Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a system for testing the comprehensive performance of a driverless vehicle. The system comprises a foundation platform (1), a lateral movement platform (2) mounted on the foundation platform (1), and a revolving platform (3) mounted on the lateral movement platform (2), wherein the foundation platform (1) is provided with a lateral movement guide rail (11) for guiding the lateral movement platform (2) to slide left and right, and a lateral movement electric motor for driving the lateral movement platform (2) to slide left and right; two front wheel supports (6) capable of sliding left and right, and a front wheel distance adjusting mechanism (91) are arranged on a front portion of the revolving platform (3); two rear wheel supports (8) capable of sliding forwards and backwards, and an axle distance adjusting mechanism (92) are arranged on a rear portion of the revolving platform (3); each of the front wheel supports (6) is provided with a front wheel drum frame (7) capable of rotating horizontally; each front wheel drum frame (7) is provided with a front wheel drum (4), and a front wheel load electric motor for driving the rotation of the front wheel drum (4); and each of the rear wheel supports (8) is provided with a rear wheel drum (5), and a rear wheel load electric motor for driving the rotation of the rear wheel drum (5). The system can test the longitudinal and lateral performance of a driverless vehicle.
A: A foldable stroller, comprising a front wheel support (1), a rear wheel support (2), a middle support (3), a front support (4), a push rod (5), a rear supporting rod (6), a seat rod (7) and a basket rod (8); the front wheel support (1), the front support (4) and the basket rod (8) are connected to be in a mutually rotatable relationship; the front end of the middle support (3) is movably connected to the front wheel support (1); the rear wheel support (2), the rear supporting rod (6) and the rear end of the middle support (3) are connected to be in a mutually rotatable relationship; the basket rod (8) is movably connected to the rear wheel support (2); the front support (4) is movably connected to the push rod (5) and the seat rod (7) respectively; the push rod (5) is movably connected to the rear supporting rod (6); and the seat rod (7), the rear supporting rod (6) and the rear end of the middle support (3) are connected to be in a mutually rotatable relationship.
B: A smart car vehicle-in-the-loop test system comprising: a drum platform (1) used for conducting simulation tests of the longitudinal movement of a vehicle; an environment sensing platform (2) installed on the front end of the drum platform (1) which is used for conducting simulation tests of the lateral movement of the vehicle and comprises a support base (10) as a lower part and an vehicle placement platform (7) as an upper part, lateral driving wheels (11) being installed in the lower part of the support base (10), said lateral driving wheels (11) moving along a lateral track (12) disposed on the ground; and a target vehicle simulation unit disposed at the periphery of the environment sensing platform (2) and used for simulating a target vehicle. The environment sensing platform (2) is capable of lateral movement, and thus can conduct simulation tests of test scenarios in which a vehicle changes route or changes lanes, can test yawing, pitching and rolling motions of a vehicle in a way that is more true to such processes in reality, and can conduct a simulation test of a dangerous oncoming traffic scenario for a vehicle. The platform also provides a mechanism for reproducing the true steering resistance moment of a vehicle when the vehicle changes direction, causing a vehicle steering operation to have the correct response speed.
C: A foldable stroller frame, comprising: a front wheel support frame (1), a rear wheel support frame (2) rotatably connected to the front wheel support frame (1), a side handrail (3) rotatably connected to the rear wheel support frame (2), a rear bracing rod (5) rotatably connected to the rear wheel support frame (2) at a first position of the rear wheel support frame (2), a push rod (4) connected to the side handrail (3) and the rear bracing rod (5) so as to rotate on different axes, a sliding sleeve (8) disposed on the rear wheel support frame (2), and a front wheel support frame connecting rod (6), a first end of said front wheel support frame connecting rod (6) being rotatably connected to the sliding sleeve (8), and a second end of the front wheel support frame connecting rod (6) being rotatably connected to the front wheel frame (1); and a side handrail connecting rod (7), a first end of said side handrail connecting rod (7) being rotatably connected to the sliding sleeve (8), and a second end of the side handrail connecting rod (7) being rotatably connected to the side handrail (3).
D: A three-wheel scooter, provided with a front wheel support member (4) between the two front wheels; bearings (5, 6) are disposed respectively above and below the central hole of the front wheel support member (4); the bearings (5, 6) are provided with a double-threaded shaft (7) therein; the double-threaded shaft (7) uses two nuts (8, 9) to lock a stop collar (10) and the front portion of a pedal (3) to the front wheel support member (4); the top of the double-threaded shaft (7) is connected to a handle tube (11) via the pedal (3), and the top of the handle tube (11) is provided with a handlebar (12); behind the pedal (3) is provided a rear wheel (13); a torsion spring (14) is provided between the front wheel support member (4) and the stop collar (10), and is sleeved on the double-threaded shaft (7), with the two ends of the torsion spring (14) being respectively connected to the front wheel support member (4) and the stop collar (10); the torsion spring (14) sets the initial angle of the axle line of the front wheel support member (4) to be parallel to the axle line of the rear wheel (13); a rotary stopping boss (4c) is provided around the central hole of the front wheel support member (4); a corresponding rotary stop recess (10b) is provided in the stop collar (10); and the rotary stop boss (4c) is inserted into the rotary stop recess (10b). The three-wheel scooter provides automatic steering return, and has good storage stability and convenience.
Answer: B