A starter overrun protection method based on identifying battery type and triggering protection

Abstract

The present invention provides a starter overrun protection method based on identifying the battery type to trigger protection, adopts an innovative overrun protection function judgment method, by collecting the voltage information of the relay 50C terminal, firstly identifying the battery type, and then implementing targeted multiple sampling and judgment according to different types of batteries, thereby optimizing the judgment process of the overrun protection function, which significantly improves the accuracy of the overrun protection function, avoids false triggering of the overrun protection function, and ensures reliable starting and timely protection of the starter.

Description

Technical Field

[0001] The invention relates to the technical field of starters, and in particular to a starter overriding protection method based on identifying battery types and triggering protection. Background Art

[0002] The starter is an important component in the automobile starting system. Its main function is to start the engine by controlling the internal meshing device through the electromagnetic switch. The overrunning state of the starter refers to a mechanism in which the one-way clutch is in an overrunning state when the drive gear of the starter is reversely dragged by the flywheel ring gear and the speed of the drive gear is greater than the speed of the motor, thereby protecting the armature from damage. The function of the one-way clutch is to allow the speed of the drive gear to exceed the speed of the armature after the engine is started to protect the armature from damage. When the engine is started, the speed of the drive gear will increase as the engine speed increases. At this time, if the starter still tries to drive the engine, it may cause damage to the armature. Through the design of the one-way clutch, when the speed of the drive gear exceeds the speed of the armature, it can allow the drive gear to rotate at a high speed and let the armature disengage from the reverse belt, thereby avoiding damage to the armature. This overrunning protection mechanism ensures the safe operation of the starter after the engine is started, and also protects the engine from unnecessary damage.

[0003] With the development of starter battery technology, commercial vehicles, especially heavy trucks, are gradually using lithium batteries or sodium batteries as starter batteries. Lithium batteries have the characteristics of large capacity, high initial voltage, and low voltage drop during the starting process. The high voltage of the battery may also trigger the anti-restart protection or trigger the override protection function in advance. The consequence of triggering the anti-restart function is that the engine cannot ignite and cannot be started; the premature triggering of the override protection function means that the engine is driven by the starter, and stops before or after the successful start, making it impossible to start. Summary of the invention

[0004] The present invention aims to solve the technical problem in the prior art that the starter cannot start because the overriding protection function is mistakenly triggered by the high voltage of the battery, and provides a starter overriding protection method based on identifying the battery type to trigger the protection.

[0005] The present invention is implemented as follows: a starter overriding protection method based on identifying battery type triggering protection, comprising the following judgment steps:

[0006] Step 1: The protection circuit collects the voltage U1 at the C terminal of the relay 50; if U1 < 25.3V, it is judged to be an ordinary lead-acid battery, and then step 2 is performed; if U1 ≥ 25.3V, it is judged to be a new type of battery, and then step 3 is performed;

[0007] Step 2: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after the start is successful, the voltage U1 at the relay 50C terminal will gradually increase. When the detection voltage U1>24V, 30 sampling cycles are performed continuously. The voltage of each sampling is greater than the previous sampling voltage, and each sampling voltage U1 is>24V, then the overrun protection function is triggered, and the relay and electromagnetic switch are automatically turned off and the starter stops working; if one sampling voltage U1 is less than 24V, the sampling cycle count will be restarted;

[0008] Step 3: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after successful starting, the voltage U1 at the relay 50C terminal will gradually increase. When the detected voltage U1 is greater than 25V, 80 sampling cycles are performed continuously. If the voltage of each sampling is greater than the previous sampling voltage and each sampling voltage U1 is greater than 25V, the relay and the electromagnetic switch will be automatically turned off and the starter will stop working. If one sampling voltage U1 is less than 25V, the sampling cycle counting will be restarted.

[0009] Furthermore, if the voltage U1 at the C terminal of the relay 50 does not satisfy the judgment step all the time, that is, the Star gear is continuously in the on state, when the relay is continuously energized for 30 seconds, the control circuit forces the relay to be deenergized.

