Long-stator road, electric vehicle, traffic system and control method of traffic system

Abstract

The invention provides a long-stator road, an electric vehicle, a traffic system and a control method of the traffic system, and belongs to the technical field of electric vehicles. The long stator road comprises a long stator lane; a linear motor long stator and a power supply are laid under the road surface of the long stator lane; the power supply is connected with the three-phase winding and is used for providing three-phase alternating current for the linear motor long stator; the linear motor long stator is composed of an iron core and a three-phase winding and is used for forming a doubly-fed linear motor with a vehicle-mounted rotor inside an electric vehicle running on a long stator lane under the action of three-phase alternating current, and power is supplied to the electric vehicle through magnetic field interaction. The ground long stator winding transmits electric energy to a vehicle-mounted winding of the electric vehicle, supplies power to a vehicle-mounted electric appliance or charges a battery, and enables the electric vehicle to endlessly run. In the mode, the electric automobile runs at the same constant speed, and the problem that rear-end collision accidents are likely to happen during emergency braking due to the fact that the following distance of the automobile is too small is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a long stator highway, an electric vehicle, a transportation system, and a control method for the transportation system. Background Art

[0002] As the number of electric vehicles continues to rise, the problems of limited range and difficulty in charging faced by electric vehicles are becoming increasingly prominent. The three existing solutions all have defects. The first is to use plug-in hybrid technology, and to solve the range problem by refueling when traveling long distances. In this case, it is no different from a fuel vehicle, and the advantages of electric vehicles being clean and emission-free are not brought into play. The second is to increase battery capacity and adopt fast charging technology to relatively increase the range and shorten the charging time. However, when the volume and energy density of the on-board battery are limited, the range that can be improved is limited. Fast charging technology can only shorten the charging time but cannot improve the range. The third is to use battery replacement to improve the range, but its disadvantage is that it is overly dependent on the construction of battery swap stations. Range is still a major problem hindering the development of the electric vehicle industry. Summary of the invention

[0003] The present application provides a long stator road, an electric vehicle, a traffic system and a control method of the traffic system, which can charge the battery during driving through a dual-feed cruise mode, achieve unlimited endurance of the electric vehicle, and ensure constant speed driving, thereby solving the problem of rear-end collisions caused by sudden braking. The technical solution is as follows:

[0004] On the one hand, an embodiment of the present application provides a long stator road, wherein the long stator road comprises a long stator lane;

[0005] A linear motor long stator and a power supply are laid under the road surface of the long stator lane;

[0006] The power supply is connected to the three-phase winding and is used to provide three-phase alternating current to the long stator of the linear motor;

[0007] The long stator of the linear motor is composed of an iron core and the three-phase winding, and is used to form a double-fed linear motor with the on-board mover inside the electric vehicle traveling on the long stator lane under the action of the three-phase alternating current, and power the electric vehicle through magnetic field interaction. The long stator of the linear motor has the same winding pole pitch as the on-board mover.

[0008] On the other hand, an embodiment of the present application provides an electric vehicle, wherein the electric vehicle is provided with an on-board mover, an on-board bidirectional inverter, an on-board storage battery, and an electric drive and a rotating motor;

[0009] The vehicle-mounted mover is composed of an iron core and a three-phase winding, and is used to form a double-fed linear motor with a long stator of a linear motor in a long stator lane, and the long stator of the linear motor has the same winding pole pitch as the vehicle-mounted mover;

[0010] The AC end of the vehicle-mounted bidirectional inverter is connected to the three-phase winding of the vehicle-mounted mover, and the DC end is connected to the DC circuit, so as to convert the AC power output by the double-fed linear motor into DC power, and supply power to the vehicle-mounted battery through the DC circuit;

[0011] The on-vehicle storage battery is used to provide electrical energy to the electric drive and the rotating motor in a discharged state, so that the electric drive and the rotating motor drive the wheels to rotate.

[0012] On the other hand, an embodiment of the present application provides a transportation system, the system comprising a long stator road and an electric car:

[0013] The long stator road includes a long stator lane paved with a linear motor long stator and a power supply;

[0014] The electric vehicle is provided with an on-board mover, an on-board bidirectional inverter, an on-board storage battery, and an electric drive and rotating motor;

[0015] The long stator of the linear motor and the vehicle-mounted mover are both composed of an iron core and a three-phase winding, and the winding pole pitch of the long stator of the linear motor and the vehicle-mounted mover is the same;

[0016] The power supply is connected to the three-phase winding of the long stator of the linear motor, and is used to provide three-phase alternating current to the long stator of the linear motor, so that the long stator of the linear motor and the vehicle-mounted mover form a double-fed linear motor;

[0017] The AC end of the vehicle-mounted bidirectional inverter is connected to the three-phase winding of the vehicle-mounted mover, and the DC end is connected to the DC circuit, so as to convert the AC power output by the double-fed linear motor into DC power, and supply power to the vehicle-mounted battery through the DC circuit;

[0018] The on-vehicle storage battery is used to provide electrical energy to the electric drive and the rotating motor in a discharged state, so that the electric drive and the rotating motor drive the wheels to rotate.

