Multi-engine hybrid power mine car starting control method and system

Abstract

The invention discloses a multi-engine hybrid power mine car starting control method and system. The method comprises the following steps: detecting the state of a starting switch, and obtaining a lithium battery SOC value; under the condition that the starting switch is in the closed state, the starting mode of the engine is determined according to the SOC value of the lithium battery and a preset SOC threshold value; when the starting mode of the engine is a starting motor sequential starting mode, the main controller controls the ith starting relay to be closed so as to switch on the storage battery and the starting motor correspondingly connected with the ith starting relay, so that the ith starting motor drives the engine correspondingly connected with the ith starting motor to rotate, and meanwhile, the timer is triggered to time; reading the rotation speed of the ith engine; when the rotating speed of the ith engine is larger than the preset rotating speed threshold value, the main controller controls the ith starting relay to be switched off, and meanwhile the timer is reset and triggers timing again; when the timing time of the timer is larger than the preset waiting time, i is made to be equal to i + 1, and the step S3 is executed.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power mine cars, and in particular to a starting control method and system for a multi-engine hybrid power mine car. Background Art

[0002] For large-scale, high-power mining equipment, using a single high-power engine as the power system not only results in a large engine size and a complex system, but also has a long procurement cycle, a long manufacturing cycle, and high procurement and operating costs.

[0003] With the continuous development of electric control technology, the use of multiple low-power engines to replace a single high-power engine as a power system is more cost-effective while meeting functional requirements. At the same time, equipped with lithium batteries as energy storage elements to form hybrid power equipment is more energy-saving and environmentally friendly.

[0004] A common starting method for multiple engines is selective starting. This involves using a single starter key switch for each engine. This requires multiple key switches and results in a complex starting process. Even with single-button starting, there are issues such as some engines starting successfully while others fail. Hybrid mining vehicles also face the challenge of choosing between starting with a starter motor or an alternator. Therefore, a simpler and more reliable starting control method and system are needed to address these issues. Summary of the Invention

[0005] The present invention provides a multi-engine hybrid mine car starting control method and system to solve the problem that the prior art multi-engine starting control uses multiple starting switches for sequential starting, which has complex operation and tedious starting process.

[0006] According to one aspect of the present invention, a multi-engine hybrid mine car starting control method is provided, which is executed by a multi-engine hybrid mine car starting control system, the system including a main controller, a starting switch, n starting relays, m starting motors, a battery, s engines, p AC generators, an electric control cabinet, and a lithium battery, where n, m, s, and p are all integers greater than or equal to 3, and n=m=s=p; the method includes:

[0007] S1. Detect the start switch status and obtain the lithium battery SOC value;

[0008] S2. When the start switch is in a closed state, determining the engine starting mode according to the lithium battery SOC value and a preset SOC threshold;

[0009] S3. When the engine starting mode is the starter motor sequential starting mode, the main controller controls the ith starter relay to close, thereby connecting the battery and the starter motor connected to the ith starter relay, so that the ith starter motor drives the engine connected to the ith starter motor to rotate, and simultaneously triggers the timer to count and read the speed of the ith engine;

[0010] S4. When the i-th engine speed is greater than the preset speed threshold, the main controller controls the i-th starter relay to be disconnected, and the timer is reset and triggered again;

[0011] S5. When the timer timing time is greater than the preset waiting time, set i=i+1 and execute step S3; i is an integer greater than or equal to 1 and less than or equal to s.

[0012] Optionally, before S4, also includes:

[0013] Determine whether the i-th engine speed is greater than a preset speed threshold;

[0014] If the i-th engine speed is greater than the preset speed threshold, execute step S4;

[0015] If the i-th engine speed is less than or equal to the preset speed threshold, determine whether the timer timing is greater than the preset start time;

[0016] If the timer timing time is greater than the preset starting time, the main controller controls the i-th starting relay to be disconnected, the i-th engine is started successfully, the timer is reset and the timing step is triggered again;

[0017] If the timer timing time is less than or equal to the preset starting time, the process returns to the step of determining whether the i-th engine speed is greater than the preset speed threshold.

[0018] Optionally, determining the engine starting mode according to the lithium battery SOC value and a preset SOC threshold value includes:

[0019] Determining whether the SOC value of the lithium battery is greater than a first preset SOC threshold;

[0020] When the SOC value of the lithium battery is greater than a first preset SOC threshold, determining that the engine starting mode is an alternator starting mode;

[0021] When the SOC value of the lithium battery is less than or equal to a first preset SOC threshold, it is determined that the starting mode of the engine is a starter motor sequential starting mode.