[0010] On the other hand, a starter overriding protection method based on identifying the battery type to trigger protection includes the following judgment steps:

[0011] Step 1: The protection circuit collects the voltage U1 at the C terminal of the relay 50; if U1 < 25.3V, it is judged to be an ordinary lead-acid battery, and then step 2 is performed; if U1 ≥ 25.3V, it is judged to be a new type of battery, and then step 3 is performed;

[0012] Step 2: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after the start is successful, the voltage U1 at the relay 50C terminal will gradually increase. When the detection voltage U1>24V, 30 sampling cycles are performed continuously. The voltage of each sampling is greater than the previous sampling voltage, and each sampling voltage U1 is>24V, then the overrun protection function is triggered, and the relay and electromagnetic switch are automatically turned off and the starter stops working; if one sampling voltage U1 is less than 24V, the sampling cycle count will be restarted;

[0013] Step 3: Continue to detect the voltage U1 at the relay 50C terminal. After successful starting, if the Star gear is still in the on state, the voltage U1 at the relay 50C terminal will gradually increase; when the detected voltage U1 is greater than 25.6V, perform 30 sampling cycles in succession. If each sampling voltage is greater than the previous sampling voltage and each sampling voltage U1 is greater than 25.6V, the relay and the electromagnetic switch will be automatically turned off and the starter will stop working; if one sampling voltage U1 is less than 25.6V, the sampling cycle counting will be restarted.

[0014] Furthermore, if the voltage U1 at the C terminal of the relay 50 does not satisfy the judgment step all the time, that is, the Star gear is continuously in the on state, when the relay is continuously energized for 30 seconds, the control circuit forces the relay to be deenergized.

[0015] The advantages of the present invention are: the starter override protection method based on identifying the battery type to trigger protection adopts an innovative override protection function judgment method. By collecting the voltage information of the relay 50C terminal, the battery type is first identified, and then targeted multiple sampling and analysis are implemented according to different types of batteries, thereby optimizing the judgment process of the override protection function. This significantly improves the accuracy of the override protection function, avoids false triggering of the override protection function, and ensures reliable starting and timely protection of the starter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0017] Figure 1 It is a circuit diagram of embodiment 1 of the present invention.

[0018] Figure 2 It is a flow chart of the starter overrun protection method in the second embodiment of the present invention.

[0019] Figure 3 It is a flow chart of the starter overrun protection method in the third embodiment of the present invention.

[0020] Figure 4 This is a waveform diagram of the overrun protection function verified using a Leoch 330Ah lead-acid battery.

[0021] Figure 5 This is a waveform diagram of the Camel 180Ah lead-acid battery used to verify the overrun protection function.

[0022] Figure 6 This is a waveform diagram of verifying the overrun protection function when a 200Ah lithium battery is fully charged.

[0023] Figure 7 This is a waveform diagram of the overrun protection function verified under low voltage state using a 135Ah lithium battery.

[0024] Relay 1, electromagnetic switch 2, holding coil 21, pull coil 22, battery 3, motor 4, electric lock door 5. DETAILED DESCRIPTION

[0025] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Embodiment 1

[0026] See also Figure 1 As shown, this embodiment provides a starter, including a relay 1, an electromagnetic switch 2, a battery 3, a motor 4, and a protection circuit. The output end of the motor 4 is equipped with a driving gear for meshing with the flywheel ring gear of the engine. The protection circuit is installed on the relay 1; the 50C terminal is connected to the battery 3 through the electric lock door 5 and is connected to the relay 1; the electromagnetic switch 2 has a 30 terminal and a 50 terminal, and the 30 terminal is connected to the battery 5; the positive terminal of the relay 1 is connected to the 50C terminal, and the negative terminal is grounded through the protector; the positive terminal of the relay contact is connected to the 30 terminal, and the negative terminal is connected to the 50 terminal; the electromagnetic switch 2 also includes a holding coil 21 and a pull-in coil 22, and the 50 terminal is connected to the positive terminal of the pull-in coil 22 and the positive terminal of the holding coil 21 respectively.