[0019] On the other hand, an embodiment of the present application provides a control method for a traffic system, which is applied to an electric vehicle in the traffic system described in the above aspect, and the method includes:

[0020] In response to the dual-fed cruise mode start operation and the electric vehicle entering the long stator lane at the target speed, the on-board bidirectional inverter is controlled to be connected to the DC circuit, and the electric drive and the rotary motor are controlled to be disconnected from the DC circuit, the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover and the DC end is connected to the DC circuit;

[0021] The on-board mover is vector controlled based on the vehicle load, and is used to generate three-phase alternating current with a preset frequency, a preset amplitude and a preset phase based on the vector control. The on-board mover and the long stator of the linear motor in the long stator lane form a doubly-fed linear motor, and the doubly-fed linear motor is used to supply power to the on-board battery through the on-board bidirectional inverter.

[0022] On the other hand, an embodiment of the present application provides a control method for a traffic system, which is applied to a long stator road in the traffic system described in the above aspect, and the method includes:

[0023] Control the power supply of the long stator lane for vehicle detection;

[0024] When the electric vehicle is detected, the power supply is controlled to output three-phase alternating current at a rated frequency and a rated current value.

[0025] On the other hand, an embodiment of the present application provides a control device for a traffic system, which is applied to an electric vehicle in the traffic system described in the above aspect, and the device includes:

[0026] a first control module, for controlling the on-board bidirectional inverter to be connected to the DC circuit, and controlling the electric drive and the rotating motor to be disconnected from the DC circuit in response to the start-up operation of the dual-fed cruise mode and the electric vehicle entering the long stator lane at a target speed, wherein the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover and the DC end is connected to the DC circuit;

[0027] The second control module is used to perform vector control on the vehicle-mounted mover based on the vehicle load, and the vehicle-mounted mover is used to generate three-phase alternating current with a preset frequency, preset amplitude and preset phase based on the vector control. The vehicle-mounted mover and the long stator of the linear motor in the long stator lane form a doubly-fed linear motor, and the doubly-fed linear motor is used to supply power to the vehicle-mounted battery through the vehicle-mounted bidirectional inverter.

[0028] On the other hand, an embodiment of the present application provides a control device for a traffic system, which is applied to a long stator road in the traffic system described in the above aspect, and the device includes:

[0029] A third control module is used to control the power supply of the long stator lane to perform vehicle detection;

[0030] The fourth control module is used to control the power supply to output three-phase alternating current at a rated frequency and a rated current value when the electric vehicle is detected.

[0031] The technical solution provided by this application includes at least the following beneficial effects:

[0032] The long-stator highway, electric vehicle, traffic system and control method of the electric vehicle traffic system provided in the embodiments of the present application form a double-fed linear motor by laying a long stator of a linear motor and a power supply under the long-stator lane and setting an on-board mover in the electric vehicle. During the driving of the vehicle, the long stator winding on the ground transmits electric energy to the on-board winding of the electric vehicle to power the on-board electrical appliances or charge the battery, so that the electric vehicle can charge the battery during driving through the double-fed cruise mode to achieve unlimited endurance, and ensure uniform driving at the same speed, thereby solving the problem of rear-end collisions caused by sudden braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0034] Figure 1 is a structural block diagram of a long stator road and an electric vehicle provided by an exemplary embodiment of the present application;

[0035] Figure 2 is a schematic diagram of a transportation system provided by an exemplary embodiment of the present application;

[0036] Figure 3 is a flow chart of a control method for a traffic system provided by an exemplary embodiment of the present application;

[0037] Figure 4 is a flow chart of a control method for a traffic system provided by another exemplary embodiment of the present application;

[0038] Figure 5 is a structural block diagram of a control device for a traffic system provided by an exemplary embodiment of the present application;

[0039] Figure 6 is a structural block diagram of a control device for a traffic system provided by another exemplary embodiment of the present application;

[0040] Figure 7 It is a structural block diagram of an electronic device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0042] Please refer to Figure 1 , which shows a schematic diagram of the structure of a long stator road provided by an exemplary embodiment of the present application. As shown in the figure, the long stator road includes a long stator lane, and a linear motor long stator 102 and a power supply 103 are laid under the road surface 101 of the long stator lane. The power supply 103 is connected to the three-phase winding of the linear motor long stator 102 to provide three-phase alternating current to the linear motor long stator 102.

[0043] The long stator 102 of the linear motor is composed of an iron core and a three-phase winding, and is used to form a doubly-fed linear motor with an on-board mover 105 inside an electric car 104 traveling on the long stator lane under the action of three-phase alternating current, and power the electric car 104 through magnetic field interaction. The winding pole pitch of the long stator 102 of the linear motor and the on-board mover 105 are the same.