[0022] Optionally, after determining that the engine starting mode is the alternator starting mode, the method further includes:

[0023] In the alternator starting mode, determining whether the SOC value of the lithium battery is greater than a second preset SOC threshold;

[0024] If yes, the main controller sends an "engine synchronous start command" to the electric control cabinet. After receiving the "engine synchronous start command", the electric control cabinet controls the p AC generators to rotate simultaneously to drive the s engines to rotate;

[0025] If not, it is determined whether the SOC value of the lithium battery is greater than a third preset SOC threshold and less than or equal to a second preset SOC threshold.

[0026] Optionally, after determining whether the SOC value of the lithium battery is greater than a third preset SOC threshold and less than or equal to a second preset SOC threshold, the method further includes:

[0027] If so, the main controller sends an "engine synchronization + hybrid start command" to the electric control cabinet. After receiving the "engine synchronization + hybrid start command", the electric control cabinet controls c of the p AC generators to rotate simultaneously to drive the corresponding engines to rotate, and controls pc and c AC generators to start sequentially to drive the corresponding engines to rotate, where c is an integer greater than or equal to 2 and less than p.

[0028] If not, it is determined whether the SOC value of the lithium battery is greater than a first preset SOC threshold and less than or equal to a third preset SOC threshold.

[0029] Optionally, after determining whether the SOC value of the lithium battery is greater than a first preset SOC threshold and less than or equal to a third preset SOC threshold, the method further includes:

[0030] If so, the main controller sends an "engine sequential start instruction" to the electric control cabinet. After receiving the "engine sequential start instruction", the electric control cabinet controls p AC generators to start sequentially to drive the corresponding engines to rotate.

[0031] Optionally, the second preset SOC threshold>the third preset SOC threshold>the first preset SOC threshold.

[0032] Optionally, the system further includes a display; and the method further includes:

[0033] When an engine fails to start, enter the start control page through the display to start a single engine independently.

[0034] According to another aspect of the present invention, a multi-engine hybrid mining car starting control system is provided, comprising a main controller, a starting switch, n starting relays, m starting motors, a battery, s engines, p AC generators, an electric control cabinet, and a lithium battery, wherein n, m, s, and p are all integers greater than or equal to 3, and n=m=s=p;

[0035] The main controller is respectively connected to the electric control cabinet, the lithium battery, n starting relays and the starting switch;

[0036] The n starting relays are respectively connected to the corresponding m starting motors, and the m starting motors are respectively connected to the corresponding s engines;

[0037] The batteries are connected to the m starting motors via n starting relays respectively;

[0038] The electric control cabinet is connected to the corresponding s engines through the p AC generators respectively;

[0039] The main controller is used to detect the start switch state and obtain the lithium battery SOC value;

[0040] The main controller is further configured to determine the engine starting mode according to the lithium battery SOC value and a preset SOC threshold value when the start switch is in a closed state;

[0041] The main controller is further configured to, when the engine starting mode is a starter motor sequential starting mode, control the ith starter relay to close, thereby connecting the battery and the starter motor corresponding to the ith starter relay, so that the ith starter motor drives the engine corresponding to the ith starter motor to rotate, and simultaneously trigger a timer to start timing and read the speed of the ith engine;

[0042] The main controller is further configured to control the i-th starter relay to disconnect when the i-th engine speed is greater than a preset speed threshold, and simultaneously reset the timer and trigger timing again;

[0043] The main controller is further configured to set i=i+1 and execute step S3 when the timer timing time is greater than the preset waiting time; i is an integer greater than or equal to 1 and less than or equal to s.

[0044] Optionally, the system further includes a display connected to the main controller;

[0045] The display is used to enter the start control page through the display to start a single engine independently when an engine fails to start.

