Double-motor engine starting and storage battery charging composite system

Abstract

The utility model discloses a double-motor engine starting and storage battery charging composite system which comprises a unit control loop, a charger control loop and an engine starting loop, the charger control loop comprises a charging module and a storage battery pack charging loop, and the storage battery pack charging loop is a parallel loop formed by connecting a plurality of branches in parallel. Each branch comprises a storage battery pack and a diode, the charging module is used for charging the storage battery pack, and the diode is used for ensuring the normal charging process of the storage battery pack and electrically isolating the negative electrode of each storage battery pack; the engine starting loop comprises a first starting motor, a second starting motor and a generator, and the generator charges the storage battery pack and supplies power to the motors in the running process of the motors; the unit control loop comprises a unit controller and a storage battery pack control loop, the unit controller is used for controlling the running state of the motor, and the storage battery pack control loop comprises a storage battery pack control contactor and a direct-current circuit breaker and is used for controlling the storage battery pack to be connected into the circuit and timely isolating the storage battery pack when the storage battery pack breaks down. According to the utility model, the service life of the storage battery pack can be effectively prolonged, rapid electrical isolation between the storage battery pack and the motor is realized, and the working reliability, stability and maintainability of a starting loop are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical control, and more specifically, to a dual-motor engine starting and battery charging composite system. Background Art

[0002] like Figure 1 and 2 As shown, the existing high-power engine adopts a dual-starter motor strategy and is equipped with 4 batteries. Two batteries are connected in series to form a battery pack. The two battery packs are connected in parallel to supply power to the engine's electric starter motor. The voltage level is DC24V. The charger control circuit adopts an AC220V to DC24V charger. The positive and negative poles of the charger DC24V output terminals are connected in parallel with the battery pack respectively. When the charger AC220V input is normal, the battery pack can be charged. When the engine receives the start command and operates normally, the engine's own charging generator G and the charger charge the battery pack together.

[0003] According to the existing engine and battery control circuit and operation strategy, when the battery packs run continuously, the difference in internal resistance between different battery packs gradually increases. If the charger fails to charge at this time, an independent power supply circuit is formed between the battery packs, that is, the positive poles of the battery packs are connected in series, causing the battery packs to discharge each other, shortening the working life of the battery packs.

[0004] Furthermore, the electric starter motor of the conventional engine is directly connected to the battery pack. When a serious failure occurs in the battery pack, it is impossible to quickly achieve electrical isolation between the battery pack and the electric starter motor. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention innovatively provides a dual-motor engine starting and battery charging composite system, which adopts a multi-battery pack strategy, in which multiple battery packs are connected in parallel to jointly power the starter motor. Each branch where the battery pack is located is provided with a unidirectional diode to ensure the charging function of the battery pack. At the same time, when the charging module fails and the battery pack cannot be charged, electrical isolation is formed at the negative electrode of the battery pack to prevent mutual discharge between the battery packs, which can effectively extend the working life of the battery pack; direct connection between the battery pack and the starter motor is avoided, and a faulty battery pack can be quickly isolated, thereby improving the reliability, stability and maintainability of the starting circuit.

[0006] In order to achieve the above technical objectives, the utility model discloses a dual-motor engine starting and battery charging composite system, including a unit control circuit, a charger control circuit and an engine starting circuit.

[0007] The charger control circuit includes a charging module and a battery pack charging circuit. The battery pack charging circuit is a parallel circuit formed by connecting multiple branches in parallel. Each branch of the battery pack charging circuit includes a battery pack and a diode. The battery pack includes at least two batteries connected in series. The positive electrode of the battery pack is electrically connected to the positive electrode of the charging module, the negative electrode of the battery pack is electrically connected to the positive electrode of the diode, and the negative electrode of the diode is electrically connected to the negative electrode of the charging module.

