A method and device for protecting the start of an excavator engine and a piece of engineering equipment

Abstract

The present application belongs to the technical field of hydraulic excavator engine starting control, and relates to an excavator engine starting protection method, device and engineering machinery, comprising: obtaining the battery voltage, starting motor temperature, engine speed and starting signal of the ignition switch of the engine; when the starting signal indicates starting, determining whether the starting is abnormal based on the battery voltage, starting motor temperature, duration of both and engine speed, and controlling the starting motor power to be disconnected after determining that the starting is abnormal; if the starting abnormality condition is not met, the starting motor receives the starting signal output by the controller and drives the engine to rotate to realize engine starting. According to the signals such as battery voltage, starting motor temperature and engine speed, the present application limits the starting duration and starting interval time, prevents the starting motor from overheating, achieves the purpose of protecting the starting motor and improves the reliability of the product.

Description

Technical Field

[0001] This invention relates to a method, device, and engineering machinery for protecting the starting of an excavator engine, belonging to the field of hydraulic excavator engine starting control technology. Background Technology

[0002] When starting an excavator, the starting time and intervals need to be manually controlled by the operator. Especially when starting multiple times consecutively, improper control can easily cause the starter motor to overheat and be damaged. In existing solutions, the operator manually controls the duration of the excavator's start switch (key switch or start button), and there is no required time interval between consecutive starts. Operator operation may result in excessively long starting times or excessively short intervals between starts, causing the starter motor to overheat and be damaged. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a method and control system for protecting the starting of an excavator engine. The system determines the interval between the next start based on the duration of the previous start, setting a reasonable start interval to avoid overheating and damage to the starter motor caused by frequent starts.

[0004] To solve this problem, the technical solution adopted by the present invention is as follows:

[0005] A method for protecting the starting power of a hydraulic excavator includes:

[0006] Acquire the engine's battery voltage, starter motor temperature, engine speed, and ignition switch start signal;

[0007] When the start signal indicates a start, the system determines whether there is a start-up abnormality based on the battery voltage, starter motor temperature, the duration of both, and engine speed. If the start-up abnormality is determined, the starter motor power is disconnected.

[0008] If the abnormal starting conditions are not met, the starter motor receives the start signal output by the controller and drives the engine to rotate to start the engine.

[0009] Furthermore, the startup exception includes:

[0010] The battery voltage is below the voltage threshold and the duration exceeds the first time threshold;

[0011] The motor temperature is higher than the temperature threshold and the duration is greater than the second time threshold.

[0012] The engine speed is greater than the speed threshold.

[0013] Furthermore, if the engine speed exceeds the speed threshold, the start signal should not be output again.

[0014] Furthermore, if the engine speed is less than the speed threshold, when the start signal indicates that it is not the first start, the starter motor working time is collected as the start duration, and the time between the time of the non-first start and the time of the last start is collected as the start interval time; based on the start duration and the start interval time, it is determined whether the start interval is abnormal, and after determining that the start interval is abnormal, the motor power supply is disconnected.

[0015] Furthermore, the abnormal startup interval includes:

[0016] If the startup duration is less than the short startup time threshold and the startup interval is less than the short startup interval time threshold;

[0017] If the startup duration is greater than the short startup time threshold but less than the long startup time threshold, and the startup interval is less than the long startup interval time threshold;

[0018] If the startup duration is greater than the startup time threshold for excessively long startup times, and the startup interval is less than the startup interval time threshold for excessively long startup times.

[0019] Furthermore, after determining that the start interval is abnormal, the motor power supply is disconnected and a start interval countdown is sent to the instrument. The instrument displays the start interval countdown. After the countdown ends, the motor power supply is started upon receiving a start signal.

[0020] Furthermore, if the startup abnormality is determined, a startup abnormality signal is sent to the instrument.

[0021] The present invention also provides a hydraulic excavator engine start-up protection device, comprising:

[0022] The acquisition module is used to acquire the engine's battery voltage, starter motor temperature, engine speed, and ignition switch start signal;

[0023] The determination module is used to determine whether there is a starting abnormality when the start signal indicates starting, based on the battery voltage, starter motor temperature and the duration of both, and to control the motor power supply to disconnect after determining that the starting abnormality is not met; if the starting abnormality conditions are not met, the starter motor receives the start signal output by the controller and drives the engine to rotate to start the engine.

[0024] Furthermore, this includes a starter switch, controller, instruments, engine, starter motor, temperature sensor, and battery;

[0025] The start switch is used by the driver to start the engine, and the start signal is connected to the controller.

[0026] The controller is used to receive the engine speed signal, the starter motor temperature signal collected by the temperature sensor, and the battery voltage signal, and to perform start-related logic operations and output start signals.