[0046] An embodiment of the present invention provides a multi-engine hybrid mining car starting control method and system. The method includes: detecting the start switch state and obtaining the lithium battery SOC value; when the start switch is closed, determining the engine starting mode based on the lithium battery SOC value and a preset SOC threshold; when the engine starting mode is a starter motor sequential start mode, a main controller controls the i-th start relay to close, thereby connecting the battery and the starter motor connected to the i-th start relay, causing the i-th starter motor to drive the engine connected to the i-th starter motor, simultaneously triggering a timer and reading the i-th engine speed; when the i-th engine speed exceeds the preset speed threshold, the main controller controls the i-th start relay to open, simultaneously resetting the timer and triggering the timer again; when the timer time exceeds the preset waiting time, setting i = i + 1 and executing step S3, where i is an integer greater than or equal to 1 and less than or equal to s. In the technical solution provided by the embodiment of the present invention, the main controller determines whether to use the starter motor or the AC generator for starting based on the lithium battery SOC value. When starting with an AC generator, the lithium battery SOC value is further determined, resulting in three types of starting: synchronous, hybrid, and sequential. When starting with a starter motor, a sequential start method combined with a time delay is employed. Compared to the prior art starting method, which uses a single starter key switch for each engine, this invention utilizes a single starter switch for simpler starting. Furthermore, the invention utilizes both a starter motor and an AC generator, along with multiple starting modes, to improve the success rate of starting and provide more reliable starting for multi-engine hybrid mine vehicles.

[0047] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A flowchart of a multi-engine hybrid mining vehicle starting control method provided by an embodiment of the present invention;

[0050] Figure 2 A schematic structural diagram of a multi-engine hybrid mining vehicle starting control system provided by an embodiment of the present invention;

[0051] Figure 3A flowchart of another multi-engine hybrid mining vehicle starting control method provided by an embodiment of the present invention;

[0052] Figure 4 A flowchart of another multi-engine hybrid mining vehicle starting control method provided by an embodiment of the present invention;

[0053] Figure 5 A schematic diagram of an engine starting control page of a display in a multi-engine hybrid mining vehicle starting control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] Figure 1 This is a flow chart of a multi-engine hybrid mine car starting control method provided by an embodiment of the present invention. This embodiment is applicable to the starting control of multi-engine hybrid mine cars. The method can be executed by a multi-engine hybrid mine car starting control system. Figure 2 A schematic diagram of a multi-engine hybrid mine car starting control system provided by an embodiment of the present invention is shown in FIG. Figure 2 The system includes: a main controller 10, a starter switch 20, n starter relays 30, m starter motors 40, a battery 50, s engines 60, p AC generators 70, an electric control cabinet 80, and a lithium battery 90, where n, m, s, and p are all integers greater than or equal to 3, and n=m=s=p. The embodiment of the present invention is illustrated by taking three engines as an example. Figure 1, the method comprising:

[0057] S1. Detect the start switch status and obtain the lithium battery SOC value.

[0058] The starting switch may be a mechanical key switch or a mechanical push button switch.

[0059] Specifically, the main controller detects the start switch status and obtains the lithium battery SOC value. The start switch status determines whether a starting method is selected. When the start switch is closed, a starting method is selected; when the start switch is open, no starting method is selected. The lithium battery SOC value is an important basis for selecting the starting method, and it can be used to determine which starting method to use to start the engine.

[0060] S2. When the start switch is in the closed state, the engine starting mode is determined according to the lithium battery SOC value and the preset SOC threshold.

[0061] The preset SOC threshold can be set in advance based on experience or actual needs.

[0062] Specifically, when the start switch is in the closed state, the main controller determines the engine starting method based on the obtained lithium battery SOC value and the preset SOC threshold. For example, the relationship between the lithium battery SOC and the preset SOC threshold is determined. When the lithium battery SOC value is greater than the preset SOC threshold, the AC generator reverse drag starting method is adopted. When the lithium battery SOC value is less than or equal to the preset SOC threshold, the starter motor sequential starting method is adopted. When the AC generator reverse drag starting method is adopted, three starting modes are further subdivided, such as AC generator sequential starting, AC generator synchronous starting, and AC generator synchronous + sequential mixed starting. When the lithium battery SOC value is greater than the preset SOC threshold, the lithium battery SOC value is further compared with different preset SOC thresholds, and one of the above three starting modes can be selected.

[0063] S3. When the engine starting mode is the starter motor sequential starting mode, the main controller controls the i-th starter relay to close, so as to connect the battery and the starter motor corresponding to the i-th starter relay, so that the i-th starter motor drives the engine corresponding to the i-th starter motor to rotate, and at the same time triggers the timer to count and read the i-th engine speed.

[0064] For example, see Figure 2 , Figure 2Three engines are used as an example to illustrate that when the engine starting mode is the starter motor sequential starting mode, the main controller controls the first starter relay to close, so as to connect the battery and the starter motor 1 connected to the first starter relay, so that the first starter motor drives the engine 1 connected to the first starter motor to rotate, and at the same time triggers the timer to count and read the first engine speed.