[0008] The engine starting circuit includes a first starter motor M1, a second starter motor M2 and a generator G, wherein the positive terminal and the control terminal of the first starter motor M1 are electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G, the negative terminal of the first starter motor M1 is electrically connected to the charger control circuit, the positive terminal and the control terminal of the second starter motor M2 are electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G, the negative terminal of the second starter motor M2 is electrically connected to the charger control circuit, and the generator G is also electrically connected to the positive electrode of the battery pack;

[0009] The unit control circuit includes a unit controller and a battery pack control circuit, the unit controller is electrically connected to the battery pack control circuit, the battery pack control circuit includes the same number of battery pack control contactors as the battery packs and the same number of DC circuit breakers as the battery pack control contactors, the coils of the battery pack control contactors and the DC circuit breakers are connected in series one by one, the unit controller is used to control the start, standby and stop of the first starter motor M1 and the second starter motor M2 in the engine starting circuit; the normally open contacts of the battery pack control contactors are connected to the branches of the battery pack charging circuit one by one, and the normally open contacts of the battery pack control contactors are connected to the branches of the battery pack charging circuit one by one. It is connected in series with the corresponding battery pack and in parallel with the corresponding diode, one end of the normally open contact of the battery pack control contactor is connected to the battery pack, and the other end of the normally open contact of the battery pack control contactor is electrically connected to the engine starting circuit. The battery pack control contactor closes its normally open contact during the motor starting process so that the battery pack charging circuit and the engine starting circuit form a closed circuit to use the battery pack as the starting power supply for the motor; the DC circuit breaker is used to disconnect the electrical connection between the faulty battery pack and the first starter motor M1 and the second starter motor M2 when a battery pack fails during the operation of the first starter motor M1 and the second starter motor M2.

[0010] Furthermore, the battery pack control circuit also includes a DC power supply, a main circuit breaker 1QF, a reset switch 1SB, a first contactor 1KM and an intermediate relay 1KA, the main circuit breaker 1QF is connected to the positive and negative poles of the DC power supply, the reset switch 1SB is connected in series with the coil of the first contactor 1KM and then electrically connected to the positive and negative poles of the DC power supply through the main circuit breaker 1QF;

[0011] The ports of the unit controller include a negative power supply terminal, a positive power supply terminal, a fuel control terminal and a start control terminal. The negative power supply terminal of the unit controller is electrically connected to the negative pole of the DC power supply via the first normally open contact 1KM1 of the first contactor 1KM. The positive power supply terminal of the unit controller is electrically connected to the positive pole of the DC power supply via the third normally open contact 1KM3 of the first contactor 1KM and the second normally open contact 1KM2 of the first contactor 1KM in sequence. The battery pack control contactor and the DC circuit breaker are connected in series one by one to form a parallel circuit. One end of the parallel circuit is electrically connected to the positive power supply terminal. The other end of the parallel circuit is electrically connected to the negative end of the power supply, and the fuel control end and the start control end are both electrically connected to the positive end of the power supply inside the unit controller; the start control end is electrically connected to the engine start circuit at one end outside the unit controller, and is used to control the start, standby and stop of the first starter motor M1 and the second starter motor M2 in the engine start circuit; the fuel control end is electrically connected to one end of the intermediate relay 1KA at one end outside the unit controller, and is used to cut off the connection between the charging module and the battery pack when the battery pack supplies power to the motor.

[0012] Furthermore, the charging module includes an AC220V power supply, a miniature AC circuit breaker 6QF, a sixth contactor 6KM and a power conversion module. The AC220V power supply is electrically connected to the miniature AC circuit breaker 6QF. The coil of the sixth contactor 6KM is connected in series with the normally closed contact 1KA1 of the intermediate relay 1KA and then electrically connected to the AC220V power supply. The input end of the power conversion module is electrically connected to the AC220V power supply via the first normally open contact 6KM1 and the second normally open contact 6KM2 of the sixth contactor 6KM, and the output end of the power conversion module is electrically connected to the battery pack charging circuit.

[0013] Furthermore, the power conversion module is an AC220V to DC24V charger.

[0014] Furthermore, the engine starting circuit further includes a starting relay KA, a first starting contactor KM1 and a second starting contactor KM2, one end of the coil of the starting relay KA is electrically connected to the starting control end of the unit controller, and the other end of the coil of the starting relay KA is electrically connected to the negative electrode of the first starting motor M1 and the negative electrode of the second starting motor M2.

[0015] One end of the coil of the first starting contactor KM1 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the first normally open contact KA1 of the starting relay KA, the other end of the coil of the first starting contactor KM1 is electrically connected to the control terminal of the first starting motor M1, and the positive terminal of the first starting motor M1 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the normally open contact of the first starting contactor KM1.

