Instrument-based Control Method, System and Pure Electric Bus for Pure Electric Bus

Abstract

The present invention discloses an instrument-based pure electric bus control method, system, and pure electric bus, belonging to the field of pure electric bus control technology. The method comprises an instrument, a power module, and a sensor unit. The instrument has a built-in control module and a processor. The processor communicates with a battery management system to obtain a high-voltage battery charging connection success message. The power module is connected to the instrument so that the processor obtains the power status signal of the pure electric bus. The processor is connected to the sensor unit to directly obtain the device status signal collected by the sensor. Based on the power status signal and / or the device status signal and the high-voltage battery charging connection success message, a device control signal is generated and output to the control module. The control module directly inputs the device control signal to the corresponding device. The method can directly control components on the pure electric bus with high real-time requirements based on the current status of the pure electric bus, thereby solving the problem that the existing whole vehicle control is completely dependent on the whole vehicle controller, with a large communication load and poor control accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of pure electric buses, and in particular to an instrument-based pure electric bus control method and system, and a pure electric bus. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] The instrument cluster of a pure electric bus is usually placed on the dashboard in front of the driver. It is a display device for the working conditions of various components of the vehicle. It can read information such as vehicle speed, mileage, motor speed and temperature, high-voltage battery power, and vehicle fault alarms, bringing convenience to driving.

[0004] Currently, most pure electric instruments on the market only work when powered on. They cannot work during high-voltage charging and cannot meet the display requirements of pure electric buses during all working hours. Most CAN bus single instruments do not have computing and processing capabilities and are simply passive displays. The control function can only be realized after the instrument communicates with the vehicle controller or other equipment, which indirectly causes a large communication load on the vehicle, poor control accuracy, and is prone to failure.

[0005] Many pure electric bus CAN bus system instruments are composed of one instrument + one or two control module states. Although they can realize the functions, they are expensive, uneconomical, and result in waste of resources. Most instrument displays and control logic are not clear enough, and there is no unified standard for display status, which gives the driver a poor experience, cannot fully display the characteristics of pure electric buses, cannot fully meet actual use needs, and have poor practicality. Summary of the Invention

[0006] In order to address the deficiencies of the prior art, the present invention provides an instrument-based pure electric bus control method, system, and pure electric bus, which utilize the processor and control module built into the CAN bus instrument and input communication signals, sensor signals, etc. to perform logical control of components with high real-time control requirements.

[0007] In a first aspect, the present invention provides an instrument-based pure electric bus control system;

[0008] A pure electric bus control system based on an instrument, comprising:

[0009] An instrument having a built-in processor and a control module, wherein the processor is in communication with a battery management system to obtain a high-voltage battery charging connection success message;

[0010] a power module, the power module being electrically connected to the instrument so that the processor obtains a power status signal of the pure electric bus;

[0011] The sensor unit, the processor is electrically connected to the sensor unit to directly obtain the device status signal collected by the sensor unit, and generates a device control signal according to the power status signal and / or device status signal and the high-voltage battery charging connection success message, and outputs it to the control module. The control module directly inputs the device control signal to the corresponding device.

[0012] Furthermore, the power module includes 24V normal power, switching power supply, ignition power supply, charging power supply and ground wire, and the sensor unit includes a first air pressure sensor and a second air pressure sensor, the first air pressure sensor is arranged on the air compressor, and the second air pressure sensor is arranged on the rear axle brake air reservoir.

[0013] Preferably, the generating of a device control signal according to the power state signal and the device state signal and outputting it to the control module, wherein the control module directly inputs the device control signal to the corresponding device, comprises:

[0014] When the charging power pin of the power module obtains an input electrical signal and the processor obtains a high-voltage battery charging connection success message, it sends a vehicle information message to the vehicle CAN network and controls the display module to display the charging status;

[0015] When the charging power pin of the power module obtains an input electrical signal and the processor does not obtain a high-voltage battery charging connection success message, a vehicle information message is sent to the vehicle CAN network to implement vehicle self-test;

[0016] After the processor obtains the high-voltage message from the vehicle, it obtains the air pressure of the air compressor. When the air pressure is less than the preset working threshold, the control module sends an enable signal to the air compressor. If the dryer exhaust signal is obtained at the same time, the control module outputs the enable signal to the air compressor after a delay of the preset time threshold.