[0044] In a possible implementation, the long stator road includes a long stator lane and a parallel ordinary lane, and the two are connected on the road surface. A linear motor long stator is laid under the road surface of the long stator lane, and a power supply is arranged at a certain interval to connect the three-phase winding of the linear motor long stator to provide the linear motor long stator with three-phase alternating current of a preset frequency and a preset current.

[0045] Correspondingly, an on-board mover is provided in the electric vehicle. When the electric vehicle travels on a long-stator road, the magnetic fields of the on-board mover and the double-fed linear motor that constitutes the long stator of the linear motor interact with each other. The slip power between the on-board mover and the long stator of the linear motor can be used to realize on-board power generation to supply power to the on-board electrical appliances and batteries.

[0046] To summarize, the long stator road provided in the embodiment of the present application forms a doubly-fed linear motor by laying a long stator of a linear motor and a power supply under the long stator lane and setting an on-board mover in an electric car. During the driving of the car, the long stator winding on the ground transmits electrical energy to the on-board winding of the electric car, supplies power to the on-board electrical appliances and charges the battery, thereby achieving unlimited endurance of the electric car.

[0047] Optionally, one or more power supplies are provided in the long stator lane, and each power supply has a corresponding power supply distance according to its capacity and output capability.

[0048] When the power supply does not detect the presence of an electric vehicle within the power supply distance, the power supply does not output three-phase AC power. When an electric vehicle is detected within the power supply distance, the power supply operates and outputs three-phase AC power at a rated frequency and a rated current value.

[0049] In a possible implementation, the power supply determines that there is an electric vehicle traveling within the power supply distance by detecting the existence of an induced electromotive force within the power supply distance, or by using a sensor system laid along the road.

[0050] Optionally, the doubly-fed linear motor is used to generate traction force corresponding to the on-board rotor current value, and the electric vehicle is used to adjust the on-board rotor current value based on the vehicle load, so as to automatically travel on the long stator road at a constant preset speed under the action of the traction force.

[0051] The expressions for the preset speeds include:

[0052] V=2*τ*n N *(1-s)

[0053] Among them, n N is the current synchronous frequency of the long stator of the linear motor, s is the slip ratio between the rotor speed and the stator magnetic field, and τ is the winding pole pitch of the long stator of the linear motor and the on-board rotor.

[0054] In a possible implementation, the double-fed linear motor can generate traction corresponding to the rated stator current while supplying power to the electric vehicle, and can pull the electric vehicle to travel at a constant speed. Therefore, by using the principle that the speed of the linear motor is related to the frequency, the speed of the electric vehicle traveling on the long stator road can be controlled to remain consistent by controlling the current frequency of the long stator of the linear motor.

[0055] Since vehicles with different loads encounter different resistances when traveling at the same speed, in order to ensure that electric vehicles travel at a uniform speed, electric vehicles with different loads require different traction forces. Electric vehicles need to control the current of the on-board actuator based on actual conditions.

[0056] The traction of the doubly-fed linear motor can be used to realize automatic driving of electric vehicles. At the same time, by controlling the size of the traction force, the electric vehicles in the lane can all travel at the same speed. This can solve the problem of rear-end collisions that are prone to occur when braking suddenly due to the small following distance of the vehicle.

[0057] Accordingly, please refer to Figure 1 , which also shows a schematic diagram of the structure of an electric vehicle 104 provided by an exemplary embodiment of the present application. As shown in the figure, the electric vehicle 104 is provided with an on-board mover 105, an on-board bidirectional inverter 106, an on-board battery 107, and an electric drive and rotating motor 108.

[0058] The vehicle-mounted mover 105 is composed of an iron core and a three-phase winding, and is used to form a double-fed linear motor with the linear motor long stator 102 in the long stator track 101. The winding pole pitch of the linear motor long stator 102 is the same as that of the vehicle-mounted mover 105.

[0059] The AC end of the vehicle-mounted bidirectional inverter 106 is connected to the three-phase winding of the vehicle-mounted mover 105, and the DC end is connected to the DC circuit, which is used to convert the AC power output by the double-fed linear motor into DC power and supply power to the vehicle-mounted battery 107 through the DC circuit.

[0060] The vehicle-mounted battery 107 is used to provide electrical energy to the electric drive and rotating motor 108 in a discharged state, so that the electric drive and rotating motor 108 drive the wheels to rotate.

[0061] In a possible implementation, the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board actuator, and the DC end is connected to the DC circuit, which can realize the inverter output of direct current (DC) / alternating current (AC), and can also realize the rectification conversion output of AC / DC.

[0062] When an electric vehicle is traveling on a long-stator road, the magnetic fields of the on-board mover and the doubly-fed linear motor that constitutes the long stator of the linear motor interact with each other. The slip power between the on-board mover and the long stator of the linear motor can be used to achieve on-board power generation to power the on-board electrical appliances and batteries.

[0063] Optionally, the electric vehicle is also provided with an on-board controller 109 .

[0064] The vehicle controller 109 is used to control the vehicle battery 107 to supply power to the electric drive and the rotary motor 108 to drive the wheels to rotate in the normal driving mode.

