Please select the most similar patent number from A, B, C and D. Which number is?
A fully electric scissor-type aerial work platform, comprising a lifting unit (31), a walking unit (33), a steering unit (32) and a control unit. The lifting unit (31) comprises a lifting adjusting assembly. The walking unit (33) comprises an electric driving component (23). The steering unit (32) comprises an electric steering control component (21). The control unit comprises a whole machine controller (26), a lifting unit sensor used for collecting height and speed information of a work platform (1), and a steering unit sensor used for collecting steering angle information of the work platform (1). The lifting unit sensor, the steering unit sensor, an electric lifting control component (4), the electric steering control component (21) and the electric driving component (23) are all connected to the whole machine controller (26). The whole machine is fully electrically driven, and there is no hydraulic system involved, thereby solving the problems that an electro-hydraulic driving system of an existing scissor-type aerial work platform has a low electric energy utilization rate, the risk of hydraulic oil leakage and high maintenance costs, and achieving, by means of an efficient electric energy utilization rate of an electric motor, the aims of reducing the installed capacity of a whole machine battery and reducing the manufacturing and maintenance costs for the whole machine.
A: A distributed four-wheel-drive pure electric platform, comprising: an electric energy system, comprising a battery control module (11), a power battery (12), a voltage regulation module (13), two sets of batteries (14) and two sets of junction boxes (15); a power system, comprising a vehicle control module (21), and four sets of wheel hub motors (22) connected to the power battery (12); a braking system, comprising a brake control module (31), and four sets of brake motors (32) connected to the power battery (12); and a steering system, comprising a steering control module (41), and four sets of steering gears (42) connected to the power battery (12). Also provided is a control method for the distributed four-wheel-drive pure electric platform. The distributed four-wheel-drive pure electric platform achieves the braking of the distributed four-wheel-drive pure electric platform, and improves the safety of the distributed four-wheel-drive pure electric platform.
B: Disclosed is an amplitude limiting system of an insulated aerial work platform. The insulated aerial work platform (1) comprises a telescopic arm (11), an insulated foldable arm (12) and a telescopic supporting leg (13); an amplitude-variable oil cylinder (2) is installed between the telescopic arm (11) and the insulated foldable arm (12); a first pressure sensor (3) is connected to an oil pressure cavity (21) of the amplitude-variable oil cylinder (2), and is electrically connected to a controller (8) through signals; a balance valve (4) is provided on the amplitude-variable oil cylinder (2); a reversing valve (5) is connected to the balance valve (4); and a flow meter (6) is connected in series between a directional control valve (5) and the balance valve (4), and is electrically connected to the controller (8) through signals. The amplitude limiting system of the insulated aerial work platform is capable of precisely limiting the amplitude without the need for placing electrical components on the telescopic arm of the insulated aerial work platform, thereby improving the safety of aerial work.
C: A multifunctional test bench for a power split hydraulic mechanical composite transmission system, comprising a platform (19) and a control system. An alternating current servomotor (1), a flow splitting mechanism (2), a hydraulic transmission unit (3) to be tested, a flow combination mechanism (4), and a hydraulic loading system (5) are provided on the platform (19); the control system comprises an industrial control computer (33), a PLC (32), an input end PLC D/A module (31), an output end PLC D/A module (39), a signal acquisition unit (36), a pressure sensor (42), a flow sensor (41), a speed regulation controller (38), a loading system controller (40), and a servomotor controller (30). Performance test of a hydraulic mechanical composite transmission system can be simply and reliably carried out, test time and costs can be greatly reduced, and performance test of the hydraulic transmission unit (3) to be tested, the ratio test of mechanical and hydraulic power flows, and the stage switching stability test are implemented.
D: An automatic steering device of an agricultural machine, the device is connected to a steering axle of the agricultural machine and comprises a data acquisition unit (1) used for acquiring agricultural machine data information, wherein the agricultural machine data information comprises an actual steering angle value, a driving position, and a driving direction of the agricultural machine; a driving unit (2) used for providing rotating torque; a steering unit (3) connected to the driving unit (2) and the steering axle and used for transferring the rotating torque to the steering axle; and a control unit (4) connected to the data acquisition unit (1) and the driving unit (2) and used for obtaining the steering angle value according to the agricultural machine data information and controlling the driving unit (2) according to the steering angle value. The automatic steering device of the agricultural machine is simple in structure, capable of being used for agricultural machines with different steering angle ranges, high in efficiency and easy to operate.
Answer: B