[0017] When the processor obtains the forced working signal of the air compressor, it sends an enabling working signal to the air compressor through the control module.

[0018] Preferably, the sensor unit further includes a fuel quantity sensor, which is arranged in the fuel tank of the fuel heating main unit and is electrically connected to the processor.

[0019] Further preferably, the generating of the device control signal according to the power status signal and the device status signal and outputting it to the control module, wherein the control module directly inputs the device control signal to the corresponding device further comprises:

[0020] When the processor obtains the fuel quantity signal, the control display module displays the fuel symbol.

[0021] Preferably, the generating of the device control signal according to the power state signal and the device state signal and outputting it to the control module, wherein the control module directly inputs the device control signal to the corresponding device further comprises:

[0022] When the ignition power pin of the power module obtains an input electrical signal, the processor outputs a daytime running light on signal through the control module;

[0023] When the processor obtains a low beam on signal, a high beam on signal, a front fog light on signal, a hazard warning wake-up signal, or a turn signal start signal, the processor stops outputting a daytime running light on signal;

[0024] When the processor obtains a low beam off signal, a high beam off signal, a front fog light off signal or a turn signal off signal, the processor outputs a daytime running light on signal through the control module after a preset time threshold.

[0025] Preferably, the generating of the device control signal according to the power state signal and the device state signal and outputting it to the control module, wherein the control module directly inputs the device control signal to the corresponding device further comprises:

[0026] When the 24V normal power is on and the switch power is off, the processor obtains the front door opening signal and outputs the night light start signal via the control module within a preset time period.

[0027] Furthermore, the processor obtains a vehicle speed signal and converts the vehicle speed signal into a pulse signal.

[0028] In a second aspect, the present invention provides a pure electric bus control method based on an instrument;

[0029] A method for controlling a pure electric bus based on an instrument, based on the above-mentioned pure electric bus control system based on an instrument, is characterized by comprising:

[0030] Obtain high-voltage battery charging connection success message, pure electric bus power status signal and device status signal;

[0031] According to the power status signal and / or device status signal and the high-voltage battery charging connection success message, a device control signal is generated and directly input to the corresponding device.

[0032] In a third aspect, the present invention provides a pure electric bus;

[0033] A pure electric bus comprises the above-mentioned instrument-based pure electric bus control system or executes the above-mentioned instrument-based pure electric bus control method.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The technical solution provided by the present invention, based on the current status of pure electric buses, uses the automatic processor in the instrument to realize the direct reading of sensor signals, general signals and pure electric signals and the direct control of corresponding devices, thereby improving the response speed, improving the control accuracy, and ensuring the safety of electric buses.

[0036] 2. The technical solution provided by the present invention improves adaptability and practicality by organically integrating and matching the functions of CAN bus instruments. A single instrument can meet the functional requirements, greatly reducing manufacturing costs and achieving higher economic benefits. The integrated and compatible design has a simple and reliable structure, strong practicality, and is easy to maintain and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0038] Figure 1 A schematic diagram of the system architecture provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the connection of the instrument provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0042] Example 1

[0043] The control method of pure electric buses in the existing technology completely relies on the communication between the vehicle controller and other equipment, has high requirements for data communication transmission, poor control accuracy, and time delay; therefore, the present invention provides an instrument-based pure electric bus control system.

[0044] Next, combine Figure 1-Figure 2, a pure electric bus control system based on an instrument disclosed in this embodiment is described in detail. The pure electric bus control system based on an instrument includes an instrument, a power module and a sensor unit. The processor is electrically connected to the control module. The instrument has a built-in processor and a control module. The processor is communicatively connected to the battery management system to obtain a high-voltage battery charging connection success message; the power module is electrically connected to the instrument so that the control unit obtains a power status signal of the pure electric bus; the processor is electrically connected to the sensor unit to directly obtain a device status signal collected by the sensor, and generates a device control signal according to the power status signal and / or the device status signal and the high-voltage battery charging connection success message and outputs it to the control module. The control module directly inputs the device control signal to the corresponding device.