[0065] The on-board controller 109 is also used to control the closing of the circuit breaker between the on-board bidirectional inverter 106 and the DC circuit, and to control the disconnection of the circuit breaker between the electric drive and rotating motor 108 and the DC circuit in the double-fed cruise mode.

[0066] In one possible implementation, the on-board controller can control the operation mode of the electric vehicle. There are two operation modes, one is the normal mode, in which the on-board battery supplies power to the electric drive and the rotary motor, driving the wheels to rotate the vehicle forward. The other is the double-fed cruise mode, in which the on-board mover and the long stator of the linear motor form a double-fed motor, which can charge the on-board battery while the linear motor pulls the vehicle to run. When the electric vehicle reaches the rated speed of the long-stator highway and changes lanes from the ordinary lane to the long-stator lane, the driver can switch the electric vehicle to the double-fed cruise mode, and the on-board controller controls the circuit breaker connecting the DC circuit to the on-board bidirectional inverter to close, and the circuit breaker connecting the DC circuit to the electric drive and the motor to disconnect. At this time, during the movement of the electric vehicle, electromagnetic induction occurs between the on-board mover and the long stator of the linear motor.

[0067] Optionally, the on-board controller is used to perform vector control on the on-board mover based on the vehicle load when the on-board mover detects an induced electromotive force.

[0068] The on-board mover is used to generate three-phase alternating current with a preset frequency, preset amplitude and preset phase based on vector control. The mover magnetic field of the on-board mover interacts with the stator magnetic field of the long stator of the linear motor to enable the doubly-fed linear motor to generate traction for the electric vehicle.

[0069] While supplying power to electric vehicles, the doubly-fed linear motor can also generate traction corresponding to the rated stator current, which can pull the electric vehicle to travel at a constant speed. Therefore, by using the principle that the speed of the linear motor is related to the frequency, the speed of the electric vehicle on the long stator road can be controlled to remain consistent by controlling the current frequency of the long stator of the linear motor.

[0070] Since vehicles with different loads encounter different resistances when traveling at the same speed, in order to ensure that electric vehicles travel at a uniform speed, electric vehicles with different loads require different traction forces. Electric vehicles need to control the current of the on-board actuator based on actual conditions.

[0071] Optionally, the on-board controller is used to adjust the current value of the on-board stator based on the vehicle load, so that the electric vehicle can automatically travel on the long stator road at a constant preset speed under the action of traction.

[0072] During this process, the on-board controller controls the doubly-fed linear motor to be in a subsynchronous electric state, and the on-board rotor current feeds the DC circuit through the bidirectional inverter to charge the on-board battery to achieve unlimited endurance of the electric vehicle and power the on-board electrical appliances. The output power of the bidirectional inverter is equal to the slip power transmitted between the long stator of the linear motor and the on-board rotor. When an electric vehicle drives in a doubly-fed cruise mode on a long-stator road, it relies on the driver to manually control the steering wheel direction to ensure driving within the lane, or relies on the automatic guidance function of the electric vehicle.

[0073] Please refer to Figure 2 , which shows a schematic diagram of a transportation system provided by an exemplary embodiment of the present application. The system includes a long stator road and an electric car 204.

[0074] The long stator road includes a long stator lane 202 with a linear motor long stator 203 and a power supply. Optionally, the long stator road may also include a common lane 201. The electric car 204 is provided with an on-board mover, an on-board bidirectional inverter, an on-board battery, and an electric drive and a rotating motor.

[0075] The long stator of the linear motor and the vehicle-mounted mover are both composed of an iron core and a three-phase winding, and the winding pole pitch of the long stator of the linear motor and the vehicle-mounted mover are the same.

[0076] The power supply is connected to the three-phase winding of the long stator of the linear motor to provide three-phase alternating current to the long stator of the linear motor, so that the long stator of the linear motor and the vehicle-mounted mover form a double-fed linear motor.

[0077] The AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover, and the DC end is connected to the DC circuit. It is used to convert the AC power output by the doubly-fed linear motor into DC power and supply power to the on-board battery through the DC circuit.

[0078] The on-board battery is used to provide electrical energy to the electric drive and the rotating motor in a discharged state, so that the electric drive and the rotating motor drive the wheels to rotate.

[0079] The process of an electric vehicle completing automatic driving and battery charging by driving on a long stator road can be referred to the above embodiment, and the embodiments of the present application will not be repeated here.

[0080] Please refer to Figure 3 , which shows a flow chart of a control method for a traffic system provided by an exemplary embodiment of the present application. The method is applied to an electric vehicle in the traffic system shown in the above embodiment, and the method includes:

[0081] Step 301, in response to the dual-fed cruise mode start operation and the electric vehicle entering the long stator lane at a target speed, the on-board bidirectional inverter is controlled to be connected to the DC circuit, and the electric drive and the rotating motor are controlled to be disconnected from the DC circuit.

[0082] Among them, the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover and the DC end is connected to the DC circuit.