[0027] The instrument is used to display start-up prohibition information and start-up interval time, and communicates with the controller via CAN bus.

[0028] The engine and controller are connected via a CAN bus, and the engine speed information is sent to the controller in real time.

[0029] The starter motor receives the start signal output by the controller and drives the engine to rotate to start the engine;

[0030] The temperature sensor collects the temperature information of the starter motor in real time and transmits it to the controller.

[0031] The battery supplies power to the system and transmits voltage signals to the controller.

[0032] The present invention also provides an engineering machine that performs the above-described hydraulic excavator engine start-up protection method.

[0033] Beneficial effects

[0034] This invention, based on collected signals, prohibits engine starting when conditions such as battery voltage, starter motor temperature, and engine speed are not met. Engine start status is determined by engine speed; if the speed exceeds r1 (e.g., 400 rpm), the engine is considered started, and the starter motor power is automatically disconnected to prevent damage from a second attempt. The interval between the next start and the previous start is determined based on the duration of the previous start and displayed as a countdown timer on the instrument panel, making the interval more reasonable.

[0035] This invention limits the start-up duration and start-up interval based on signals such as battery voltage, starter motor temperature, and engine speed, thereby preventing the starter motor from overheating, protecting the starter motor, and improving product reliability. Attached Figure Description

[0036] Figure 1 For the electrical structure of the control system.

[0037] Figure 2 This is for starting the logic.

[0038] Figure 3 This is the logic for starting the interval time. Detailed Implementation

[0039] Example 1

[0040] This invention provides a method and control system for protecting the starting of a hydraulic excavator engine. When the operator starts the engine, the system collects signals such as battery voltage, starter motor temperature, and engine speed to limit the starting duration T. on and startup interval T off This prevents the starter motor from overheating, thus protecting the starter motor and improving product reliability.

[0041] The electrical structure diagram of the control system is as follows Figure 1 As shown. The control system includes a start switch, controller, instruments, engine, starter motor, temperature sensor, and battery. The start switch is used by the driver to start the engine, and the start signal is sent to the controller. The controller receives engine speed data, temperature signals from the starter motor collected by the temperature sensor, and voltage signals from the battery, and can perform start-related logic operations and output start signals. The instruments display start-prohibited information and start intervals, and communicate with the controller via a CAN bus. The engine and controller are connected via a CAN bus, and engine speed information is sent to the controller in real time. The starter motor receives the start signal output from the controller and drives the engine to rotate, thus starting the engine. The temperature sensor collects the starter motor's temperature information in real time and transmits it to the controller. The battery supplies power to the system and transmits voltage signals to the controller.

[0042] Startup logic as follows Figure 2 As shown, when the controller detects that the battery voltage is lower than the minimum operating voltage V1 (e.g., 20V) of the starter motor and remains lower than this voltage for a specific time t1 (e.g., 5S), the controller will prohibit the output of the start signal and send a "low voltage, prohibit start" signal to the instrument, which will display "low voltage, prohibit start".

[0043] When the controller detects that the starting motor temperature is higher than the normal operating temperature T1 (e.g., 80 degrees Celsius) and remains higher for a specific time t2 (e.g., 10 seconds), the controller will prohibit the output of the start signal and send a "Motor temperature high, start prohibited" signal to the instrument, which will display "Motor temperature high, start prohibited".

[0044] When starting under the premise that the battery voltage and starter motor temperature meet the starting conditions, when the controller detects that the engine speed is greater than a certain value r1 (such as 400 rpm), it automatically cuts off the starter motor power supply and terminates the starter motor operation; and when the engine speed is greater than the certain value r1 (such as 400 rpm), it is considered that the engine has started, and the controller prohibits the output of the start signal to prevent secondary starting.

[0045] Startup interval logic is as follows Figure 3 As shown, in a continuous short time (such as T) onWhen starting, the engine speed does not reach a specific speed r1 (such as 400 rpm), and the start interval time T off is less than t31 (such as 4S). During the interval, the controller sends the start interval countdown to the instrument, and the instrument displays the start interval countdown. After the countdown ends, when the start signal is received, the power supply of the start motor is turned on, so that each start interval time T off is guaranteed to be above t31 (such as 4S);

[0046] During continuous long time (such as t3 ≤ T on When starting, the engine speed does not reach a specific speed r1 (such as 400 rpm), and the start interval time T off is less than t41 (such as 60S). During the interval, the controller sends the start interval countdown to the instrument, and the instrument displays the start interval countdown. After the countdown ends, when the start signal is received, the power supply of the start motor is turned on, so that each start interval time T off is guaranteed to be above t41 (such as 60S);

[0047] During extremely long time (such as t4 ≤ T on ) When starting, and the engine speed does not reach a specific speed r1 (such as 400 rpm), the start interval time T off is less than t51 (such as 120S). During the interval, the controller sends the start interval countdown to the instrument, and the instrument displays the start interval countdown. After the countdown ends, when the start signal is received, the power supply of the start motor is turned on, so that each start interval time T off is guaranteed to be above t51 (such as 120S).