[0045] As an embodiment, the sensor unit includes a first air pressure sensor, a second air pressure sensor and a fuel quantity sensor. The first air pressure sensor is installed on the air compressor, the second air pressure sensor is installed on the rear axle brake air reservoir, and the fuel quantity sensor is installed on the fuel heating main engine tank.

[0046] When the charging power pin of the power module has input and the processor receives a message indicating that the high-voltage battery charging is successfully connected through the CAN bus, the instrument panel wakes up and sends a message of vehicle information (such as current speed, accumulated mileage, etc.) to the vehicle CAN network; at the same time, the display module only displays the charging status (such as charging current, battery SOC, battery voltage, etc.) to facilitate the driver to check the charging status.

[0047] When the charging power pin of the power module has input but no charging connection success message is received, it is considered to be in the vehicle self-test wake-up state. The processor only wakes up and works, the display module is not lit and is in a black screen state. It also sends the vehicle information to the vehicle CAN bus to realize the storage and reading of the vehicle message during the vehicle self-test.

[0048] The power module includes 24V normal power, switching power supply, ignition power supply, charging power supply and ground wire. The 24V normal power is the working power supply of the instrument; the switching power supply wakes up the instrument and the display interface enters the power-on LOGO; the ignition power supply wakes up the instrument and enters the normal display interface; the ground wire is the negative working pole of the instrument; the charging power supply is the charging wake-up input.

[0049] By differentiating the above power supplies into different levels, the instrument can enter different working states and display interfaces respectively, realizing output control of different working functions.

[0050] The fuel level sensor is a unique display feature developed for pure electric vehicles. When a pure electric vehicle is equipped with a fuel heater and a fuel tank, the instrument panel displays the fuel level, making it easy for the driver to check the fuel level. A special control pin is also implemented. If no signal is input, the instrument panel does not display the fuel level symbol, improving the universality of the display across pure electric vehicles.

[0051] The air compressor is enabled when the processor receives the high-pressure message from the vehicle and judges the pressure of the air pressure sensor in the instrument input pin: if the air pressure is less than 6.9 bar, the control output pin of the control module outputs the enable work signal to make the air compressor work. When the dryer exhaust signal (exhaust when the vehicle air pressure is full) is received, the processor stops outputting the work enable signal after a delay of 15 seconds; if the air pressure is greater than 6.9 bar and there is no output signal, when the air compressor forced work signal is received, the control module forces the output to control the air compressor to work through the control output pin.

[0052] This logic determines the air compressor's operation enable based on a comprehensive evaluation of factors such as high-voltage power-on, air tank pressure, dryer exhaust, and forced enable. This effectively reduces energy consumption and provides precise control over the air compressor's operation. Furthermore, if the vehicle's air pressure sensor or dryer exhaust signal fails, the driver can force the compressor's operation by pressing the forced activation signal or outputting the compressor enable signal, forcing the compressor to start and ensuring normal vehicle operation.

[0053] As an implementation method, the daytime running light logic is:

[0054] (1) When the ignition power pin of the power module has an input, the processor immediately outputs an on electrical signal to the daytime running lights through the control output pin of the control module, and the daytime running lights turn on; when the ignition power is turned off, the opposite is true.

[0055] (2) When the processor obtains the low beam on signal, the processor outputs the off electrical signal to the daytime running lights through the control output pin of the control module; when the processor obtains the low beam off signal, the processor delays for 2 seconds and then outputs the off electrical signal to the daytime running lights through the control output pin of the control module.

[0056] (3) When the processor obtains the high beam on signal, the processor outputs the off electrical signal to the daytime running lights through the control output pin of the control module; when the processor obtains the high beam off signal, the processor delays for 2 seconds and then outputs the off electrical signal to the daytime running lights through the control output pin of the control module.