[0083] In a possible implementation, when the electric vehicle reaches the rated speed of the long stator lane and changes lanes from the ordinary lane to the long stator lane, the driver can switch the electric vehicle to the dual-fed cruise mode, and the on-board controller controls the circuit breaker connecting the DC circuit and the on-board bidirectional inverter to close, and the circuit breaker connecting the DC circuit to the electric drive and the motor to disconnect.

[0084] Step 302: performing vector control on the vehicle-mounted actuator based on the vehicle load.

[0085] The on-board mover is used to generate three-phase alternating current with a preset frequency, preset amplitude and preset phase based on vector control. The on-board mover and the long stator of the linear motor in the long stator lane form a doubly-fed linear motor. The doubly-fed linear motor is used to supply power to the on-board battery through the on-board bidirectional inverter.

[0086] In the doubly-fed cruise mode, the on-board mover and the long stator of the linear motor form a doubly-fed motor, which can charge the on-board battery while pulling the vehicle. When an electric vehicle is driving on the long stator lane, the vehicle adopts automatic driving. The ground power supply outputs three-phase symmetrical AC with a fixed frequency and rated amplitude. The on-board controller controls the on-board bidirectional inverter to ensure that the on-board mover generates a three-phase current with a corresponding frequency and magnitude. The magnetic field generated by the long stator of the linear motor and the on-board mover interacts to generate vehicle traction and braking force, and completes the vehicle-ground energy transmission. The on-board mover outputs electrical energy to the on-board DC circuit through the on-board bidirectional inverter.

[0087] Optionally, the steps of the electronic device performing vector control on the vehicle-mounted mover based on the vehicle load specifically include:

[0088] Based on the vehicle load and the corresponding relationship between the vehicle load and the current value, the current value of the on-board mover is controlled, wherein different vehicle loads correspond to different on-board mover current values, and electric vehicles with different vehicle loads are subjected to different traction forces from the double-fed linear motor.

[0089] The rotor magnetic field and the stator magnetic field are coupled by frequency, and the doubly-fed linear motor generates a rated traction force corresponding to the rated stator current, which drives the electric vehicle to travel at a constant speed. Different vehicles with different loads encounter different resistances when traveling at the same speed. To ensure constant speed, the required traction force is also different. Therefore, each vehicle needs to control the size of the on-board rotor current according to the actual situation.

[0090] The present application proposes an electric vehicle transportation system based on a doubly-fed linear motor and a corresponding method. The structure has two power devices, a doubly-fed linear motor and an electric drive motor. The control method has two modes, a normal mode and a doubly-fed cruise mode. It is flexibly applicable to ordinary roads and long-stator roads. The two power systems ensure more reliable driving capabilities. The transportation system arranges the stator movers of the doubly-fed linear motor on the ground and on the vehicle respectively, and uses the sub-synchronous electric operation characteristics of the doubly-fed motor to achieve unlimited charging and unlimited endurance of electric vehicles. The transportation system uses the characteristics of the linear motor speed being synchronized with the current frequency, and the output current frequency and amplitude of the power supply can be controlled to control the driving speed of the electric vehicle, so that the vehicle can be driven at a constant speed on the long-stator road to avoid rear-end traffic accidents.

[0091] Optionally, the electric vehicle is provided with a plurality of operating modes, including the above-mentioned dual-fed cruise mode and a normal mode, wherein in the dual-fed cruise mode, the electric vehicle can automatically travel on the long stator road according to the above-mentioned process, and in the normal mode, the electric vehicle uses the battery to supply power to the electric drive and the rotating motor. Before executing the above-mentioned step 301, the method provided in the embodiment of the present application may further include the following steps:

[0092] Step 1: In response to the normal mode, the vehicle-mounted battery is controlled to supply power to the electric drive and the rotary motor through the DC circuit to drive the wheels to rotate.

[0093] Step 2: In response to the dual-fed cruise control instruction, the on-board controller is controlled to switch the vehicle operation mode from the normal mode to the dual-fed cruise mode.

[0094] When the electric vehicle reaches the rated speed of the long stator highway and changes lanes from the ordinary lane to the long stator lane, the driver can switch the operation mode of the electric vehicle from the ordinary mode to the dual-fed cruise mode. Correspondingly, when the electric vehicle leaves the long stator lane and enters the ordinary lane, the electric vehicle can automatically switch to the ordinary mode.

[0095] Please refer to Figure 4 , which shows a flow chart of a control method for a traffic system provided by another exemplary embodiment of the present application. The method is applied to a long stator road in the traffic system shown in the above embodiment, and the method comprises:

[0096] Step 401, controlling the power supply of the long stator lane to perform vehicle detection.

[0097] In a possible implementation, the power supply determines that there is an electric vehicle traveling within the power supply distance by detecting the existence of an induced electromotive force within the power supply distance, or by using a sensor system laid along the road.

[0098] Step 402, when an electric vehicle is detected, the power supply is controlled to output three-phase alternating current at a rated frequency and a rated current.