[0065] S4. When the i-th engine speed is greater than the preset speed threshold, the main controller controls the i-th starter relay to be disconnected, and the timer is reset and triggered again.

[0066] The preset speed threshold may be set according to engine characteristics.

[0067] Specifically, after reading the first engine speed, the main controller compares it to a preset speed threshold. If the first engine speed exceeds the preset speed threshold, the main controller controls the first start relay to disconnect, indicating that the first engine has been successfully started. The timer is reset and triggered again to prepare for the start of the second engine. If the first engine speed still does not exceed the preset speed threshold within the set time, the main controller controls the first start relay to disconnect, indicating that the first engine has failed to start.

[0068] S5. When the timer timing time is greater than the preset waiting time, set i=i+1 and execute step S3; i is an integer greater than or equal to 1 and less than or equal to s.

[0069] The preset waiting time refers to the time after the first engine is started and the time after which the second engine is started. The time after which the second engine is started is the preset waiting time, which can be set in advance according to actual needs.

[0070] Specifically, after the timer is triggered, the timer duration is compared with a preset waiting time to determine whether the timer duration exceeds the preset waiting time. If the timer duration exceeds the preset waiting time, i is set to i + 1, indicating that the main controller controls the second starter relay to close, thereby connecting the battery and the starter motor 2 connected to the second starter relay, causing the second starter motor to drive the engine 2 connected to the second starter motor. Simultaneously, the timer is triggered and the second engine speed is read. After reading the second engine speed, the second engine speed is compared with a preset speed threshold. If the second engine speed exceeds the preset speed threshold, the main controller controls the second starter relay to open, indicating that the second engine has been successfully started. The timer is reset and the timer is triggered again to prepare for the start of the third engine. If the second engine speed still does not reach or exceed the preset speed threshold within the set time, the main controller controls the second starter relay to open, indicating that the second engine has failed to start. Similarly, after the second engine is started, the third engine can be started. Note that in sequential starting, the success or failure of the previous engine has no effect on the next engine. If an engine fails to start, the start switch must be reset or the entire electrical system must be powered off and restarted before another start using the start switch is permitted.

[0071] An embodiment of the present invention provides a multi-engine hybrid mining car starting control method and system. The method includes: detecting the start switch state and obtaining the lithium battery SOC value; when the start switch is closed, determining the engine starting mode based on the lithium battery SOC value and a preset SOC threshold; when the engine starting mode is a starter motor sequential start mode, a main controller controls the i-th start relay to close, thereby connecting the battery and the starter motor connected to the i-th start relay, causing the i-th starter motor to drive the engine connected to the i-th starter motor, simultaneously triggering a timer and reading the i-th engine speed; when the i-th engine speed exceeds the preset speed threshold, the main controller controls the i-th start relay to open, simultaneously resetting the timer and triggering the timer again; when the timer time exceeds the preset waiting time, setting i = i + 1 and executing step S3, where i is an integer greater than or equal to 1 and less than or equal to s. In the technical solution provided by the embodiment of the present invention, the main controller determines whether to use the starter motor or the AC generator for starting based on the lithium battery SOC value. When starting with an AC generator, the lithium battery SOC value is further determined, resulting in three types of starting: synchronous, hybrid, and sequential. When starting with a starter motor, a sequential start method combined with a time delay is employed. Compared to the prior art starting method, which uses a single starter key switch for each engine, this invention utilizes a single starter switch for simpler starting. Furthermore, the invention utilizes both a starter motor and an AC generator, along with multiple starting modes, to improve the success rate of starting and provide more reliable starting for multi-engine hybrid mine vehicles.

[0072] Figure 3 This is a flow chart of another multi-engine hybrid mining vehicle starting control method provided by an embodiment of the present invention. The embodiment of the present invention further refines the above embodiment based on the above embodiment. Figure 3 , the method comprising:

[0073] S10: Detect the start switch status and obtain the SOC value of the lithium battery.

[0074] S20: When the start switch is in the closed state, determine the engine starting mode according to the lithium battery SOC value and a preset SOC threshold.

[0075] S30. When the engine starting mode is the starter motor sequential starting mode, the main controller controls the ith starter relay to close, so as to connect the battery and the starter motor correspondingly connected to the ith starter relay, so that the ith starter motor drives the engine correspondingly connected to the ith starter motor to rotate, and at the same time triggers the timer to count and read the ith engine speed.