[0016] One end of the coil of the second starting contactor KM2 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the second normally open contact KA2 of the starting relay KA, the other end of the coil of the second starting contactor KM2 is electrically connected to the control terminal of the second starter motor M2, and the positive terminal of the second starter motor M2 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the normally open contact of the second starting contactor KM2.

[0017] Furthermore, the battery pack charging circuit includes four parallel branches.

[0018] The beneficial effects of the utility model are as follows: a multi-battery group strategy is adopted, and multiple battery groups are connected in parallel to jointly supply power to the starter motor; a unidirectional diode is provided in the branch where each battery group is located to ensure the charging function of the battery group; at the same time, when the charging module fails and the battery group cannot be charged, electrical isolation is formed at the negative electrode of the battery group to prevent mutual discharge between the battery groups, which can effectively extend the working life of the battery group; direct connection between the battery group and the starter motor is avoided, and a faulty battery group can be quickly isolated, thereby improving the reliability, stability and maintainability of the starting circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The invention is an electrical control schematic diagram of an existing dual-motor engine starting and battery charging composite system.

[0020] Figure 2 This is the wiring diagram of the existing battery pack and electric starter motor.

[0021] Figure 3The utility model is a schematic diagram of the electrical control principle of the dual-motor engine starting and battery charging composite system of the embodiment.

[0022] Figure 4 It is the actual wiring diagram of the battery pack of the embodiment of the utility model.

[0023] Figure 5 It is another actual wiring diagram of the battery pack of the embodiment of the utility model.

[0024] Figure 6 The present invention is a flowchart of a dual-motor engine starting and battery charging composite system according to an embodiment of the present invention.

[0025] In the figure,

[0026] 1. Generator set control circuit; 11. Generator set controller; 12. Battery pack control circuit; 2. Charger control circuit; 21. Charging module; 22. Battery pack charging circuit; 3. Engine starting circuit. DETAILED DESCRIPTION

[0027] The dual-motor engine starting and battery charging composite system provided by the utility model is explained and illustrated in detail below in conjunction with the drawings in the specification.

[0028] This embodiment specifically discloses a dual-motor engine starting and battery charging composite system, such as Figure 3 As shown, it includes a unit control circuit 1, a charger control circuit 2 and an engine starting circuit 3. The charger control circuit 2 includes a charging module 21 and a battery pack charging circuit 22. The positive electrode of the charging module 21 is electrically connected to the positive electrode of the battery pack charging circuit 22. The battery pack charging circuit 22 is a parallel circuit formed by connecting multiple branches in parallel. Each branch of the battery pack charging circuit 22 includes a battery pack and a diode. The battery pack includes at least two batteries connected in series. The positive electrode of the battery pack is electrically connected to the positive electrode of the charging module, the negative electrode of the battery pack is electrically connected to the positive electrode of the diode, and the negative electrode of the diode is electrically connected to the negative electrode of the charging module. The charging module, the battery pack and the diode constitute a charging circuit for charging the battery pack in the motor standby state. The diode is used to ensure the normal charging process of the battery pack. At the same time, when the charging module fails and cannot charge the battery pack, electrical isolation is formed at the negative electrode of the battery pack to prevent mutual discharge between the battery packs, which can effectively extend the working life of the battery pack.

[0029] The engine starting circuit 3 includes a first starter motor M1, a second starter motor M2 and a generator G. The positive terminal and the control terminal of the first starter motor M1 are electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G. The negative terminal of the first starter motor M1 is electrically connected to the charger control circuit 2. The positive terminal and the control terminal of the second starter motor M2 are electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G. The negative terminal of the second starter motor M2 is electrically connected to the charger control circuit 2, and the generator G is also electrically connected to the positive electrode of the battery pack.