[0099] When the power supply does not detect the existence of an electric vehicle within the power supply distance, the power supply does not output three-phase alternating current. When an electric vehicle is detected within the power supply distance, the power supply works and outputs three-phase alternating current at a rated frequency and a rated current value to power the electric vehicle.

[0100] In summary of the above embodiments, the present application provides a process for an electric vehicle to drive from a normal lane into a long stator lane for charging and then return to the normal lane as follows:

[0101] When an electric vehicle is driving on a normal lane, it is in normal mode. At this time, the circuit breaker connecting the DC circuit and the on-board bidirectional inverter is disconnected, and the on-board controller controls the on-board battery to power the DC circuit. The circuit breaker connecting the electric drive and the motor is closed, and the motor drives the four wheels to rotate to provide power for the electric vehicle. In this mode, the electric vehicle is an ordinary car, and can accelerate, decelerate, and change lanes under the driver's operation.

[0102] The ordinary lane and the long stator lane are built in combination, and the two lanes can enter and exit each other. The long stator lane is paved with a linear motor long stator, and a power supply is used every certain distance (such as 10km). The power supply is not limited to DC / AC conversion. When there is no electric car running on the long stator lane within the distance range, the power supply outputs a very small current with a fixed frequency, and the loss of the linear motor long stator is very small.

[0103] When the electric vehicle reaches the rated speed of the long stator lane and changes lanes from the ordinary lane to the long stator lane, the driver can put the electric vehicle into the double-fed cruise mode, and the on-board controller controls the circuit breaker connecting the DC circuit and the on-board bidirectional inverter to close, and the circuit breaker connecting the DC circuit to the electric drive and the motor is disconnected. At this time, during the movement of the electric vehicle, the on-board mover and the long stator of the linear motor are electromagnetically induced, and the stator side will detect the induced electromotive force, thereby determining that there is a vehicle driving on the long stator lane. The stator side then performs scalar control on the frequency and current amplitude, and the fixed-frequency symmetrical three-phase alternating current output by the power supply increases to the rated value and remains unchanged; on the mover side, the on-board mover winding will induce an electromotive force, and generate a three-phase alternating current of a certain frequency, amplitude, and phase under the vector control of the on-board controller. The mover magnetic field and the stator magnetic field are coupled through frequency, and the double-fed linear motor generates a rated traction force corresponding to the rated stator current, pulling the electric vehicle to achieve constant speed travel. Different vehicles with different loads encounter different resistances when driving at the same speed. To ensure uniform speed, the required traction is also different. Therefore, each vehicle needs to control the size of the on-board mover current according to the actual situation. During this process, the on-board controller controls the doubly-fed linear motor to be in a subsynchronous electric state. The on-board mover current feeds the DC circuit through the bidirectional inverter to charge the on-board battery to achieve unlimited endurance of the electric vehicle and power the on-board electrical appliances. The output power of the bidirectional inverter is equal to the slip power transmitted between the long stator of the linear motor and the on-board mover. Electric vehicles travel in doubly-fed cruise mode on long stator lanes, relying on the driver to manually control the steering wheel direction to ensure driving within the lane, or relying on the automatic guidance function of the electric vehicle.

[0104] When an electric vehicle exits the dual-fed cruise mode and enters the normal mode, it can drive out of the long stator lane and exit the constant speed driving.

[0105] Please refer to Figure 5 , which shows a structural block diagram of a control device for a traffic system provided by an exemplary embodiment of the present application, the device is applied to an electric vehicle in the traffic system described in the above embodiment, and the device includes:

[0106] The first control module 501 is used for controlling the on-board bidirectional inverter to be connected to the DC circuit in response to the start-up operation of the dual-fed cruise mode and the electric vehicle entering the long stator lane at a target speed, and controlling the electric drive and the rotating motor to be disconnected from the DC circuit, wherein the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover and the DC end is connected to the DC circuit;

[0107] The second control module 502 is used to perform vector control on the vehicle-mounted mover based on the vehicle load, and the vehicle-mounted mover is used to generate three-phase alternating current with a preset frequency, preset amplitude and preset phase based on the vector control. The vehicle-mounted mover and the long stator of the linear motor in the long stator lane form a doubly-fed linear motor, and the doubly-fed linear motor is used to supply power to the vehicle-mounted battery through the vehicle-mounted bidirectional inverter.

[0108] Optionally, the second control module 502 is further configured to:

[0109] Based on the vehicle load and the corresponding relationship between the vehicle load and the current value, the current value of the vehicle-mounted mover is controlled, wherein different vehicle loads correspond to different vehicle-mounted mover current values, and the electric vehicles with different vehicle loads are subjected to different traction forces of the doubly-fed linear motor. The traction force of the doubly-fed linear motor is balanced with the resistance of the electric vehicle so that the electric vehicle travels at a constant speed.

