lifting control module 202. The lifting power inverter module 201 is used to invert DC power into three-phase adjustable AC power and transmit it to the lifting motor M2; the lifting motor M2 is connected to the lifting control module 202 signal to control and monitor the execution action and operation status of the lifting motor M2 through the lifting control module 202. Moreover, the lifting motor controller 2 is connected to the vehicle controller and can send the motor operation status to the vehicle controller (VCU).

[0061] The inventor found that the existing aerial work platform is expensive, the installation space is crowded, and the walking motor M1 and the lifting motor M2 often use different software protocols, control logics, fault alarm codes and alarm methods, and open permissions due to different manufacturers, resulting in communication conflicts or communication failures and other failures. Even the vehicle VCU has its own software protocol and fault code, which makes fault diagnosis difficult. The inventor found that these problems can be solved by changing the power unit.

[0062] First Exemplary Embodiment

[0063] The first exemplary embodiment of the present invention provides a power unit for an aerial work platform, which is different from the power unit in the above comparative embodiment in that a single motor controller can not only control the travel motor, but also control the lifting motor, which is equivalent to integrating two motor controllers into one. That is, a motor controller 3 is used to control both the travel motor and the lifting motor in a switching manner, so that the lifting motor does not lift when traveling and does not travel when lifting, which conforms to the unique working state of the aerial work platform. Thus, at least one of the technical effects described in the content of the invention can be achieved.

[0064] Specifically, see Figure 2 The power unit for an aerial work platform provided by the first exemplary embodiment of the present invention includes a travel motor M1, a lifting motor M2 and a single motor controller 3, wherein the motor controller 3 includes a control module 32, a power inverter module 31 for inverting DC power into three-phase adjustable AC power, and a circuit switching module 33. The travel motor M1 and the lifting motor M2 are respectively connected to the control module 32 by signal; the power inverter module 31 can be selectively connected to any one of the travel motor M1 and the lifting motor M2 through the circuit switching module 33.

[0065] When it is necessary to control the aerial work platform to move, firstly, the connection between the power inverter module 31 and the travel motor M1 is realized through the circuit switching module 33, and then the wheel rotation is controlled by the travel motor M1. At this time, the lifting motor M2 is not in action. When the power inverter module 31 inverts the DC power into three-phase adjustable AC power and transmits it to the travel motor M1, the travel motor M1 can drive the entire aerial work platform to move; at the same time, the execution action and operation status of the travel motor M1 can be controlled and monitored through the control module 32, and the specific signal information (such as motor operation status, fault information, etc.) is sent to the vehicle controller (VCU).

[0066] When it is necessary to control the lifting of the aerial work platform, firstly, the connection between the power inverter module 31 and the lifting motor M2 is realized through the circuit switching module 33, and then the lifting mechanism is controlled by the lifting motor M2 to raise / lower the work platform to a suitable working height. At this time, the travel motor M1 is inactive. When the power inverter module 31 inverts the DC power into three-phase adjustable AC power and transmits it to the lifting motor M2, the lifting motor M2 can drive the hydraulic pump in the hydraulic system to rotate and provide power oil to the hydraulic system to drive the lifting mechanism to extend and retract (or the lifting motor M2 drives the electric cylinder to control the lifting of the work platform). At the same time, the execution action and operating status of the lifting motor M2 can be controlled and monitored through the control module 32, and specific signal information (such as motor operating status, fault information, etc.) is sent to the vehicle controller (VCU).

[0067] In some embodiments, the control module 32 may include all circuits and devices in a conventional motor controller except for the power inverter module, including but not limited to a system power supply circuit, an input signal acquisition circuit, a current acquisition circuit, a speed sensor acquisition circuit, a temperature protection circuit, a PWM wave generation circuit, an enable circuit, a fault diagnosis circuit, etc.