[0030] The unit control circuit 1 includes a unit controller 11 and a battery pack control circuit 12. The unit controller 11 is electrically connected to the battery pack control circuit 12. The battery pack control circuit 12 includes the same number of battery pack control contactors as the battery packs and the same number of DC circuit breakers as the battery pack control contactors. The coils of the battery pack control contactors and the DC circuit breakers are connected in series one by one. The unit controller 11 is used to control the start, standby and stop of the first starter motor M1 and the second starter motor M2 in the engine start circuit 3; the normally open contacts of the battery pack controller contactors are connected to the branches of the battery pack charging circuit one by one. The battery pack control contactors are connected to the branches of the battery pack charging circuit one by one. The normally open contact of the battery pack control contactor is connected in series with the corresponding battery pack and in parallel with the corresponding diode. One end of the normally open contact of the battery pack control contactor is connected to the battery pack, and the other end of the normally open contact of the battery pack control contactor is electrically connected to the engine starting circuit 3. The battery pack control contactor closes its normally open contact during the motor starting process so that the battery pack charging circuit 22 and the engine starting circuit 3 form a closed circuit to use the battery pack as the starting power supply for the motor; the DC circuit breaker is used to disconnect the electrical connection between the faulty battery pack and the first starter motor M1 and the second starter motor M2 when a battery pack fails during the operation of the first starter motor M1 and the second starter motor M2.

[0031] The battery pack control circuit 12 also includes a DC power supply, a main circuit breaker 1QF, a reset switch 1SB, a first contactor 1KM, and an intermediate relay 1KA. The main circuit breaker 1QF is connected to the positive and negative poles of the DC power supply. The reset switch 1SB is connected in series with the coil of the first contactor 1KM and then electrically connected to the positive and negative poles of the DC power supply through the main circuit breaker 1QF. The port of the unit controller 11 includes a negative power supply terminal, a positive power supply terminal, a fuel control terminal, and a start control terminal. The negative power supply terminal of the unit controller 11 is electrically connected to the negative pole of the DC power supply through the first normally open contact 1KM1 of the first contactor 1KM, and the positive power supply terminal of the unit controller 11 is sequentially connected through the third normally open contact 1KM3 of the first contactor 1KM, the second normally open contact 1KM of the first contactor 1KM, and the start control terminal. KM2 is electrically connected to the positive pole of the DC power supply, and the battery pack control contactor and the DC circuit breaker are connected in series one by one to form a parallel circuit, one end of the parallel circuit is electrically connected to the positive terminal of the power supply, and the other end of the parallel circuit is electrically connected to the negative terminal of the power supply, and the fuel control end and the start control end are both electrically connected to the positive terminal of the power supply inside the unit controller 11; one end of the start control end outside the unit controller 11 is electrically connected to the engine start circuit 3, and is used to control the start, standby and shutdown of the first starter motor M1 and the second starter motor M2 in the engine start circuit 3; one end of the fuel control end outside the unit controller 11 is electrically connected to one end of the intermediate relay 1KA, and is used to cut off the connection between the charging module 21 and the battery pack when the battery pack supplies power to the motor.

[0032] The charging module 21 includes an AC220V power supply, a micro AC circuit breaker 6QF, a sixth contactor 6KM and a power conversion module. The AC220V power supply is electrically connected to the micro AC circuit breaker 6QF. The coil of the sixth contactor 6KM is connected in series with the normally closed contact 1KA1 of the intermediate relay 1KA and then electrically connected to the AC220V power supply. The input end of the power conversion module is electrically connected to the AC220V power supply via the first normally open contact 6KM1 and the second normally open contact 6KM2 of the sixth contactor 6KM, and the output end of the power conversion module is electrically connected to the battery pack charging circuit 22.

[0033] In this embodiment, the power conversion module is an AC220V to DC24V charger, which is used to convert 220V AC voltage into 24V DC voltage.

[0034] The sixth contactor 6KM is used to control the working condition of the charging module 21. When the coil of the sixth contactor 6KM is energized, the first normally open contact 6KM1 and the second normally open contact 6KM2 of the sixth contactor 6KM are in a closed state, the charging module 21 and the battery pack charging circuit 22 are electrically connected, and the charging module 21 charges the battery pack.