[0057] (4) When the processor obtains the front fog lamp on signal, the processor outputs the off electrical signal to the daytime running lights through the control output pin of the control module; when the processor obtains the front fog lamp off signal, the processor immediately outputs the on electrical signal to the daytime running lights through the control output pin of the control module.

[0058] (5) When the processor obtains the double flash alarm wake-up signal, it stops outputting the daytime running light on signal and simultaneously activates the double flash lights displayed in the instrument display module to light up.

[0059] (6) When the processor receives the turn signal on signal, it outputs an off signal to the daytime running lights through the control output pin of the control module. When the processor receives the turn signal off signal, it immediately outputs an on signal to the daytime running lights through the control output pin of the control module, thereby effectively controlling the daytime running lights. This pin is controlled by the instrument panel and can replace a separate daytime running light controller, effectively reducing the cost of the entire vehicle.

[0060] As an implementation, when the 24V mains voltage is active and the switch power supply is disconnected, the processor receives a front door open signal and outputs a 15-second nighttime light activation signal through the control module's control output pin before disconnecting power. This ensures that the driver's area remains illuminated for 15 seconds when exiting the vehicle, ensuring safety for drivers exiting at night. This pin can replace a separate lighting controller, reducing costs while improving safety and controllability, effectively meeting user-friendly requirements.

[0061] As an implementation, a driver-out-of-seat alarm is also included. When the processor receives a high-voltage and gear position message from the vehicle controller and detects the driver's absence, it controls the instrument panel's built-in buzzer to sound an alarm and the display module to display a driver-out-of-seat sign. This control function effectively improves the reliability of pure electric vehicles and avoids safety hazards caused by a loss of control.

[0062] As an implementation method, the processor in the instrument obtains the CAN information of the vehicle speed message sent by the vehicle controller, and then converts the vehicle speed message signal into a pulse voltage output in the form of a square wave of a certain frequency, and converts the message into a pulse signal output.

[0063] As an embodiment, water level sensors are installed in the heater expansion tank, the cooling system expansion tank, and the high-voltage battery liquid cooling water tank respectively. When the water level signal is lower than the threshold, the heater expansion tank water level low alarm signal, the cooling system expansion tank water level low alarm signal and / or the high-voltage battery liquid cooling water tank water level low alarm signal are input to the instrument, and the processor controls the display module of the instrument to display the alarm.

[0064] In this embodiment, the power module is the instrument power supply processing function, which is responsible for providing stable working power to each internal module after the external input 24V power is stabilized and transformed; the communication module is the instrument and external CAN communication module, which is responsible for receiving and processing external CAN information; the control module is the instrument output control, which outputs power and signals according to different needs; the input module includes a sensor unit, a general signal part, and a pure electric signal input part, which receives and processes external analog, switch and other signals; the processor is the instrument data processing core, which integrates and processes CAN information, input confidence, etc. according to different requirements; the display module includes a speedometer, a barometer, a tachometer, a motor temperature meter, a display LCD screen, etc., which intuitively displays the vehicle signal on the instrument panel.

[0065] The general signal input section includes ABS indication, ASR indication, emergency bonnet open, emergency valve open, low beam signal, high beam signal, center door open signal, front door open signal, seat belt unfastened signal, brake light signal, battery compartment temperature alarm, heater compartment temperature alarm, low fuel alarm, left turn signal, right turn signal, exit request indicator light, front fog light, rear fog light, low beam, left front shoe wear alarm, right front shoe wear alarm, left rear shoe wear alarm, right rear shoe wear alarm, door pump low pressure alarm, and parking brake indication. The communication section includes external CAN high, external CAN low, external CAN shield, external CAN termination resistor, internal CAN high, internal CAN low, internal CAN shield, and internal CAN termination resistor.