[0068] See also Figure 2 In some embodiments, the circuit switching module 31 includes a travel control switch S1 connected to the travel motor M1 and a lifting control switch S2 connected to the lifting motor. During operation, the control module 32 controls the opening and closing of the travel control switch S1 and the lifting control switch S2, so that at most only one of the travel control switch S1 and the lifting control switch S2 is in the on state at the same time. That is, when the travel control switch S1 is in the on state, the lifting control switch S2 is in the off state; when the lifting control switch S2 is in the on state, the travel control switch S1 is in the off state. Thus, the travel action and the lifting action of the whole machine are performed independently of each other.

[0069] In some embodiments, the walking control switch S1 can be selected from any one or any combination of IGBT module, MOSFIT module, relay module, circuit breaker module, etc.; similarly, the lifting control switch S2 can be selected from any one or any combination of IGBT module, MOSFIT module, relay module, circuit breaker module, etc.

[0070] In some embodiments, the control module 32, the power inverter module 31 and the circuit switching module 33 are encapsulated in the same housing. Alternatively, in other embodiments, the control module 32 and the power inverter module 31 may be encapsulated in the same housing, and the circuit switching module 33 may be entirely or at least partially switched outside the housing.

[0071] For details, please refer to Figure 2 In some embodiments, the travel motor M1 includes a first travel motor M 11 and the second travel motor M 12 ; The power inverter module 31 includes a first power inverter module 311 and a second power inverter module 312; the walking control switch S1 includes a first walking motor M 11 The first travel control switch S between the first power module 311 11 (used to move the first travel motor M 11 connected to the first power module 311), and located at the second travel motor M 12 The second travel control switch S between the second power module 312 12 (used to move the second travel motor M 12 Connected to the second power module 312); the control module 32 controls the first travel control switch S11 And the second travel control switch S 12 Synchronous opening and closing to ensure that the first travel motor M 11 and the second travel motor M 12 It is in the start / shutdown state at the same time to ensure the normal movement and stop of the whole machine.

[0072] Correspondingly, the lifting control switch S2 includes a first lifting control switch S 21 And the second lift control switch S 22 . Among them: the first lifting control switch S 21 Set between the first power inverter module 311 and the single lifting motor M2; the second lifting control switch S 22 Set between the second power inverter module 312 and the single lifting motor M2; the control module 32 controls the first lifting control switch S 21 And the second lift control switch S 22 Open and close synchronously to ensure the normal operation of the lifting motor M2.

[0073] See also Figure 2 In some embodiments, the first travel control switch S 11 , Second travel control switch S 12 , First lift control switch S 21 , Second lift control switch S 22 When the aerial work platform is lifting, the control module 32 sends a signal to the first lifting control switch S 21 And the second lift control switch S 22 The first lifting control signal B1 and the second lifting control signal B2 are respectively sent to make the first lifting control switch S 21 And the second lift control switch S 22 The switch state of the first power module 311 is switched from the open state to the closed state, so as to realize the connection between the lifting motor M2 and the first power module 311, and the connection between the lifting motor M2 and the second power module 312. 11 And the second travel control switch S 12 The first walking control signal A1 and the second walking control signal A2 are respectively sent out to make the first walking control switch S 11 And the second travel control switch S 12 The switch state of the first travel motor M is switched from the closed state to the open state, so that the first travel motor M 11 The disconnection between the first power module 311 and the second travel motor M 12 The motor controller 3 can control the lifting motor M2 to operate, while the first travel motor M 11and the second travel motor M 12 No action.

[0074] When the aerial work platform is walking, the signals are opposite, the first walking control signal A1 and the second walking control signal A2 are closed signals, and the first lifting control signal B1 and the second lifting control signal B2 are open signals, thereby realizing the first walking motor M 11 The communication between the first power module 311 and the second travel motor M 12 The connection between the first travel motor M1 and the second power module 312, the disconnection between the lifting motor M1 and the first power module 311, and the disconnection between the lifting motor M2 and the second power module 312. 11 and the second travel motor M 12 action, while the lifting motor M2 does not act.