[0035] like Figure 3-5As shown, in this embodiment, the battery pack charging circuit 22 includes 4 parallel branches, the number of battery packs is 4, and the battery packs are respectively the first battery pack 1-2GB, the second battery pack 3-4GB, the third battery pack 5-6GB and the fourth battery pack 7-8GB, and the state of the battery pack connected to the charger control circuit 2 is controlled by the normally open contact of the battery pack control contactor. Correspondingly, the number of battery pack control contactors and DC circuit breakers are both 4, and the battery pack control contactors are respectively the second battery pack control contactor 2KM, the third battery pack control contactor 3KM, the fourth battery pack control contactor 4KM and the fifth battery pack control contactor 5KM, and the second DC circuit breaker 2QF, the third DC circuit breaker 3QF, the fourth DC circuit breaker 4QF and the fifth DC circuit breaker 5QF correspond to each other. The second DC circuit breaker 2QF, the third DC circuit breaker 3QF, the fourth DC circuit breaker 4QF, and the fifth DC circuit breaker 5QF are used to control the coil power-on status of the second battery pack control contactor 2KM, the third battery pack control contactor 3KM, the fourth battery pack control contactor 4KM, and the fifth battery pack control contactor 5KM, respectively. During the normal operation of the engine, if a battery pack fails, the corresponding DC circuit breaker will be disconnected, and the coil of the battery pack control contactor connected in series with the DC circuit breaker will be de-energized, and the normally open contact of the corresponding battery pack control contactor will be disconnected, cutting off the connection between the battery pack and the generator starting circuit, thereby realizing rapid electrical isolation of the faulty battery pack.

[0036] In this embodiment, four diodes are also provided, namely, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, which are respectively used to ensure the normal charging of the first battery group 1-2GB, the second battery group 3-4GB, the third battery group 5-6GB and the fourth battery group 7-8GB. After the reset switch 1SB is reset, the battery group control contactor 1-5KM automatically opens. At this time, the positive poles of the first battery group 1-2GB, the second battery group 3-4GB, the third battery group 5-6GB and the fourth battery group 7-8GB are connected in parallel and the negative poles are isolated. However, the battery group can form a charging circuit through the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, so that the charging module can charge the four battery groups and maintain the working state of the battery group.

[0037] During the charging process of the battery pack, if the charging module fails at this time, the first battery pack 1-2GB, the second battery pack 3-4GB, the third battery pack 5-6GB and the fourth battery pack 7-8GB form a parallel circuit without any load at this time, and the battery packs discharge each other, which seriously affects the working life of the battery. Through the setting of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, the negative pole of each battery pack is electrically isolated. Even if the charging module cannot work due to a fault, the battery packs are independent of each other and no discharge circuit is formed, thereby extending the working life of the battery.

[0038] like Figure 3-5 As shown, each battery pack includes two independent batteries, and the two independent batteries in each battery pack are connected in series. Battery 1GB and battery 2GB are connected in series to form a first battery pack 1-2GB, battery 2GB and battery 4GB are connected in series to form a second battery pack 3-4GB, battery 5GB and battery 6GB are connected in series to form a third battery pack 5-6GB, and battery 7GB and battery 8GB are connected in series to form a fourth battery pack 7-8GB. Each battery pack forms a separate branch, and the positive sides of multiple branches (i.e., one end close to the positive side of the battery pack) are electrically connected together to form a parallel circuit, and the negative sides of multiple branches (i.e., one end close to the negative side of the battery pack) are electrically connected to the negative pole of the first starter motor M1 and the negative pole of the second starter motor M2 respectively, and the positive poles of the first starter motor M1 and the second starter motor M2 are both electrically connected to the positive side of the parallel circuit.

[0039] like Figure 5 As shown, each battery pack is connected in series with a normally open contact of a battery pack control contactor, which facilitates rapid isolation of the battery pack when a fault occurs and cuts off the electrical connection between the battery pack and the starter motor.