[0027] In this embodiment, the protection circuit is composed of the following modules: an electronic chip with a program package, a top gear state detection module, an overvoltage detection module, and a delayed power-off control module. The top gear state detection module is used to implement the top gear protection function, the overvoltage detection module is used to implement the overvoltage protection function, and the delayed power-off control module is used to implement the delayed protection function. Embodiment 2

[0028] See also Figure 2 As shown, this embodiment provides a starter overriding protection method based on identifying the battery type to trigger protection, comprising the following steps:

[0029] Step 1: The protection circuit collects the voltage U1 at the terminal of relay 50C; if U1 is less than 25.3V, it is judged as an ordinary lead-acid battery, and then step 2 is performed; if U1 is greater than or equal to 25.3V, it is judged as a new type of battery, and then step 3 is performed. According to the implementation standard GB / T 5008 for ordinary lead-acid batteries, the rated voltage of a 24V system lead-acid battery is usually 25.6V. In actual use, before starting, there are already electrical appliances such as instrument panels and oil pumps working, which will produce a certain voltage drop. Therefore, when the starter is working, its terminal voltage is usually not greater than 25.3V, so 25.3V is used as the dividing point to judge the battery type. As for new batteries such as lithium batteries and sodium batteries, there is no implementation standard in the industry at present, and the rated voltage is usually also nominally 25.6V, but the actual voltage is usually greater than 27V, and some even reach 29.2V.

[0030] Step 2: Before the start is successful, there will be a large voltage drop at the relay 50C terminal. Continue to detect the voltage U1 at the relay 50C terminal. After the start is successful, if the Star gear is still in the on state, the voltage U1 at the relay 50C terminal will gradually increase. When the detection voltage U1>24V, 30 sampling cycles are performed continuously. The voltage of each sampling is greater than the previous sampling voltage, and each sampling voltage U1 is>24V, then the overrun protection function is triggered, and the relay and electromagnetic switch are automatically turned off and the starter is stopped; if one of the sampling voltage U1 is less than 24V, the sampling cycle count will be restarted.

[0031] Step 3: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after successful starting, the voltage U1 at the relay 50C terminal will gradually increase. When the detected voltage U1 is greater than 25V, 80 sampling cycles are performed continuously. If the voltage of each sampling is greater than the previous sampling voltage and each sampling voltage U1 is greater than 25V, the relay and the electromagnetic switch will be automatically turned off and the starter will stop working. If one sampling voltage U1 is less than 25V, the sampling cycle counting will be restarted.

[0032] Preferably, if the voltage U1 at the C terminal of the relay 50 does not satisfy the judgment step all the time, that is, the Star gear is continuously in the on state, when the relay is continuously energized for 30 seconds, the control circuit forces the relay to be de-energized.

[0033] Preferably, in this embodiment, the maximum time for delayed release of the starter relay 1 is set to 30S.

[0034] The present embodiment is a starter override protection method based on identifying the battery type to trigger protection, which adopts an innovative override protection function judgment method. By collecting the voltage information at the relay 50C terminal, the battery type is first identified, and then targeted multiple sampling and analysis are implemented according to different types of batteries, thereby optimizing the judgment process of the override protection function. This significantly improves the accuracy of the override protection function, avoids false triggering of the override protection function, ensures reliable starting and timely protection of the starter, and overcomes the shortcomings of the prior art in protecting different types of batteries.

[0035] The overrun protection method of this embodiment is that when it is determined that the starter has driven the engine to start and is in an overrun state, the starter protection circuit triggers the protection function and disconnects the relay 1 circuit in time, thereby stopping the starter from working. Embodiment 3

[0036] See also Figure 3 As shown, this embodiment provides a starter overriding protection method based on identifying the battery type to trigger protection, including the following judgment steps:

[0037] Step 1: The protection circuit collects the voltage U1 at the terminal of relay 50C; if U1 is less than 25.3V, it is judged as an ordinary lead-acid battery, and then step 2 is performed; if U1 is greater than or equal to 25.3V, it is judged as a new type of battery, and then step 3 is performed. According to the implementation standard GB / T 5008 for ordinary lead-acid batteries, the rated voltage of a 24V system lead-acid battery is usually 25.6V. In actual use, before starting, there are already electrical appliances such as instrument panels and oil pumps working, which will produce a certain voltage drop. Therefore, when the starter is working, its terminal voltage is usually not greater than 25.3V, so 25.3V is used as the dividing point to judge the battery type. As for new batteries such as lithium batteries and sodium batteries, there is no implementation standard in the industry at present, and the rated voltage is usually also nominally 25.6V, but the actual voltage is usually greater than 27V, and some even reach 29.2V.

[0038] Step 2: Before the start is successful, there will be a large voltage drop at the relay 50C terminal. Continue to detect the voltage U1 at the relay 50C terminal. After the start is successful, if the Star gear is still in the on state, the voltage U1 at the relay 50C terminal will gradually increase. When the detection voltage U1>24V, 30 sampling cycles are performed continuously. The voltage of each sampling is greater than the previous sampling voltage, and each sampling voltage U1 is>24V, then the overrun protection function is triggered, and the relay and electromagnetic switch are automatically turned off and the starter is stopped; if one of the sampling voltage U1 is less than 24V, the sampling cycle count will be restarted.

[0039] Step 3: Continue to detect the voltage U1 at the relay 50C terminal. After successful starting, if the Star gear is still in the on state, the voltage U1 at the relay 50C terminal will gradually increase.

[0040] When the detection voltage U1>25.6V, 30 sampling cycles are performed continuously. If each sampling voltage is greater than the previous sampling voltage and each sampling voltage U1 is>25.6V, the relay and electromagnetic switch are automatically turned off and the starter is stopped; if one sampling voltage U1 is less than 25.6V, the sampling cycle counting starts again.

[0041] Preferably, if the voltage U1 at the C terminal of the relay 50 does not satisfy the judgment step all the time, that is, U1 < 24V, and the Star gear is continuously in the on state, when the relay is continuously energized for 30s, the control circuit forces the relay to be deenergized.

[0042] Preferably, in this embodiment, the maximum time for delayed release of the starter relay 1 is set to 30S.

[0043] As another preferred embodiment, a starter override protection method based on identifying the battery type to trigger protection in this embodiment adopts an innovative override protection function judgment method. By collecting the voltage information at the relay 50C terminal, the battery type is first identified, and then targeted multiple sampling and analysis are carried out according to different types of batteries, thereby optimizing the judgment process of the override protection function. This significantly improves the accuracy of the override protection function, avoids false triggering of the override protection function, ensures reliable starting and timely protection of the starter, and overcomes the shortcomings of the prior art in protecting different types of batteries.

[0044] The overrun protection method of this embodiment is that when it is determined that the starter has driven the engine to start and is in an overrun state, the starter protection circuit triggers the protection function and disconnects the relay 1 circuit in time, thereby stopping the starter from working.

[0045] Reference Figure 4 As shown in the figure, a Leoch 330Ah lead-acid battery is used to verify the overrun protection function. The voltage U1 = 25.2V at the relay 50C terminal is initially collected, which is less than 25.3V and is judged to be an ordinary lead-acid battery. When U1 rises back to > 24V, the overrun protection is triggered 0.3s later, and the reverse drag time is about 0.6s. The purple data curve represents the current value of the 30 terminal of the electromagnetic switch 2.

[0046] Reference Figure 5As shown, a Camel 180Ah lead-acid battery is used to verify the overrun protection function. The voltage U1 = 25.0V at the relay 50C terminal is initially collected, which is less than 25.3V. It is judged to be an ordinary lead-acid battery. The voltage in the overrun stage is still less than 24V, and the overrun protection is not triggered. The reverse drag time is about 1.1s. The purple data curve represents the current value of the 30 terminal of the electromagnetic switch 2.