[0075] Second Exemplary Embodiment

[0076] See also Figure 3 The second exemplary embodiment of the present invention provides a power unit for an aerial work platform, which differs from the power unit in the first exemplary embodiment only in that:

[0077] First travel control switch S 11 And the second travel control switch S 12 Integrated in a travel main switch S 01 In the travel main switch S 01 It comprises at least six travel switch units arranged in parallel and opened and closed synchronously, wherein three travel switch units constitute the first travel control switch S 11 The other three travel switch units constitute the second travel control switch S 12 ; The travel main switch S 01 The signal is connected to the control module 32 to control the first travel control switch S through the control module 32 11 And the second travel control switch S 12 Synchronous opening and closing;

[0078] and / or,

[0079] First lift control switch S 21 And the second lift control switch S 22 Integrated in a lift master switch S 02 In the lifting master switch S 02 It comprises at least six lifting switch units arranged in parallel and opened and closed synchronously, wherein three lifting switch units constitute a first lifting control switch S 21 The other three lifting switch units constitute the second lifting control switch S 22; The lifting master switch S 02 The signal is connected to the control module 32 to control the first lifting control switch S through the control module 32 21 And the second lift control switch S 22 Synchronous opening and closing.

[0080] When the aerial work platform is lifting, the motor controller 3 sends a signal B to the lifting main switch S 02 At this time, the integrated setting is the lifting main switch S 02 The first lift control switch S 21 And the second lift control switch S 22 The motor controller 3 sends a signal A to the main travel switch S 01 At this time, the integrated setting is on the travel main switch S 01 The first travel control switch S 11 And the second travel control switch S 12 Switching from the closed state to the open state, thereby realizing the first travel motor M 11 The disconnection between the first power module 311 and the second travel motor M 12 The motor controller 3 can control the lifting motor M2 to operate, while the first travel motor M 11 and the second travel motor M 12 No action.

[0081] When the aerial work platform is moving, the signal is opposite. At this time, the integrated setting is the lifting main switch S 02 The first lift control switch S 21 And the second lift control switch S 22 Switching from the closed state to the open state realizes the disconnection between the lifting motor M2 and the first power module 311, and the disconnection between the lifting motor M2 and the second power module 312. At the same time, the integrated walking main switch S 01 The first travel control switch S 11 And the second travel control switch S 12 Switching from the open state to the closed state, thereby realizing the first travel motor M 11 The communication between the first power module 311 and the second travel motor M 12 The first travel motor M can be controlled by the motor controller 3 at this time. 11 and the second travel motor M 12 action, while the lifting motor M2 does not act.

[0082] Third Exemplary Embodiment

[0083] See also Figure 4 The third exemplary embodiment of the present invention provides a power unit for an aerial work platform, which differs from the power unit in the first exemplary embodiment only in that:

[0084] First travel control switch S 11 , Second travel control switch S 12 , First lift control switch S 21 And the second lift control switch S 22 Integrated in a main switch S0, and:

[0085] First travel control switch S 11 And the second travel control switch S 12 The first contact point of the main switch S0 is connected to the 001 , the first contact connection position S 001 At least six switch units are arranged in parallel and opened and closed synchronously;

[0086] First lift control switch S 21 And the second lift control switch S 22 The second contact point of the main switch S0 is connected to the 002 , the second contact connection position S 002 It comprises at least six switch units which are arranged in parallel and opened and closed synchronously.

[0087] Specifically, the switching main switch S0 can be a single-pole double-throw switch, which switches between two contacts, that is, there is a normally closed state, and one of the walking circuit and the lifting circuit is connected under normal conditions. It can also be a single-pole three-throw switch, that is, there is a normally open state. When it is in the normally open state, its switching mechanism is connected to the first contact on both sides. 001 , the second contact connection position S 002 None are connected.