[0110] Optionally, the device further includes a fifth control module, configured to:

[0111] In response to the normal mode, controlling the on-board battery to supply power to the electric drive and the rotary motor through the DC circuit to drive the wheels to rotate;

[0112] In response to the dual-fed cruise command, the on-board controller is controlled to switch the vehicle operation mode from the normal mode to the dual-fed cruise mode.

[0113] Please refer to Figure 6 , which shows a structural block diagram of a control device for a traffic system provided by an exemplary embodiment of the present application, the device is applied to a long stator road in the traffic system described in the above embodiment, the device comprises:

[0114] The third control module 601 is used to control the power supply of the long stator lane to perform vehicle detection;

[0115] The fourth control module 602 is used to control the power supply to output three-phase alternating current at a rated frequency and a rated current value when the electric vehicle is detected.

[0116] An embodiment of the present application provides an electronic device; Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown in FIG. Figure 7As shown, the electronic device 700 includes: a processor 701, at least one communication bus 702, a user interface 703, at least one external communication interface 704, and a memory 705. The communication bus 702 is configured to realize the connection and communication between these components. The user interface 703 may include a display screen, and the external communication interface 704 may include a standard wired interface and a wireless interface. The processor 701 is configured to execute the program of the control method of the electric vehicle stored in the memory to implement the steps in the method provided in the above embodiment.

[0117] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is loaded and executed by a processor to implement the method described in the above embodiment.

[0118] The embodiment of the present application further provides a computer program product, which runs on a processor of a computer device, so that the computer device executes the method described in the above embodiment.

[0119] It should be noted here that the description of the above storage medium, electronic device, and remote control embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium and device embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0120] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable storage medium or transmitted as one or more instructions or codes on a computer-readable storage medium. Computer-readable storage media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0121] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the scope and spirit of the present disclosure. If these changes and modifications fall within the scope of the claims of the present disclosure and their equivalents, the intention of the present disclosure also includes these changes and modifications.

Claims

1. A long stator road, characterized in that: The long stator road includes a long stator lane; A linear motor long stator and a power supply are laid under the road surface of the long stator lane; The power supply is connected to the three-phase winding to provide three-phase alternating current to the long stator of the linear motor; The long stator of the linear motor is composed of an iron core and the three-phase winding, and is used to form a double-fed linear motor with the on-board mover inside the electric vehicle traveling on the long stator lane under the action of the three-phase alternating current, and power the electric vehicle through magnetic field interaction. The long stator of the linear motor has the same winding pole pitch as the on-board mover.

2. The long stator road according to claim 1, characterized in that: The power supplies are laid at preset intervals in the long stator lane, and each power supply corresponds to a power supply section; The power supply does not output current to the outside when the electric vehicle is not detected within the power supply distance, and outputs three-phase alternating current at a rated frequency and a rated current value when the electric vehicle is detected within the power supply distance; The long stator of the linear motor is used to determine that the electric vehicle is traveling within the power supply distance when an induced electromotive force is detected within the power supply distance.

3. The long stator road according to claim 2, characterized in that: The double-fed linear motor is used to generate a traction force corresponding to the vehicle-mounted mover current value, and the electric vehicle is used to adjust the vehicle-mounted mover current value based on the vehicle load, so as to automatically travel on the long stator road at a constant preset speed under the action of the traction force; The expression of the preset speed includes: V=2*τ*n N *(1-s) Among them, n N is the current synchronization frequency of the long stator of the linear motor, s is the slip ratio between the rotor speed and the stator magnetic field, and τ is the winding pole pitch of the long stator of the linear motor and the vehicle-mounted rotor.

4. An electric vehicle, characterized in that: The electric vehicle is provided with an on-board mover, an on-board bidirectional inverter, an on-board storage battery, and an electric drive and rotating motor; The vehicle-mounted mover is composed of an iron core and a three-phase winding, and is used to form a double-fed linear motor with a long stator of a linear motor in a long stator lane, and the long stator of the linear motor has the same winding pole pitch as the vehicle-mounted mover; The AC end of the vehicle-mounted bidirectional inverter is connected to the three-phase winding of the vehicle-mounted mover, and the DC end is connected to the DC circuit, so as to convert the AC power output by the double-fed linear motor into DC power, and supply power to the vehicle-mounted battery through the DC circuit; The on-vehicle storage battery is used to provide electrical energy to the electric drive and the rotating motor in a discharged state, so that the electric drive and the rotating motor drive the wheels to rotate.

5. The electric vehicle according to claim 4, characterized in that: The electric vehicle is also provided with an on-board controller; The on-board controller is used to control the on-board battery to supply power to the electric drive and the rotary motor to drive the wheels to rotate in the normal driving mode; The on-board controller is also used to control the closing of the circuit breaker between the on-board bidirectional inverter and the DC circuit in the dual-fed cruise mode, and to control the disconnection of the circuit breaker between the electric drive and the rotating motor and the DC circuit.