[0047] Reference Figure 6 As shown in the figure, the overrun protection function is verified with a 200Ah lithium battery in full charge. The voltage U1 = 28.4V at the relay 50C terminal is initially collected, which is greater than 25.3V, and is judged to be a new type of battery. When U1 rises back to > 25V, the overrun protection is triggered 0.8s later, and the reverse drag time is about 0.25s. The purple data curve represents the current value at the 30 terminal of the electromagnetic switch 2.

[0048] Reference Figure 7 As shown, the overrun protection function is verified under low voltage state using a 135Ah lithium battery. The voltage U1 = 25.7V at the relay 50C terminal is initially collected, which is greater than 25.3V, and is judged to be a new type of battery. When U1 rises back to > 25V, the overrun protection is triggered 0.8s later, and the reverse drag time is about 0.8s. The purple data curve represents the current value of the 30 terminal of the electromagnetic switch 2.

[0049] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A starter overrun protection method based on identifying battery type and triggering protection, characterized in that: The judgment steps include the following: Step 1: The protection circuit collects the voltage U1 at the C terminal of the relay 50; If U1 is less than 25.3V, it is judged as an ordinary lead-acid battery, and step 2 is performed subsequently; if U1 is greater than or equal to 25.3V, it is judged as a new type of battery, and step 3 is performed subsequently; if the voltage U1 at the C terminal of the relay 50 does not always meet the judgment step, that is, the Star gear is continuously in the on state, when the relay is continuously energized for 30s, the control circuit forces the relay to be deenergized; Step 2: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after the start is successful, the voltage U1 at the relay 50C terminal will gradually increase. When the detection voltage U1>24V, 30 sampling cycles are performed continuously. The voltage of each sampling is greater than the previous sampling voltage, and each sampling voltage U1 is>24V, then the overrun protection function is triggered, and the relay and electromagnetic switch are automatically turned off and the starter stops working; if one sampling voltage U1 is less than 24V, the sampling cycle count will be restarted; Step 3: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after successful starting, the voltage U1 at the relay 50C terminal will gradually increase. When the detected voltage U1 is greater than 25V, 80 sampling cycles are performed continuously. If the voltage of each sampling is greater than the previous sampling voltage and each sampling voltage U1 is greater than 25V, the relay and the electromagnetic switch will be automatically turned off and the starter will stop working. If one sampling voltage U1 is less than 25V, the sampling cycle counting will be restarted.

2. A starter overrun protection method based on identifying the battery type to trigger protection, characterized in that: The judgment steps include the following: Step 1: The protection circuit collects the voltage U1 at the C terminal of the relay 50; If U1 is less than 25.3V, it is judged as an ordinary lead-acid battery, and step 2 is performed subsequently; if U1 is greater than or equal to 25.3V, it is judged as a new type of battery, and step 3 is performed subsequently; if the voltage U1 at the C terminal of the relay 50 does not always meet the judgment step, that is, the Star gear is continuously in the on state, when the relay is continuously energized for 30s, the control circuit forces the relay to be deenergized; Step 2: Continue to detect the voltage U1 at the relay 50C terminal. If the Star gear is still in the on state after the start is successful, the voltage U1 at the relay 50C terminal will gradually increase. When the detection voltage U1>24V, 30 sampling cycles are performed continuously. The voltage of each sampling is greater than the previous sampling voltage, and each sampling voltage U1 is>24V, then the overrun protection function is triggered, and the relay and electromagnetic switch are automatically turned off and the starter stops working; if one sampling voltage U1 is less than 24V, the sampling cycle count will be restarted; Step 3: Continue to detect the voltage U1 at the relay 50C terminal. After successful starting, if the Star gear is still in the on state, the voltage U1 at the relay 50C terminal will gradually increase; when the detected voltage U1 is greater than 25.6V, perform 30 sampling cycles in succession. If each sampling voltage is greater than the previous sampling voltage and each sampling voltage U1 is greater than 25.6V, the relay and the electromagnetic switch will be automatically turned off and the starter will stop working; if one sampling voltage U1 is less than 25.6V, the sampling cycle counting will be restarted.

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