Speed ​​change mechanism of integrated electric drive system for buses

Abstract

The present invention discloses a speed change mechanism of an integrated electric drive system for a passenger car, and relates to the technical field of electric vehicles. The speed change mechanism comprises a vehicle-mounted battery pack, a load motor and a vehicle start switch, wherein a speed change device is connected in series in a loop formed by the vehicle-mounted battery pack, the load motor and the vehicle start switch, and the input end of the speed change device is controlled by a vehicle power pedal, and the load motor is connected to the vehicle wheel transmission with a fixed gear ratio. The speed change device comprises a drive disc, a rotating wheel and a pressure speed regulating mechanism. By connecting the speed change device in series to a loop formed by the vehicle-mounted battery pack, the load motor and the vehicle start switch, and generating a current in the opposite direction after starting, thereby controlling the power of the load motor, this speed change method can effectively solve the potential safety hazard of inconsistency of the traditional CAN bus when the electric vehicle changes speed.

Description

Technical Field

[0001] The invention relates to the technical field of electric vehicles, in particular to a speed change mechanism of an integrated electric drive system for a passenger car. Background Art

[0002] In recent years, electric vehicles have attracted the attention of various automobile developers due to their energy-saving, environmental protection and high energy conversion rate. Compared with traditional fuel-powered vehicles, the electric drive system has a very high torque after powering on, so the gearbox structure of traditional fuel vehicles is abandoned, and a more direct transmission method is obtained, which greatly improves the energy conversion rate of the vehicle.

[0003] In an electric car, the driver presses the accelerator pedal, and the sensor detects the movement of the pedal. This value is transmitted to the electronic control system. When the electronic control system sends a command to the motor controller, the motor controller calculates various indicators of the motor and controls the motor to work.

[0004] When the accelerator pedal is pressed lightly, the discharge current of the battery is small. When the accelerator pedal is pressed hard, the discharge current of the battery will be very large. Thus, the speed of the motor is changed to achieve the purpose of speed change. However, such a speed change mechanism will be overly dependent on the work of sensors and electronic control systems. Traditional electric vehicles generally use CAN bus to transmit data information, but there are inconsistencies in CAN bus. CAN bus 2 OA stipulates in information authentication: The range of transmitter error detection can cover the end of the frame. If an error is found, it will be retransmitted according to the priority and status regulations in the future; The range of receiver error detection covers the previous bit of the end of the frame. Therefore, if due to spatial interference, power supply fluctuations and other reasons, for the penultimate bit of the frame, some nodes A think there is no error, and some nodes B think there is an error, that is, the so-called Byzantine error occurs. At this time, the root EOF should be 7 recessive bits. Node B thinks this is a formal error, so it will start the error frame, notify the transmitter to retransmit, and discard the received frame. Node A, which thinks it is wrong, will receive this frame because it only finds the penultimate bit. If the retransmission notified by B is successful before the next routine transmission of the transmitter, A will receive a duplicate frame; if the retransmission is unsuccessful, B will lose a frame. In the steering and braking system, the different understanding of the command by the four wheels may cause performance degradation or other more serious consequences. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a speed change mechanism for an integrated electric drive system for a bus, which solves the problems raised in the background art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a speed change mechanism of an integrated electric drive system for a passenger car includes an on-board battery pack, a load motor and a vehicle starting switch, a speed change device is connected in series in a loop consisting of the on-board battery pack, the load motor and the vehicle starting switch, the input end of the speed change device is controlled by a vehicle power pedal, and the load motor is connected to the vehicle wheel with a fixed gear ratio.

[0007] The speed changing device comprises a driving disc, a rotating wheel and a pressure speed regulating mechanism, wherein

[0008] The rotating wheel is in the shape of a hollow ring, and an arc-shaped magnet is fixed on the side wall of the rotating wheel. A coil is arranged on the outside of the rotating wheel. The rotating wheel passes through the coil and does not contact the inner wall of the coil. The two ends of the coil are connected to a circuit consisting of an on-board battery pack, a load motor and a car start switch through wires, and are arranged in a toothed manner on the outer side of the curved surface of the rotating wheel.

[0009] The curved surface of the driving disk meshes with the outer side of the curved surface of the rotating wheel. The output shaft of the servo motor passes through the center of the driving disk and is fixed to the driving disk. The servo motor is turned on and off by the car start switch, and the servo motor is powered by the vehicle battery pack.

[0010] The pressure speed regulating mechanism includes a shell movably installed at the center of a circle on one side of a driving disk and a rotating element sleeved on the outer surface of the output shaft of a servo motor. The rotating element is fixedly connected to the output shaft of the servo motor, and a protrusion is provided on the curved surface of the rotating element. A sliding portion is provided on the shell, and a slider is slidably installed inside the sliding portion. One side of the slider is connected to one end of a pressure rod, and the other end of the pressure rod is connected to a power pedal of a car. The other side of the slider is connected to a pressure block through an elastic element, and an extrusion component is provided on one side of the pressure block.

[0011] Preferably, the extrusion component and the protrusion are both arranged in a hemispherical shape.