6. The electric vehicle according to claim 5, characterized in that: The on-board controller is used to perform vector control on the on-board mover based on the vehicle load when the on-board mover detects an induced electromotive force; The vehicle-mounted mover is used to generate three-phase alternating current with a preset frequency, preset amplitude and preset phase based on the vector control. The mover magnetic field of the vehicle-mounted mover interacts with the stator magnetic field of the long stator of the linear motor, so that the doubly-fed linear motor generates traction for the electric vehicle.

7. The electric vehicle according to claim 6, characterized in that: The on-board controller is used to adjust the current value of the on-board mover based on the vehicle load, so that the electric vehicle can automatically travel on the long stator road at a constant preset speed under the action of the traction force.

8. A transportation system, characterized in that: The system comprises a long stator road and electric vehicle: The long stator road includes a long stator lane paved with a linear motor long stator and a power supply; The electric vehicle is provided with an on-board mover, an on-board bidirectional inverter, an on-board storage battery, and an electric drive and rotating motor; The long stator of the linear motor and the vehicle-mounted mover are both composed of an iron core and a three-phase winding, and the winding pole pitch of the long stator of the linear motor and the vehicle-mounted mover is the same; The power supply is connected to the three-phase winding of the long stator of the linear motor, and is used to provide three-phase alternating current to the long stator of the linear motor, so that the long stator of the linear motor and the vehicle-mounted mover form a double-fed linear motor; The AC end of the vehicle-mounted bidirectional inverter is connected to the three-phase winding of the vehicle-mounted mover, and the DC end is connected to the DC circuit, so as to convert the AC power output by the double-fed linear motor into DC power, and supply power to the vehicle-mounted battery through the DC circuit; The on-vehicle storage battery is used to provide electrical energy to the electric drive and the rotating motor in a discharged state, so that the electric drive and the rotating motor drive the wheels to rotate.

9. A method for controlling a traffic system, characterized in that: The electric vehicle used in the transportation system of claim 8, the method comprising: In response to the dual-fed cruise mode start operation and the electric vehicle entering the long stator lane at the target speed, the on-board bidirectional inverter is controlled to be connected to the DC circuit, and the electric drive and the rotary motor are controlled to be disconnected from the DC circuit, the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover and the DC end is connected to the DC circuit; The on-board mover is vector controlled based on the vehicle load, and is used to generate three-phase alternating current with a preset frequency, a preset amplitude and a preset phase based on the vector control. The on-board mover and the long stator of the linear motor in the long stator lane form a doubly-fed linear motor, and the doubly-fed linear motor is used to supply power to the on-board battery through the on-board bidirectional inverter.

10. The method according to claim 9, characterized in that The vector control of the vehicle-mounted mover based on the vehicle load includes: Based on the vehicle load and the corresponding relationship between the vehicle load and the current value, the current value of the vehicle-mounted mover is controlled, wherein different vehicle loads correspond to different vehicle-mounted mover current values, and the electric vehicles with different vehicle loads are subjected to different traction forces of the doubly-fed linear motor. The traction force of the doubly-fed linear motor is balanced with the resistance of the electric vehicle so that the electric vehicle travels at a constant speed.

11. The method according to claim 9, characterized in that In response to the dual-fed cruise mode starting operation and the electric vehicle entering the long stator lane at the target speed, before controlling the on-board bidirectional inverter to be connected to the DC circuit, the method includes: In response to the normal mode, controlling the on-board battery to supply power to the electric drive and the rotary motor through the DC circuit to drive the wheels to rotate; In response to the dual-fed cruise command, the on-board controller is controlled to switch the vehicle operation mode from the normal mode to the dual-fed cruise mode.

12. A method for controlling a traffic system, characterized in that: The long stator road used in the traffic system of claim 8, the method comprising: Control the power supply of the long stator lane for vehicle detection; When the electric vehicle is detected, the power supply is controlled to output three-phase alternating current at a rated frequency and a rated current value.

13. A control device for a traffic system, characterized in that: The electric vehicle used in the transportation system of claim 8, the device comprising: a first control module, for controlling the on-board bidirectional inverter to be connected to the DC circuit, and controlling the electric drive and the rotating motor to be disconnected from the DC circuit in response to the start-up operation of the dual-fed cruise mode and the electric vehicle entering the long stator lane at a target speed, wherein the AC end of the on-board bidirectional inverter is connected to the three-phase winding of the on-board mover and the DC end is connected to the DC circuit; The second control module is used to perform vector control on the vehicle-mounted mover based on the vehicle load, and the vehicle-mounted mover is used to generate three-phase alternating current with a preset frequency, preset amplitude and preset phase based on the vector control. The vehicle-mounted mover and the long stator of the linear motor in the long stator lane form a doubly-fed linear motor, and the doubly-fed linear motor is used to supply power to the vehicle-mounted battery through the vehicle-mounted bidirectional inverter.

14. A control device for a traffic system, characterized in that: The long stator road used in the traffic system of claim 8, the device comprising: A third control module is used to control the power supply of the long stator lane to perform vehicle detection; The fourth control module is used to control the power supply to output three-phase alternating current at a rated frequency and a rated current value when the electric vehicle is detected.

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