Novel electric vehicle starting method and system

Abstract

The invention provides a novel electric vehicle starting method and system. The method comprises the following steps that an electric vehicle rotating handle rotates to send out an electric signal; performing linear integration on the electric signal sent by the rotating handle to obtain a starting signal; and the driving controller receives a starting signal obtained in the linear integration process, outputs a driving signal of which the frequency is linearly increased based on the starting signal, and drives the motor to linearly increase the rotating speed until the starting is completed. According to the invention, the constant acceleration starting of the motor is realized, so that the starting current is reduced, the waste of the current is avoided, the energy efficiency during the starting of the motor is improved, and the endurance mileage of the electric vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a novel electric vehicle starting method and system. Background Art

[0002] At present, electric vehicles use three-phase permanent magnet motors. Their controllers convert DC power into three phases of alternating voltage with a phase difference of 120° to drive the motors. The motor speed is determined by the frequency of the alternating voltage output by the controller. The Hall switch gives different signals, driving the controller to generate sine waves of different frequencies to make the motor produce different corresponding speeds, thus achieving the purpose of motor speed regulation.

[0003] When an electric vehicle is started, the motor's self-inductance potential is not established, so the starting current is very large, 5-7 times the normal current. When an electric vehicle is in use, the motor will be shut down and restarted in various situations such as waiting for traffic lights at intersections or in traffic jams, which greatly reduces the range of the electric vehicle. Summary of the invention

[0004] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a novel electric vehicle starting method and system.

[0005] In order to achieve the above-mentioned object of the present invention, the present invention provides a novel electric vehicle starting method, comprising the following steps:

[0006] The electric vehicle's handlebar turns to send out an electrical signal;

[0007] Perform linear integration on the electrical signal emitted by the handle to obtain the start signal;

[0008] The drive controller receives the start signal obtained in the linear integration process, and outputs a drive signal with a linearly increasing frequency based on the start signal, driving the motor to linearly increase the speed until the start is completed.

[0009] In an optional solution of the novel electric vehicle starting method, an integral slope is set for linear integration of the electrical signal emitted by the handlebar, and the starting duration of the motors of different vehicle models is controlled based on the integral slope.

[0010] In an optional solution of the novel electric vehicle starting method, the step of setting the integral slope is:

[0011] For a designated vehicle model, the rated load, preset wind resistance and transmission resistance are loaded on the conventional electric vehicle of the designated vehicle model;

[0012] Turn the handle to start the motor, and record the time it takes for the motor to go from 0 speed to the rated speed when it starts successfully;

[0013] The ratio of the rated rotation speed to the time is taken as the integral slope.

[0014] The present application also proposes a novel electric vehicle starting system, comprising:

[0015] A handle for sending electrical signals;

[0016] An integration module, electrically connected to the throttle, for performing linear integration on the electrical signal emitted by the throttle to output a start signal;

[0017] A drive controller, electrically connected to the integration module, receives a start signal output by the integration module, and outputs a drive signal with a linearly increasing frequency to the motor;

[0018] The motor is electrically connected to the drive controller, and the drive signal output by the drive controller drives the motor to linearly increase the speed until the start-up is completed.

[0019] In an optional solution of the novel electric vehicle starting system, the integration module is integrated into the drive controller.

[0020] The present application also proposes an electric vehicle, which includes the above-mentioned novel electric vehicle starting system.

[0021] The present application also proposes an electric vehicle, which is started based on the above-mentioned novel electric vehicle starting method.

[0022] The beneficial effects of the present invention are:

[0023] In the present application, the electrical signal emitted by the handle is linearly integrated, and the drive controller outputs a drive signal with a linearly increasing frequency to the motor, so that the motor is driven to linearly increase the speed to start, thereby achieving equal acceleration starting of the motor, thereby reducing the starting current, avoiding current waste, improving the energy efficiency of the motor when starting, and improving the cruising range of the electric vehicle.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 It is the schematic diagram of the integral slope design;

[0027] Figure 2 It is a principle block diagram of the second embodiment. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] Embodiment 1

[0031] This embodiment provides a novel electric vehicle starting method. In this embodiment, the electric vehicle uses a three-phase permanent magnet motor, and the drive controller inverts the DC power into three alternating voltage drive motors with a phase difference of 120°. Specifically, the following steps are included:

[0032] When starting, turn the handlebar of the electric vehicle, and the handlebar rotates to generate an electrical signal; the start signal is obtained by linearly integrating the electrical signal generated by the handlebar, and the integration can be achieved through the slope function. Since the start signal is obtained by linearly integrating the electrical signal generated by the handlebar, the start signal has the property of linear rise.