[0076] S40: Determine whether the i-th engine speed is greater than a preset speed threshold; if so, execute S50; if not, execute S60.

[0077] S50: The main controller controls the i-th starting relay to be disconnected, and at the same time the timer is reset and the timing is triggered again.

[0078] S60, determine whether the timer timing time is greater than the preset start time; if so, execute S50; if not, execute S40.

[0079] S70 , determining whether the timer timing is greater than the preset waiting time; if so, executing S80 ; if not, continuing to execute S70 .

[0080] S80, set i=i+1, and return to execute S30.

[0081] Figure 4 This is a flow chart of another multi-engine hybrid mining vehicle starting control method provided by an embodiment of the present invention. The embodiment of the present invention further refines the above embodiments based on the above embodiments. Figure 4 , the method comprising:

[0082] S110: Detect the start switch status and obtain the lithium battery SOC value.

[0083] S120 , determine whether the start switch is in a closed state; if so, execute S130 ; if not, execute S110 .

[0084] S130, determine whether the SOC value of the lithium battery is greater than a first preset SOC threshold; if so, execute S140; if not, execute S150.

[0085] The preset SOC thresholds include a first preset SOC threshold, a second preset SOC threshold, and a third preset SOC threshold. Optionally, the second preset SOC threshold > the third preset SOC threshold > the first preset SOC threshold. The first preset SOC threshold, the second preset SOC threshold, and the third preset SOC threshold can all be pre-set according to actual needs.

[0086] S140: Determine that the engine starting mode is an alternator starting mode.

[0087] S150: Determine that the engine starting mode is a starter motor sequential starting mode.

[0088] S160: Determine whether the SOC value of the lithium battery is greater than a second preset SOC threshold; if so, execute S170; if not, execute S180.

[0089] S170. The main controller sends an "engine synchronous start command" to the electric control cabinet. After receiving the "engine synchronous start command", the electric control cabinet controls the p AC generators to rotate simultaneously to drive the s engines to rotate.

[0090] Specifically, when the SOC value of the lithium battery is greater than the second preset SOC threshold, it indicates that the lithium battery has sufficient power to meet the simultaneous starting of multiple engines. The main controller sends an "engine synchronous start command" to the electronic control cabinet. After receiving the "engine synchronous start command", the electronic control cabinet controls p AC generators to rotate simultaneously to drive s engines to rotate. When the speed of an engine is greater than the preset speed threshold, the electronic control cabinet immediately controls the AC generator to stop rotating, which indicates that the engine has started successfully. If the engine speed still does not reach the set speed within the preset time, the electronic control cabinet immediately controls the corresponding AC generator to stop rotating, and the start fails. After the start fails, it is necessary to reset the start switch or power off and restart the entire electrical system before it is allowed to start again through the start switch.

[0091] S180, determine whether the SOC value of the lithium battery is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold; if so, execute S190; if not, execute S191.

[0092] S190. The main controller sends an "engine synchronization + hybrid start command" to the electronic control cabinet. After receiving the "engine synchronization + hybrid start command", the electronic control cabinet controls c of the p AC generators to rotate simultaneously to drive the corresponding engines to rotate, and controls pc and c AC generators to start sequentially to drive the corresponding engines to rotate, where c is an integer greater than or equal to 2 and less than p.

[0093] Specifically, when the lithium battery SOC value is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold, it indicates that the lithium battery power is insufficient to start multiple engines simultaneously, and a synchronous and sequential hybrid start method can be used. The main controller sends an "engine synchronous and hybrid start command" to the electronic control cabinet. Upon receiving this "engine synchronous and hybrid start command," the electronic control cabinet controls c of the p AC generators to rotate simultaneously, driving the corresponding engines, and controls pc and c AC generators to start sequentially, driving the corresponding engines.

[0094] For example, the main controller can send a "two engines start synchronously, and the third engine start sequentially" command to the electronic control cabinet. After receiving the command, the electronic control cabinet first controls the two AC generators to start the two engines simultaneously. After the two AC generators stop rotating, it controls the next AC generator to start the next engine. Similarly, if the speed of any engine is greater than the preset speed threshold, the electronic control cabinet immediately controls the AC generator to stop rotating, indicating that the start is successful. If the engine speed still does not reach the preset speed threshold within the preset time, the electronic control cabinet immediately controls the AC generator to stop rotating. If both engines fail to start within the preset time, or one succeeds and the other fails, it will not affect the sequential starting of the next engine. If an engine fails to start, it is necessary to reset the start switch or power off and restart the entire electrical system and then start it again using the start switch.