[0088] When the aerial work platform is walking, the control module 32 switches the state of the main switch S0 to the walking circuit is turned on, and the switching mechanism in the main switch S0 is in the first contact connection position S 001 At this time, the first travel motor M 11 Connected to the first power module 311, the second travel motor M 12 The first power module 311 and the second power module 312 are both disconnected from the lifting motor M2. Thus, the motor controller 3 can control the first travel motor M 11 and the second travel motor M 12 action, while the lifting motor M2 does not act.

[0089] When the aerial work platform performs a lifting action, the control module 32 switches the state of the main switch S0 to the lifting circuit being turned on, and the switching mechanism in the main switch S0 is switched to the second contact connection position S 002 At this time, the first power module 311 and the second power module 312 are both connected to the lifting motor M2; the first travel motor M 11 The first power module 311 is disconnected, and the second travel motor M 12 The second power module 312 is disconnected. Thus, the motor controller 3 can control the lifting motor M2 to operate, while the first travel motor M 11 and the second travel motor M 12 No action.

[0090] Fourth Exemplary Embodiment

[0091] See also Figure 5 , the fourth exemplary embodiment of the present invention provides an aerial work platform, which includes a base, a lifting mechanism, a work platform and a vehicle controller 4, wherein the two ends of the lifting mechanism are respectively connected to the base and the work platform. The aerial work platform may also include other controllers 5, which may be a handle, a central console, etc. The other controllers 5 interact with the vehicle controller VCU4 through CAN signals. The aerial work platform also includes a power unit provided in any of the above embodiments, and the motor controller 3 in the power unit receives a signal from the vehicle controller 4, and controls the walking motor M1 and the lifting motor M2 in a switchable manner through the circuit switching module 33, so that at the same time, at most only one of the walking motor and the lifting motor is in a working state.

[0092] In summary, the power unit and aerial work platform provided by the above exemplary implementation have at least the following advantages compared with the comparative embodiment:

[0093] a) It can reduce costs. From the traditional independent purchase and adaptation of the travel motor assembly and the lifting assembly to the purchase and adaptation of the integrated assembly such as a single motor controller 3, it can reduce the material cost, labor cost, and time cost caused by incompatibility and performance defects caused by various reasons of the supplier.

[0094] b) The use of a single integrated motor controller 3 can reduce the installation of one controller, thereby saving installation space in the equipment installation bin, and can better plan the wiring of the installation bin, making replacement and maintenance more convenient and quick; and can simplify the installation process.

[0095] c) The integration of the controller has been improved, which is conducive to unifying the hardware detection and software protocols of the travel motor and the lifting motor, achieving more accurate fault diagnosis, better user experience, and faster and more worry-free maintenance experience.

[0096] d) It is helpful to reduce the installation process and testing process and time required by the main engine factory, and reduce labor costs and time costs.

[0097] d) Since a single motor controller 3 is used to control the actuators of the walking unit and the lifting unit, the hardware detection and software protocol can be unified, and the conventional fault reporting can be upgraded to knowing where the fault is reported, thus bringing a new user experience, reducing the tedious manual line inspection and maintenance after the problem occurs, and being able to perform fault diagnosis more accurately, accurately locate the fault point, reduce maintenance time, improve usage efficiency, and enhance the durability and reliability of the entire vehicle system.

[0098] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed.

[0099] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0100] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power unit for an aerial work platform, characterized in that: The invention comprises a walking motor (M1), a lifting motor (M2) and a single motor controller (3), wherein the motor controller (3) comprises a control module (32), a power inverter module (31) for inverting direct current into three-phase adjustable alternating current, and a circuit switching module (33), wherein the circuit switching module (33) can selectively connect the power inverter module (31) to any one of the walking motor (M1) and the lifting motor (M2).

2. The power unit according to claim 1, characterized in that: The circuit switching module (31) comprises a walking control switch (S1) connected to the walking motor (M1) and a lifting control switch (S2) connected to the lifting motor. During operation, the control module (32) controls the opening and closing of the walking control switch (S1) and the lifting control switch (S2) so that at most only one of the two is in an on state at the same time.