[0012] Preferably, a support mechanism is provided at the center of the rotating wheel, and the support mechanism comprises a fixing portion, on which two supporting legs are fixed, and free ends of the supporting legs are in contact with the inner wall of the rotating wheel.

[0013] Preferably, a roller is provided on the free end of the support leg, a groove is provided on the curved surface of the roller, and a flange is provided on the inner wall of the rotating wheel, and the flange is inserted into the groove of the roller.

[0014] Preferably, the number of the arc-shaped magnets is at least four and they are arranged in a circular shape and at equal distances on the side wall of the arc-shaped magnet.

[0015] Preferably, the N pole of the arc-shaped magnet is located in the counterclockwise direction of the S pole, and the servo motor rotates in the clockwise direction, and the input end of the speed change device is electrically connected to the positive pole of the vehicle-mounted battery pack.

[0016] Preferably, the speed change device is connected to the amplifier circuit wires, and the maximum current after amplification by the amplifier circuit is equal to and opposite in direction to the current of the vehicle-mounted battery pack, and the voltage values ​​are opposite to each other.

[0017] The present invention provides a speed change mechanism for an integrated electric drive system for a passenger car, which has the following beneficial effects:

[0018] (1) The speed change mechanism of the integrated electric drive system connects the speed change device in series to a circuit consisting of an on-board battery pack, a load motor and a vehicle start switch, and generates current in the opposite direction after starting, thereby controlling the power of the load motor. This speed change method can effectively solve the safety hazard problem of inconsistency in the traditional CAN bus when changing speed in electric vehicles.

[0019] (2) The speed change mechanism of the integrated electric drive system is provided by the cooperation of the drive disc, the rotating wheel and the speed regulating mechanism. The drive disc is connected to the servo motor and is driven by the servo motor to rotate, thereby driving the rotating wheel to rotate. When the rotating wheel rotates, the magnet passes through the coil, thereby generating a current in the opposite direction to the vehicle-mounted battery pack, thereby controlling the power of the load motor, and further achieving the purpose of speed change. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the speed change device of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the rotating wheel of the present invention.

[0023] Figure 4 It is a cross-sectional view of the speed regulating mechanism of the present invention.

[0024] In the figure: 1 speed change device, 101 drive plate, 102 rotating wheel, 103 speed regulating mechanism, 1031 housing, 1032 rotating element, 1033 protrusion, 1034 sliding part, 1035 slider, 1036 pressure rod, 1037 elastic element, 1038 pressure block, 1039 extrusion component, 2 arc magnet, 3 coil, 4 servo motor, 5 support mechanism, 501 fixing part, 502 support foot, 503 roller. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] See also Figure 1 The present invention provides a technical solution: a speed change mechanism of an integrated electric drive system for a bus includes a vehicle-mounted battery pack, a load motor and a vehicle start switch, a speed change device 1 is connected in series in a loop composed of the vehicle-mounted battery pack, the load motor and the vehicle start switch, an input end of the speed change device 1 is controlled by a vehicle power pedal, and the load motor is connected to the vehicle wheel with a fixed gear ratio.

[0028] After the car is turned on by the car start switch, the load motor, the vehicle battery pack and the speed change device 1 are connected in series to a closed return wheel. In this return wheel, the speed change device 1 will generate a current equal to and opposite to the current of the vehicle battery pack, so that the current in the circuit is 0, and the potential difference between any two points in the entire circuit is also 0. At this time, the load motor has no way to work. Therefore, the car will not move forward after starting. By changing the current and voltage of the speed change device 1, the current in the entire series circuit is changed, and the power of the load motor is further changed, so as to achieve the purpose of speed change.

[0029] like Figure 2-4 As shown, the speed change device 1 is composed of a driving disc 101 , a rotating wheel 102 and a pressure speed regulating mechanism 103 .

[0030] The rotating wheel 102 is in the shape of a hollow ring, and a supporting mechanism 5 is arranged at the center of the rotating wheel 102. The supporting mechanism 5 includes a fixing portion 501, and two legs 502 are fixed on the fixing portion 501. The free ends of the legs 502 are in contact with the inner wall of the rotating wheel 102, and a roller 503 is arranged on the free end of the legs 502. A groove is provided on the curved surface of the roller 503, and a flange is provided on the inner wall of the rotating wheel 102. The flange is inserted into the groove of the roller 503, and an arc magnet 2 is fixed on the side wall of the rotating wheel 102. The number of the arc magnets 2 is at least not less than four, and they are arranged in a circular shape and at equal distances on the side wall of the arc magnet 2. A coil 3 is arranged on the outside of the rotating wheel 102, and the rotating wheel 102 passes through the coil 3 and does not contact the inner wall of the coil 3. The two ends of the coil 3 are connected to a circuit composed of a vehicle-mounted battery pack, a load motor and a vehicle start switch through a wire, and are arranged in a toothed manner on the outer side of the curved surface of the rotating wheel 102.