[0040] The engine starting circuit 3 also includes a starting relay KA, a first starting contactor KM1 and a second starting contactor KM2. One end of the coil of the starting relay KA is electrically connected to the starting control end of the unit controller, and the other end of the coil of the starting relay KA is electrically connected to the negative electrode of the first starting motor M1 and the negative electrode of the second starting motor M2. One end of the coil of the first starting contactor KM1 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G through the first normally open contact KA1 of the starting relay KA. The other end of the coil of the first starting contactor KM1 is electrically connected to the control terminal of the first starting motor M1. The positive terminal of the motor M1 is electrically connected to the positive pole of the battery pack, the positive pole of the charging module and the positive pole of the generator G via the normally open contact of the first starting contactor KM1; one end of the coil of the second starting contactor KM2 is electrically connected to the positive pole of the battery pack, the positive pole of the charging module and the positive pole of the generator G via the second normally open contact KA2 of the starting relay KA, the other end of the coil of the second starting contactor KM2 is electrically connected to the control terminal of the second starting motor M2, and the positive terminal of the second starting motor M2 is electrically connected to the positive pole of the battery pack, the positive pole of the charging module and the positive pole of the generator G via the normally open contact of the second starting contactor KM2. The starting relay KA is used to control the on-off state of the first starting contactor KM1 and the second starting contactor KM2, the first starting contactor KM1 is used to control the operating state of the first starting motor M1, and the second starting contactor KM2 is used to control the operating state of the second starting motor M2. The generator G is used to charge the battery pack and supply power to the motors during the operation of the first starter motor M1 and the second starter motor M2, so as to maintain stable operation of the motors.

[0041] The starting process of the first starter motor M1 and the second starter motor M2 is as follows: after the starting control end of the unit controller 11 sends a starting signal, the coil of the starting relay KA is energized and the corresponding first normally open contact KA1 and second normally open contact KA2 of the starting relay KA are closed. At this time, the coil of the first starting contactor KM1 and the coil of the second starting contactor KM2 are energized, and then the normally open contact of the first starting contactor KM1 and the normally open contact of the second starting contactor KM2 are closed. At this time, the positive terminal and control terminal of the first starter motor M1 and the second starter motor M2 are energized, and the first starter motor M1 and the second starter motor M2 are started.

[0042] The normal operation workflow of this embodiment is as follows Figure 6 As shown,

[0043] (1) The main circuit breaker 1QF, the second DC circuit breaker 2QF, the third DC circuit breaker 3QF, the fourth DC circuit breaker 4QF, the fifth DC circuit breaker 5QF and the micro AC circuit breaker 6QF are all in the closed state. When the DC power supply and the AC power supply - AC220V power supply input are normal, the coil of the sixth contactor 6KM is energized, the first normally open contact 6KM1 and the second normally open contact 6KM2 of the sixth contactor 6KM are closed, and the charging module works normally and charges the battery pack. At this time, the engine is still in the standby state, and the intermediate relay 1KA is in the power-off state.

[0044] (2) Press the reset switch 1SB, the reset switch 1SB is closed, the coil of the first battery group control contactor 1KM is energized, and the first normally open contact 1KM1, the second normally open contact 1KM2 and the third normally open contact 1KM3 of the first battery group control contactor 1KM are closed. At this time, the coils of the second battery group control contactor 2KM, the third battery group control contactor 3KM, the fourth battery group control contactor 4KM and the fifth battery group control contactor 5KM are energized, the coils of the intermediate relay 1KA and the starter relay KA are energized, and the first normally open contact 2KM1 of the second battery group control contactor 2KM, the first normally open contact 3KM1 of the third battery group control contactor 3KM and the first normally open contact 4KM of the fourth battery group control contactor 4KM are energized. The normally open contact 4KM1 and the first normally open contact 5KM1 of the fifth battery pack control contactor 5KM are closed, and the battery pack is connected to the engine starting circuit. At the same time, the first normally closed contact 1KA1 of the intermediate relay 1KA is disconnected, and the coil of the sixth contactor 6KM is de-energized to disconnect its contacts 6KM1 and 6KM2. The charging module stops working and no longer charges the battery pack. The first normally open contact KA1 and the second normally open contact KA2 of the starting relay KA are closed. Further, the coils of the first starting contactor KM1 and the second starting contactor KM2 are energized, and the normally open contacts of the first starting contactor KM1 and the second starting contactor KM2 are closed. The first starting motor M1 and the second starting motor M2 are connected to the engine starting circuit and connected to the battery pack, and the engine starts.

[0045] (3) In order to maintain the stable working voltage of the battery pack, the generator G works to charge the battery pack. When the engine stops, the charging module starts to work to charge the battery pack.