[0048] After the technical solution of the present invention is applied to XCMG XE215CB hydraulic excavator, the problem that the start motor is easily damaged is solved. The technical solution of the present invention restricts the start duration and start interval time according to signals such as battery voltage, start motor temperature, engine speed, etc., prevents the start motor from overheating, achieves the purpose of protecting the start motor, and improves the reliability of the product.

[0049] Explanation of related terms:

[0050] Start duration T on : The working time of the start motor.

[0051] Start interval time T off : The interval time between two consecutive starts of the engine.

Claims

1. A method for protecting the starting power of a hydraulic excavator engine, characterized in that, include: Acquire the engine's battery voltage, starter motor temperature, engine speed, and ignition switch start signal; When the start signal indicates a start, the system determines whether there is a start-up abnormality based on the battery voltage, starter motor temperature, the duration of both, and engine speed. If the start-up abnormality is determined, the starter motor power is disconnected. If the abnormal starting conditions are not met, the starter motor receives the start signal output by the controller and drives the engine to rotate to start the engine; The startup exceptions include: The battery voltage is below the voltage threshold and the duration exceeds the first time threshold; The motor temperature is higher than the temperature threshold and the duration is greater than the second time threshold. The engine speed is greater than the speed threshold. If the engine speed is less than the speed threshold, when the start signal indicates that it is not the first start, the starter motor working time is collected as the start duration, and the time between the time of the non-first start and the time of the last start is collected as the start interval time; based on the start duration and the start interval time, it is determined whether the start interval is abnormal, and after determining that the start interval is abnormal, the motor power supply is disconnected.

2. The hydraulic excavator engine start-up protection method according to claim 1, characterized in that, If the engine speed is greater than the speed threshold, the start signal should not be output again.

3. The hydraulic excavator engine start-up protection method according to claim 1, characterized in that, The abnormal startup interval includes: If the startup duration is less than the short startup time threshold and the startup interval is less than the short startup interval time threshold; If the startup duration is greater than the short startup time threshold but less than the long startup time threshold, and the startup interval is less than the long startup interval time threshold; If the startup duration is greater than the startup time threshold for excessively long startup times, and the startup interval is less than the startup interval time threshold for excessively long startup times.

4. The hydraulic excavator engine start-up protection method according to claim 1, characterized in that, Once the abnormal start interval is confirmed, the motor power is disconnected and a start interval countdown is sent to the instrument. The instrument displays the start interval countdown. After the countdown ends, the motor power is started upon receiving a start signal.

5. The hydraulic excavator engine start-up protection method according to claim 1, characterized in that, If the startup abnormality is determined, a startup abnormality signal is sent to the instrument.

6. A hydraulic excavator engine start-up protection device, characterized in that, The apparatus performs the method of claim 1, the apparatus comprising: The acquisition module is used to acquire the engine's battery voltage, starter motor temperature, engine speed, and ignition switch start signal; The determination module is used to determine whether there is a starting abnormality when the start signal indicates starting, based on the battery voltage, starter motor temperature and the duration of both, and to control the motor power supply to disconnect after determining that the starting abnormality is not met; if the starting abnormality conditions are not met, the starter motor receives the start signal output by the controller and drives the engine to rotate to start the engine.

7. A hydraulic excavator engine start-up protection device, characterized in that, The device performs the method of claim 1, and the device includes a start switch, a controller, an instrument, an engine, a starter motor, a temperature sensor, and a battery; The start switch is used by the driver to start the engine, and the start signal is connected to the controller. The controller is used to receive the engine speed signal, the starter motor temperature signal collected by the temperature sensor, and the battery voltage signal, and to perform start-related logic operations and output start signals. The instrument is used to display start-up prohibition information and start-up interval time, and communicates with the controller via CAN bus. The engine and controller are connected via a CAN bus, and the engine speed information is sent to the controller in real time. The starter motor receives the start signal output by the controller and drives the engine to rotate to start the engine; The temperature sensor collects the temperature information of the starter motor in real time and transmits it to the controller. The battery supplies power to the system and transmits voltage signals to the controller.

8. An engineering machinery, characterized in that, The engineering machinery includes the device described in claim 6 or 7.

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