[0095] S191. Determine whether the SOC value of the lithium battery is greater than a first preset SOC threshold and less than or equal to a third preset SOC threshold; if so, execute S192; if not, end.

[0096] S192. The main controller sends an "engine sequential start instruction" to the electric control cabinet. After receiving the "engine sequential start instruction", the electric control cabinet controls p AC generators to start sequentially to drive the corresponding engines to rotate.

[0097] Specifically, when the lithium battery SOC value is greater than a first preset SOC threshold and less than or equal to a third preset SOC threshold, the lithium battery charge is insufficient to start both engines simultaneously, and a sequential start method is used. The main controller sends a command for sequentially starting multiple engines to the electrical control cabinet. Upon receiving the command, the electrical control cabinet first controls the first AC generator to start the first engine, then controls the second AC generator to start the second engine, and so on, starting the engines sequentially. Similarly, if the engine speed exceeds the preset speed threshold, the electrical control cabinet immediately controls the AC generator to stop, indicating a successful start. If the engine speed still does not reach the preset speed threshold within a preset time, the electrical control cabinet immediately controls the AC generator to stop. If an engine fails to start within the preset time, it will not affect the sequential start of the next engine. If an engine fails to start, the start switch must be reset or the entire electrical system must be powered off and restarted before another start using the start switch is allowed.

[0098] After S150 , S193 is executed.

[0099] S193. The main controller controls the ith starter relay to close, so as to connect the battery and the starter motor corresponding to the ith starter relay, so that the ith starter motor drives the engine corresponding to the ith starter motor to rotate, and at the same time triggers the timer to count and read the ith engine speed.

[0100] S194. Determine whether the i-th engine speed is greater than a preset speed threshold; if so, execute S195; if not, execute S196.

[0101] S195. The main controller controls the i-th starting relay to be disconnected, and at the same time the timer is reset and the timing is triggered again.

[0102] S196. Determine whether the timer timing is greater than the preset start time; if so, execute S195; if not, execute S194.

[0103] S197. Determine whether the timer timing is greater than the preset waiting time; if so, execute S198; if not, continue to execute S197.

[0104] S198. Set i=i+1 and return to execute S193.

[0105] Optionally, the system further includes a display; and the method further includes:

[0106] When an engine fails to start, enter the start control page through the display to start a single engine independently.

[0107] Specifically, if the engine fails to start after being started by the start switch, you can also enter the start control page through the display to start a single engine independently. In the start control page, each engine has two buttons corresponding to the starter motor start button and the alternator start button. Pressing the starter motor button will use the starter motor start mode, and pressing the alternator start button will use the alternator start mode. To avoid malfunction, when the engine speed is greater than the set speed, pressing the button will be ineffective and the engine has started prompt. For details, please refer to Figure 5 , Figure 5 A schematic diagram of an engine starting control page of a display in a multi-engine hybrid mining vehicle starting control system provided by an embodiment of the present invention.

[0108] In the technical solution provided by the embodiment of the present invention, the main controller determines whether to use a starter motor or an AC generator for starting based on the SOC value of the lithium battery. When starting with an AC generator, further judgment is made based on the SOC value of the lithium battery and is divided into three types: synchronous, mixed, and sequential starting. When starting with a starter motor, a sequential combined with delayed starting method is adopted. After a start failure, a single engine can also be started independently through the control page of the display. Compared with the selective starting method of equipping one engine with one start switch, the present invention is simpler to start with one start switch, and adopts two starting methods of a starter motor and an AC generator as well as multiple starting methods, thereby improving the success rate of starting and making the starting of multi-engine hybrid mine cars more reliable.

[0109] Continue to see Figure 2 , Figure 2 A schematic structural diagram of a multi-engine hybrid mine car starting control system provided in an embodiment of the present invention includes a main controller 10, a starting switch 20, n starting relays 30, m starting motors 40, a battery 50, s engines 60, p AC generators 70, an electric control cabinet 80, and a lithium battery 90, where n, m, s, and p are all integers greater than or equal to 3, and n = m = s = p.