[0031] The curved surface of the driving disk 101 meshes with the outer side of the curved surface of the rotating wheel 102, the output shaft of the servo motor 4 passes through the center of the driving disk 101 and is fixed to the driving disk 101, and the servo motor 4 is turned on and off by the car start switch, and the servo motor 4 is powered by the vehicle battery pack.

[0032] The pressure speed regulating mechanism 103 comprises a housing 1031 movably mounted at the center of one side of the driving disk 101 and a rotating element 1032 sleeved on the outer surface of the output shaft of the servo motor 4. The rotating element 1032 is fixedly connected to the output shaft of the servo motor 4, and a protrusion 1033 is arranged on the curved surface of the rotating element 1032. A sliding portion 1034 is arranged on the housing 1031, and a slider 1035 is slidably installed inside the sliding portion 1034. One side of the slider 1035 is connected to one end of a pressure rod 1036, and the other end of the pressure rod 1036 is connected to the power pedal of the car. The other side of the slider 1035 is connected to a pressure block 1038 through an elastic element 1037, and one side of the pressure block 1038 is provided with a pressing component 1039. The pressing component 1039 and the protrusion 1033 are both arranged in a hemispherical shape.

[0033] In this embodiment, the N pole of the arc magnet 2 is located in the counterclockwise direction of the S pole, and the servo motor 4 rotates in the clockwise direction, and the input end of the speed change device 1 is electrically connected to the positive pole of the vehicle battery pack. The speed change device is connected to the amplifier circuit wire, and the maximum current after amplification by the amplifier circuit is equal to the current of the vehicle battery pack and the direction is opposite, and the voltage values ​​are opposite to each other. At the same time, in this embodiment, the servo motor 4 is powered by an independent power supply, and the vehicle start switch controls the opening and closing of the servo motor 4 at the same time.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A speed change mechanism of an integrated electric drive system for a passenger car, comprising an on-board battery pack, a load motor and a car start switch, Features: A speed change device (1) is connected in series in a circuit consisting of the vehicle-mounted battery pack, the load motor and the vehicle start switch, the input end of the speed change device (1) is controlled by a vehicle power pedal, and the load motor is drivingly connected to the vehicle wheels with a fixed gear ratio; The speed change device (1) comprises a drive disc (101), a rotating wheel (102) and a pressure speed regulating mechanism (103), wherein the rotating wheel (102) is in the shape of a hollow ring, and an arc-shaped magnet (2) is fixed on the side wall of the rotating wheel (102), a coil (3) is arranged on the outside of the rotating wheel (102), the rotating wheel (102) passes through the coil (3) and does not contact the inner wall of the coil (3), and the two ends of the coil (3) are connected to a circuit consisting of an on-board battery pack, a load motor and a car start switch through a wire, and are arranged in a toothed manner on the outer side of the curved surface of the rotating wheel (102); The curved surface of the driving disk (101) meshes with the outer side of the curved surface of the rotating wheel (102); the output shaft of the servo motor (4) passes through the center of the driving disk (101) and is fixed to the driving disk (101); the servo motor (4) is turned on and off by a start switch of the vehicle, and the servo motor (4) is powered by a vehicle-mounted storage battery pack; The pressure speed regulating mechanism (103) comprises a housing (1031) movably mounted at the center of a circle on one side of the driving disk (101) and a rotating element (1032) sleeved on the outer surface of the output shaft of the servo motor (4); the rotating element (1032) is fixedly connected to the output shaft of the servo motor (4); a protrusion (1033) is provided on the curved surface of the rotating element (1032); a sliding portion (1034) is provided on the housing (1031); a slider (1035) is slidably mounted inside the sliding portion (1034); one side of the slider (1035) is connected to one end of a pressure rod (1036); the other end of the pressure rod (1036) is connected to a power pedal of a vehicle; the other side of the slider (1035) is connected to a pressure block (1038) via an elastic element (1037); and one side of the pressure block (1038) is provided with a pressing component (1039); The extrusion component (1039) and the protrusion (1033) are both arranged in a hemispherical shape; A support mechanism (5) is provided at the center of the rotating wheel (102), the support mechanism (5) comprising a fixing portion (501), two supporting legs (502) being fixed on the fixing portion (501), and free ends of the supporting legs (502) being in contact with the inner wall of the rotating wheel (102); A roller (503) is provided on the free end of the support foot (502); a groove is provided on the curved surface of the roller (503); a flange is provided on the inner wall of the rotating wheel (102); the flange is inserted into the groove of the roller (503); The number of the arc-shaped magnets (2) is at least four and they are arranged in a circular shape at equal distances on the side wall of the arc-shaped magnet (2); The N pole of the arc-shaped magnet (2) is located in the counterclockwise direction of the S pole, and the servo motor (4) rotates in the clockwise direction, and the input end of the speed change device is electrically connected to the positive pole of the vehicle-mounted battery pack; The speed change device (1) is connected to the amplifier circuit wire, and the maximum current after amplification by the amplifier circuit is equal to and opposite in direction to the current of the vehicle-mounted battery pack, and the voltage values ​​are opposite to each other.

Images