3. The power unit according to claim 1, characterized in that: The walking control switch (S1) and the lifting control switch (S2) are selected from any one or any combination of an IGBT module, a MOSFIT module, a relay module, and a circuit breaker module.

4. The power unit according to claim 1, characterized in that: The control module (32), the power inverter module (31) and the circuit switching module (33) are encapsulated in the same housing; or, the control module (32) and the power inverter module (31) are encapsulated in the same housing, and the circuit switching module (33) is located outside the housing.

5. The power unit according to claim 2, characterized in that: The travel motor (M1) comprises a first travel motor (M 11 ) and the second travel motor (M 12 ); The power inverter module (31) comprises a first power inverter module (311) and a second power inverter module (312); The travel control switch (S1) includes the first travel motor (M 11 ) is connected to a first travel control switch (S 11 ) and the second travel motor (M 12 ) is connected to a second travel control switch (S 12 ); The control module (32) controls the first travel control switch (S 11 ) and the second travel control switch (S 12 )Synchronous opening and closing.

6. The power unit according to claim 5, characterized in that: The lifting control switch (S2) comprises a first lifting control switch (S 21 ) and the second lift control switch (S 22 ),in: The first lifting control switch (S 21 ) is arranged between the first power inverter module (311) and the single lifting motor (M2); The second lifting control switch (S 22 ) is arranged between the second power inverter module (312) and the single lifting motor (M2); The control module (32) controls the first lifting control switch (S 21 ) and the second lift control switch (S 22 )Synchronous opening and closing.

7. The power unit according to claim 6, characterized in that: The first travel control switch (S 11 ) and the second travel control switch (S 12 ) integrated in a travel master switch (S 01 ), the travel master switch (S 01 ) comprises at least six travel switch units arranged in parallel and opened and closed synchronously, wherein three of the travel switch units constitute the first travel control switch (S 11 ), the other three travel switch units constitute the second travel control switch (S 12 ); the walking master switch (S 01 ) is connected to the control module (32) by signal; and / or, The first lifting control switch (S 21 ) and the second lift control switch (S 22 ) integrated in a lift master switch (S 02 ), the lifting master switch (S 02 ) comprises at least six lifting switch units arranged in parallel and opened and closed synchronously, wherein three of the lifting switch units constitute the first lifting control switch (S 21 ), the other three lifting switch units constitute the second lifting control switch (S 22 ); the lifting master switch (S 02 ) is signal-connected to the control module (32).

8. The power unit according to claim 2, characterized in that: The travel control switch (S1) and the lifting control switch (S2) are integrated in a single switching switch (S0), and are respectively the first contact connection position and the second contact connection position of the switching switch (S0).

9. The power unit according to claim 8, characterized in that: The travel motor (M1) comprises a first travel motor (M 11 ) and the second travel motor (M 12 ), the power inverter module (31) includes a first power inverter module (311) and a second power inverter module (312), and the circuit switching module (33) includes a first travel motor (M 11 ) is connected to a first travel control switch (S 11 ) and the second travel motor (M 12 ) is connected to a second travel control switch (S 12 ); The lifting control switch (S2) comprises a first lifting control switch (S2) arranged in parallel between the first power inverter module (311), the second power inverter module (312) and the single lifting motor (M2). 21 ) and the second lift control switch (S 22 ); The first travel control switch (S 11 ) and the second travel control switch (S 12 ) constitutes the first contact connection position; The first lifting control switch (S 21 ) and the second lift control switch (S 22 ) constitutes the second contact connection position.

10. An aerial work platform, comprising a base, a lifting mechanism, a working platform and a vehicle controller (4), wherein two ends of the lifting mechanism are respectively connected to the base and the working platform, and characterized in that: It also comprises the power unit according to any one of claims 1 to 9, wherein the motor controller (3) receives a signal from a vehicle controller (4) and controls the travel motor (M1) and the lifting motor (M2) in a switchable manner.

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