[0110] The main controller 10 is respectively connected to the electric control cabinet 80, the lithium battery 90, n starting relays 30 and the starting switch 20; the n starting relays 30 are respectively connected to the corresponding m starting motors 40, and the m starting motors 40 are respectively connected to the corresponding s engines 60; the battery is respectively connected to the m starting motors through n starting relays; the electric control cabinet is respectively connected to the corresponding s engines through p AC generators.

[0111] Specifically, the start switch has two states: closed and open. The closed state sends a start command to the main controller. The main controller is hardwired to the start switch and detects the start switch state. The main controller is connected to the display, electrical control cabinet, and lithium battery, using a fieldbus for command and data exchange. The main controller is connected to start relays 1, 2, and 3, respectively, controlling the power supply and de-energization of start relays 1, 2, and 3, thereby controlling the starting of engines 1, 2, and 3.

[0112] Specifically, starter relays 1, 2, and 3 are connected to starter motors 1, 2, and 3, respectively. These motors are in turn connected to engines 1, 2, and 3, respectively. When starter motors 1, 2, and 3 rotate, they start engines 1, 2, and 3, respectively. A battery is connected to starter motors 1, 2, and 3 via starter relays 1, 2, and 3, respectively, providing power for starter motors 1, 2, and 3 when starting the engine. The electrical control cabinet is connected to engines 1, 2, and 3 via alternators 1, 2, and 3, respectively, controlling the rotation of alternators 1, 2, and 3 to start engines 1, 2, and 3, respectively. A lithium battery is connected to the electrical control cabinet and the main controller, storing the electrical energy converted by the alternators through the electrical control cabinet and discharging it to the alternators through the electrical control cabinet to cause them to rotate. The lithium battery transmits its remaining charge (SOC) value to the main controller in real time.

[0113] The main controller 10 is used to detect the start switch state and obtain the SOC value of the lithium battery.

[0114] The main controller 10 is further configured to determine the engine starting mode according to the lithium battery SOC value and a preset SOC threshold value when the start switch is in the closed state.

[0115] The main controller 10 is also used to control the ith starter relay to close when the engine starting mode is the starter motor sequential starting mode, so as to connect the battery and the starter motor corresponding to the ith starter relay, so that the ith starter motor drives the engine corresponding to the ith starter motor to rotate, and at the same time triggers the timer to count and read the ith engine speed.

[0116] The main controller is also used to control the i-th starting relay to be disconnected when the i-th engine speed is greater than a preset speed threshold, and the timer is reset and triggered again.

[0117] The main controller 10 is further configured to set i=i+1 and execute step S3 when the timer timing time is greater than the preset waiting time; i is an integer greater than or equal to 1 and less than or equal to s.

[0118] Continue to see Figure 2 Optionally, the system further includes a display 100, which is connected to the main controller 10; the display 100 is used to enter the start control page through the display to start a single engine independently when an engine fails to start.

[0119] Specifically, the display receives data from the main controller, displays the engine speed, lithium battery SOC value, battery voltage value, and prompts the status processes such as starting, waiting for starting, and starting failure.

[0120] A multi-engine hybrid mine car starting control system provided by an embodiment of the present invention can execute a multi-engine hybrid mine car starting control method provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects of the execution method.

[0121] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0122] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A multi-engine hybrid mining car starting control method, characterized in that: The method is performed by a multi-engine hybrid mining car starting control system, the system including a main controller, a starting switch, n starting relays, m starting motors, a battery, s engines, p AC generators, an electric control cabinet, and a lithium battery, where n, m, s, and p are all integers greater than or equal to 3, and n=m=s=p; the method includes: S1. Detect the start switch status and obtain the lithium battery SOC value; S2. When the start switch is in a closed state, determining the engine starting mode according to the lithium battery SOC value and a preset SOC threshold; S3. When the engine starting mode is the starter motor sequential starting mode, the main controller controls the ith starter relay to close, thereby connecting the battery and the starter motor connected to the ith starter relay, so that the ith starter motor drives the engine connected to the ith starter motor to rotate, and simultaneously triggers the timer to count and read the speed of the ith engine; S4. When the i-th engine speed is greater than the preset speed threshold, the main controller controls the i-th starter relay to be disconnected, and the timer is reset and triggered again; S5. When the timer timing time is greater than the preset waiting time, set i=i+1 and execute step S3; i is an integer greater than or equal to 1 and less than or equal to s.