[0046] In this embodiment, when any battery pack fails during engine operation, the working state is as follows:

[0047] When the first battery pack 1-2GB fails, the second DC circuit breaker 2QF is disconnected and the second battery pack control contactor 2KM is opened to electrically isolate the first battery pack 1-2GB from the engine starting circuit. At this time, the second battery pack 3-4GB, the third battery pack 5-6GB and the fourth battery pack 7-8GB can be used to drive the first starter motor M1 and the second starter motor M2 of the engine to work normally.

[0048] When the second battery pack 3-4GB fails, the third DC circuit breaker 3QF is disconnected and the third battery pack control contactor 3KM is opened to electrically isolate the second battery pack 3-4GB from the engine starting circuit. At this time, the first battery pack 1-2GB, the third battery pack 5-6GB and the fourth battery pack 7-8GB can be used to drive the first starter motor M1 and the second starter motor M2 of the engine to work normally.

[0049] When the third battery pack 5-6GB fails, the fourth DC circuit breaker 4QF is disconnected and the fourth battery pack control contactor 4KM is opened to electrically isolate the third battery pack 5-6GB from the engine starting circuit. At this time, the first battery pack 1-2GB, the second battery pack 3-4GB and the fourth battery pack 7-8GB can be used to drive the first starter motor M1 and the second starter motor M2 of the engine to work normally.

[0050] When the fourth battery pack 7-8GB fails, the fifth DC circuit breaker 5QF is disconnected and the fifth battery pack control contactor 5KM is opened to electrically isolate the fourth battery pack 7-8GB from the engine starting circuit. At this time, the first battery pack 1-2GB, the second battery pack 3-4GB and the third battery pack 5-6GB can be used to drive the first starter motor M1 and the second starter motor M2 of the engine to work normally.

[0051] In this embodiment, when the engine is in a long-term power-off state, the working state is as follows:

[0052] After resetting the reset switch 1SB, the contactor 1-5KM automatically opens. At this time, the positive poles of the first battery group 1-2GB, the second battery group 3-4GB, the third battery group 5-6GB and the fourth battery group 7-8GB are connected in parallel and the negative poles are isolated. However, the battery groups can form a charging circuit through the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, so that the charging module can charge the four battery groups and maintain the working state of the battery groups.

[0053] The utility model adopts a multi-battery group strategy, where multiple groups of batteries are connected in parallel to jointly power the starter motor; each branch where the battery group is located is provided with a unidirectional diode to ensure the charging function of the battery group, and at the same time, when the charging module fails and cannot charge the battery group, electrical isolation is formed at the negative electrode of the battery group to prevent mutual discharge between the battery groups, which can effectively extend the working life of the battery group; the charging module is directly connected to the mains and can charge the battery group at any time, reducing the manual charging process and improving the automation of the equipment. Compared with the method in the prior art where each battery group is directly connected to the starter motor, the present application can quickly isolate the faulty battery group, improving the reliability, stability and maintainability of the electric start circuit.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and simple improvement made to the essential content of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual-motor engine starting and battery charging composite system, characterized in that: It includes a unit control circuit (1), a charger control circuit (2) and an engine starting circuit (3). The charger control circuit (2) comprises a charging module (21) and a battery pack charging circuit (22); the battery pack charging circuit (22) is a parallel circuit formed by connecting a plurality of branches in parallel; each branch of the battery pack charging circuit (22) comprises a battery pack and a diode; the battery pack comprises at least two batteries connected in series; the positive electrode of the battery pack is electrically connected to the positive electrode of the charging module; the negative electrode of the battery pack is electrically connected to the positive electrode of the diode; and the negative electrode of the diode is electrically connected to the negative electrode of the charging module; The engine starting circuit (3) comprises a first starting motor M1, a second starting motor M2 and a generator G, wherein the positive terminal and the control terminal of the first starting motor M1 are electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G, the negative terminal of the first starting motor M1 is electrically connected to the charger control circuit (2), the positive terminal and the control terminal of the second starting motor M2 are electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G, the negative terminal of the second starting motor M2 is electrically connected to the charger control circuit (2), and the generator G is also electrically connected to the positive electrode of the battery pack; The unit control circuit (1) comprises a unit controller (11) and a battery pack control circuit (12). The unit controller (11) is electrically connected to the battery pack control circuit (12). The battery pack control circuit (12) comprises the same number of battery pack control contactors as the battery packs and the same number of DC circuit breakers as the battery pack control contactors. The coils of the battery pack control contactors and the DC circuit breakers are connected in series one by one. The unit controller (11) is used to control the start, standby and stop of the first starter motor M1 and the second starter motor M2 in the engine start circuit (3). The normally open contacts of the battery pack control contactors are connected one by one to the branches of the battery pack charging circuit (22). The normally open contact of the battery pack control contactor is connected in series with the corresponding battery pack and in parallel with the corresponding diode. One end of the normally open contact of the battery pack control contactor is connected to the battery pack, and the other end of the normally open contact of the battery pack control contactor is electrically connected to the engine starting circuit (3). The battery pack control contactor closes its normally open contact during the motor starting process so that the battery pack charging circuit (22) and the engine starting circuit (3) form a closed circuit and use the battery pack as the starting power supply for the motor; the DC circuit breaker is used to disconnect the electrical connection between the faulty battery pack and the first starting motor M1 and the second starting motor M2 when the battery pack fails during the operation of the first starting motor M1 and the second starting motor M2.