[0066] Example 2

[0067] This embodiment discloses a method for controlling a pure electric bus based on an instrument, which is based on the pure electric bus control system based on an instrument described in the first embodiment and includes the following steps:

[0068] S1. Obtain a high-voltage battery charging connection success message, a power status signal, and a device status signal of the pure electric bus.

[0069] S2. Generate a device control signal based on the power status signal and / or device status signal and the high-voltage battery charging connection success message and directly input it to the corresponding device.

[0070] Specifically, the air compressor is enabled when the processor receives the high-voltage message from the vehicle and judges the pressure of the air pressure sensor in the instrument input pin: if the air pressure is less than 6.9 bar, the control output pin of the control module outputs the enable working signal to make the air compressor work. When the dryer exhaust signal (exhaust when the vehicle air pressure is full) is received, the processor stops outputting the work enable signal after a delay of 15 seconds; if the air pressure is greater than 6.9 bar and there is no output signal, when the air compressor forced working signal is received, the control module forces the output to control the air compressor to work through the control output pin.

[0071] The logic of daytime running lights is:

[0072] (1) When the ignition power pin of the power module has an input, the processor immediately outputs an on electrical signal to the daytime running lights through the control output pin of the control module, and the daytime running lights turn on; when the ignition power is turned off, the opposite is true.

[0073] (2) When the processor obtains the low beam on signal, the processor outputs the off electrical signal to the daytime running lights through the control output pin of the control module; when the processor obtains the low beam off signal, the processor delays for 2 seconds and then outputs the off electrical signal to the daytime running lights through the control output pin of the control module.

[0074] (3) When the processor obtains the high beam on signal, the processor outputs the off electrical signal to the daytime running lights through the control output pin of the control module; when the processor obtains the high beam off signal, the processor delays for 2 seconds and then outputs the off electrical signal to the daytime running lights through the control output pin of the control module.

[0075] (4) When the processor obtains the front fog lamp on signal, the processor outputs the off electrical signal to the daytime running lights through the control output pin of the control module; when the processor obtains the front fog lamp off signal, the processor immediately outputs the on electrical signal to the daytime running lights through the control output pin of the control module.

[0076] (5) When the processor obtains the double flash alarm wake-up signal, it stops outputting the daytime running light on signal and simultaneously activates the double flash lights displayed in the instrument display module to light up.

[0077] (6) When the processor receives the turn signal on signal, it outputs an off signal to the daytime running lights through the control output pin of the control module. When the processor receives the turn signal off signal, it immediately outputs an on signal to the daytime running lights through the control output pin of the control module, thereby effectively controlling the daytime running lights. This pin is controlled by the instrument panel and can replace a separate daytime running light controller, effectively reducing the cost of the entire vehicle.

[0078] When the 24V mains voltage is on and the switch power is off, the processor receives a front door open signal and outputs a 15-second nighttime light activation signal through the control module's control output pin before disconnecting power. This ensures the driver's area remains illuminated for 15 seconds when exiting the vehicle, ensuring safety. This pin replaces a separate lighting controller, reducing costs while improving safety and controllability, effectively meeting user-friendly requirements.

[0079] It also includes a driver leaving seat alarm. When the processor obtains the vehicle high-voltage message + gear message sent by the vehicle controller, if the processor obtains the driver leaving seat signal, the processor controls the built-in buzzer of the instrument to alarm and controls the display module to display the driver leaving the seat sign.

[0080] Water level sensors are installed in the heater expansion tank, cooling system expansion tank and high-voltage battery liquid cooling water tank respectively. When the water level signal is lower than the threshold, the heater expansion tank water level low alarm signal, the cooling system expansion tank water level low alarm signal and / or the high-voltage battery liquid cooling water tank water level low alarm signal are input to the instrument, and the processor controls the instrument's display module to display the alarm.

[0081] Example 3

[0082] A third embodiment of the present invention provides a pure electric bus, including the instrument-based pure electric bus control system described in the first embodiment or executing the instrument-based pure electric bus control method described in the second embodiment.