[0033] The drive controller receives the linearly increasing start signal obtained in the linear integration process, and outputs a drive signal with a linearly increasing frequency based on the start signal, which is a sine wave signal with a linearly increasing frequency in this embodiment, and drives the motor to generate a corresponding linearly increasing speed until the start is completed. The step of linearly integrating the electrical signal emitted by the handle to obtain the start signal can be performed in the drive controller.

[0034] Due to different vehicle models and different starting conditions, fast starting will increase the wasted current; slow starting will also affect the starting acceleration and overspeed acceleration. Therefore, the integral slope K of the linear integral can be set, and the starting time of the motor of different vehicle models can be controlled based on the integral slope K to maximize the motor energy efficiency.

[0035] In this embodiment, the steps of setting the integral slope K are:

[0036] For a specified model, the rated load, preset wind resistance and transmission resistance are loaded on the conventional electric vehicle of the specified model on the test bench. The preset wind resistance and transmission resistance can be obtained by measuring when starting the conventional electric vehicle.

[0037] Turn the handle to start the motor and record the time t required for the motor to start from 0 speed to the rated speed v successfully.

[0038] The ratio of the rated rotation speed v to the time t is taken as the integral slope K.

[0039] like Figure 1 As shown, the start-up completion time measured in this embodiment is 4 seconds, that is, the integral slope Theoretically, different car models should have different K values.

[0040] Embodiment 2

[0041] This embodiment provides a novel electric vehicle starting system. Figure 2 As shown, it includes: a handle, an integration module, a drive controller and a motor. The handle is used to send out an electrical signal; the integration module is electrically connected to the handle, and is used to linearly integrate the electrical signal sent out by the handle to output a start signal; the drive controller is electrically connected to the integration module, receives the start signal output by the integration module, and outputs a drive signal with a linearly increasing frequency to the motor; the motor is electrically connected to the drive controller, and the drive signal output by the drive controller drives the motor to generate a corresponding linearly increasing speed until the start is completed.

[0042] In this embodiment, the integration module can be integrated into the drive controller.

[0043] Embodiment 3

[0044] This embodiment provides an electric vehicle, which is started by using the new electric vehicle starting method provided in the first embodiment.

[0045] Embodiment 4

[0046] This embodiment provides an electric vehicle, which includes the new electric vehicle starting system provided in the second embodiment, and the electric vehicle is started based on the new electric vehicle starting system.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A novel electric vehicle starting method, characterized in that: The following steps are involved: The electric vehicle's handlebar turns to send out an electrical signal; Perform linear integration on the electrical signal emitted by the handle to obtain the start signal; The drive controller receives the start signal obtained in the linear integration process, and outputs a drive signal with a linearly increasing frequency based on the start signal, driving the motor to linearly increase the speed until the start is completed.

2. The new electric vehicle starting method according to claim 1, characterized in that: Set the integral slope for linear integration of the electrical signal emitted by the handlebar, and control the start-up duration of the motor of different vehicle models based on the integral slope.

3. The new electric vehicle starting method according to claim 2 is characterized in that: The steps for setting the integral slope are: For a designated vehicle model, the rated load, preset wind resistance and transmission resistance are loaded on the conventional electric vehicle of the designated vehicle model; Turn the handle to start the motor, and record the time it takes for the motor to go from 0 speed to the rated speed when it starts successfully; The ratio of the rated rotation speed to the time is taken as the integral slope.

4. A new electric vehicle starting system, characterized in that: include: A handle for sending electrical signals; An integration module, electrically connected to the throttle, for performing linear integration on the electrical signal emitted by the throttle to output a start signal; A drive controller, electrically connected to the integration module, receives a start signal output by the integration module, and outputs a drive signal with a linearly increasing frequency to the motor; The motor is electrically connected to the drive controller, and the drive signal output by the drive controller drives the motor to linearly increase the speed until the start-up is completed.

5. The new electric vehicle starting system according to claim 4 is characterized in that: The integration module is integrated in the drive controller.

6. An electric vehicle, characterized in that: The electric vehicle comprises the novel electric vehicle starting system as claimed in claim 4 or 5.

7. An electric vehicle, characterized in that: The electric vehicle is started based on the novel electric vehicle starting method described in any one of claims 1-3.

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