2. The method according to claim 1, characterized in that Prior to S4, it also included: Determine whether the i-th engine speed is greater than a preset speed threshold; If the i-th engine speed is greater than the preset speed threshold, execute step S4; If the i-th engine speed is less than or equal to the preset speed threshold, determine whether the timer timing is greater than the preset start time; If the timer timing time is greater than the preset starting time, the main controller controls the i-th starting relay to be disconnected, the i-th engine is started successfully, the timer is reset and the timing step is triggered again; If the timer timing time is less than or equal to the preset starting time, the process returns to the step of determining whether the i-th engine speed is greater than the preset speed threshold.

3. The method according to claim 1, characterized in that The determining of the engine starting mode according to the lithium battery SOC value and the preset SOC threshold value includes: Determining whether the SOC value of the lithium battery is greater than a first preset SOC threshold; When the SOC value of the lithium battery is greater than a first preset SOC threshold, determining that the engine starting mode is an alternator starting mode; When the SOC value of the lithium battery is less than or equal to a first preset SOC threshold, it is determined that the starting mode of the engine is a starter motor sequential starting mode.

4. The method according to claim 3, characterized in that After determining that the engine starting mode is the alternator starting mode, the method further includes: In the alternator starting mode, determining whether the SOC value of the lithium battery is greater than a second preset SOC threshold; If yes, the main controller sends an "engine synchronous start command" to the electric control cabinet. After receiving the "engine synchronous start command", the electric control cabinet controls the p AC generators to rotate simultaneously and drive the s engines to rotate; If not, it is determined whether the SOC value of the lithium battery is greater than a third preset SOC threshold and less than or equal to a second preset SOC threshold.

5. The method according to claim 4, characterized in that After determining whether the SOC value of the lithium battery is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold, the method further includes: If so, the main controller sends an "engine synchronization + hybrid start command" to the electronic control cabinet. After receiving the "engine synchronization + hybrid start command", the electronic control cabinet controls c of the p AC generators to rotate simultaneously to drive the corresponding engines to rotate, and controls pc and c AC generators to start sequentially to drive the corresponding engines to rotate, where c is an integer greater than or equal to 2 and less than p. If not, it is determined whether the SOC value of the lithium battery is greater than a first preset SOC threshold and less than or equal to a third preset SOC threshold.

6. The method according to claim 5, characterized in that After determining whether the SOC value of the lithium battery is greater than the first preset SOC threshold and less than or equal to the third preset SOC threshold, the method further includes: If so, the main controller sends an "engine sequential start instruction" to the electric control cabinet. After receiving the "engine sequential start instruction", the electric control cabinet controls the p AC generators to start sequentially to drive the corresponding engines to rotate.

7. The method according to claim 1, characterized in that The second preset SOC threshold>the third preset SOC threshold>the first preset SOC threshold.

8. The method according to claim 1, characterized in that The system further includes a display; and the method further includes: When an engine fails to start, enter the start control page through the display to start a single engine independently.

9. A multi-engine hybrid mining car starting control system, characterized in that: The invention comprises a main controller, a starting switch, n starting relays, m starting motors, a battery, s engines, p alternating current generators, an electric control cabinet and a lithium battery, wherein n, m, s and p are integers greater than or equal to 3, and n=m=s=p; The main controller is respectively connected to the electric control cabinet, the lithium battery, n starting relays and the starting switch; The n starting relays are respectively connected to the corresponding m starting motors, and the m starting motors are respectively connected to the corresponding s engines; The batteries are connected to the m starting motors via n starting relays respectively; The electric control cabinet is connected to the corresponding s engines through the p AC generators respectively; The main controller is used to detect the start switch state and obtain the lithium battery SOC value; The main controller is further configured to determine the engine starting mode according to the lithium battery SOC value and a preset SOC threshold value when the start switch is in a closed state; The main controller is further configured to, when the engine starting mode is a starter motor sequential starting mode, control the ith starter relay to close, thereby connecting the battery and the starter motor corresponding to the ith starter relay, so that the ith starter motor drives the engine corresponding to the ith starter motor to rotate, and simultaneously trigger a timer to start timing and read the speed of the ith engine; The main controller is further configured to control the i-th starter relay to disconnect when the i-th engine speed is greater than a preset speed threshold, and simultaneously reset the timer and trigger timing again; The main controller is further configured to set i=i+1 and execute step S3 when the timer timing time is greater than the preset waiting time; i is an integer greater than or equal to 1 and less than or equal to s.

10. The system according to claim 9, characterized in that The system further includes a display connected to the main controller; The display is used to enter the start control page through the display to start a single engine independently when an engine fails to start.

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