[0083] The descriptions of the various embodiments in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. The instrument-based pure electric bus control system is characterized by: include: An instrument having a built-in processor and a control module, wherein the processor is in communication with a battery management system to obtain a high-voltage battery charging connection success message; a power supply module, the power supply module being electrically connected to the instrument so that the processor obtains a power status signal of the pure electric bus; The processor is electrically connected to the sensor unit to directly obtain the device status signal collected by the sensor unit, and generates a device control signal according to the power status signal and / or the device status signal and the high-voltage battery charging connection success message, and outputs it to the control module. The control module directly inputs the device control signal to the corresponding device; The power supply includes a 24V constant voltage, a switching power supply, an ignition power supply, a charging power supply and a ground wire. The sensor unit includes a first air pressure sensor and a second air pressure sensor. The first air pressure sensor is provided on the air compressor, and the second air pressure sensor is provided on the rear axle brake air reservoir. The generating of a device control signal according to the power state signal and the device state signal and outputting the signal to the control module, wherein the control module directly inputs the device control signal to the corresponding device, comprises: When the ignition power pin of the power module obtains an input electrical signal, the processor outputs a daytime running light on signal through the control module; When the processor obtains a low beam on signal, a high beam on signal, a front fog light on signal, a hazard warning wake-up signal, or a turn signal start signal, the processor stops outputting a daytime running light on signal; When the processor obtains a low beam off signal, a high beam off signal, a front fog light off signal or a turn signal off signal, the processor outputs a daytime running light on signal through the control module after a preset time threshold.

2. The instrument-based pure electric bus control system according to claim 1, characterized in that: The generating of a device control signal according to the power state signal and the device state signal and outputting the signal to the control module, wherein the control module directly inputs the device control signal to the corresponding device, comprises: When the charging power pin of the power module obtains an input electrical signal and the processor obtains a high-voltage battery charging connection success message, it sends a vehicle information message to the vehicle CAN network and controls the display module to display the charging status; When the charging power pin of the power module obtains an input electrical signal and the processor does not obtain a high-voltage battery charging connection success message, a vehicle information message is sent to the vehicle CAN network to implement vehicle self-test; After the processor obtains the high-voltage message from the vehicle, it obtains the air pressure of the air compressor. When the air pressure is less than the preset working threshold, the control module sends an enable signal to the air compressor. If the dryer exhaust signal is obtained at the same time, the control module outputs the enable signal to the air compressor after a delay of the preset time threshold. When the processor obtains the forced working signal of the air compressor, it sends an enabling working signal to the air compressor through the control module.

3. The instrument-based pure electric bus control system according to claim 1, characterized in that: The sensor unit further includes a fuel quantity sensor, which is arranged in the fuel heating main engine tank and is electrically connected to the processor.

4. The instrument-based pure electric bus control system according to claim 3, characterized in that: The generating of a device control signal according to the power state signal and the device state signal and outputting the signal to the control module, wherein the control module directly inputs the device control signal to the corresponding device further comprises: When the processor obtains the fuel quantity signal, the control display module displays the fuel symbol.

5. The instrument-based pure electric bus control system according to claim 1, characterized in that: The generating of a device control signal according to the power state signal and the device state signal and outputting the signal to the control module, wherein the control module directly inputs the device control signal to the corresponding device, comprises: When the 24V normal power is on and the switch power is off, the processor obtains the front door opening signal and outputs the night light start signal via the control module within a preset time period.

6. The instrument-based pure electric bus control system according to claim 1, characterized in that: The processor acquires a vehicle speed signal and converts the vehicle speed signal into a pulse signal.

7. A pure electric bus control method based on an instrument, based on the pure electric bus control system based on an instrument according to any one of claims 1 to 6, characterized in that: include: Obtain high-voltage battery charging connection success message, pure electric bus power status signal and device status signal; According to the power status signal and / or device status signal and the high-voltage battery charging connection success message, a device control signal is generated and directly input to the corresponding device.

8. A pure electric bus, characterized in that: The invention comprises the instrument-based pure electric bus control system according to any one of claims 1 to 6 or executes the instrument-based pure electric bus control method according to claim 7.

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