2. The dual-motor engine starting and battery charging combined system according to claim 1, characterized in that: The battery pack control circuit (12) further comprises a DC power supply, a main circuit breaker 1QF, a reset switch 1SB, a first contactor 1KM and an intermediate relay 1KA, wherein the main circuit breaker 1QF is connected to the positive and negative electrodes of the DC power supply, and the reset switch 1SB is connected in series with the coil of the first contactor 1KM and then electrically connected to the positive and negative electrodes of the DC power supply via the main circuit breaker 1QF; The ports of the unit controller (11) include a negative power supply terminal, a positive power supply terminal, a fuel control terminal and a start control terminal. The negative power supply terminal of the unit controller (11) is electrically connected to the negative pole of the DC power supply via the first normally open contact 1KM1 of the first contactor 1KM. The positive power supply terminal of the unit controller (11) is electrically connected to the positive pole of the DC power supply via the third normally open contact 1KM3 of the first contactor 1KM and the second normally open contact 1KM2 of the first contactor 1KM in sequence. The battery pack control contactor and the DC circuit breaker are connected in series one by one to form a parallel circuit. One end of the parallel circuit is electrically connected to the positive power supply terminal. The parallel circuit The other end of the connecting loop is electrically connected to the negative end of the power supply, and the fuel control end and the start control end are both electrically connected to the positive end of the power supply inside the unit controller (11); the start control end is electrically connected to the engine start circuit (3) at one end outside the unit controller (11) for controlling the start, standby and stop of the first starter motor M1 and the second starter motor M2 in the engine start circuit (3); the fuel control end is electrically connected to one end of the intermediate relay 1KA at one end outside the unit controller (11) for cutting off the connection between the charging module (21) and the battery pack when the battery pack supplies power to the motor.

3. The dual-motor engine starting and battery charging combined system according to claim 2, characterized in that: The charging module (21) comprises an AC220V power supply, a miniature AC circuit breaker 6QF, a sixth contactor 6KM and a power conversion module, wherein the AC220V power supply is electrically connected to the miniature AC circuit breaker 6QF, the coil of the sixth contactor 6KM is connected in series with the normally closed contact 1KA1 of the intermediate relay 1KA and then electrically connected to the AC220V power supply, the input end of the power conversion module is electrically connected to the AC220V power supply via the first normally open contact 6KM1 and the second normally open contact 6KM2 of the sixth contactor 6KM, and the output end of the power conversion module is electrically connected to the battery pack charging circuit (22).

4. The dual-motor engine starting and battery charging combined system according to claim 3, characterized in that: The power conversion module is an AC220V to DC24V charger.

5. The dual-motor engine starting and battery charging combined system according to any one of claims 1 to 3, characterized in that: The engine starting circuit (3) further comprises a starting relay KA, a first starting contactor KM1 and a second starting contactor KM2, one end of the coil of the starting relay KA is electrically connected to the starting control end of the unit controller, and the other end of the coil of the starting relay KA is electrically connected to the negative electrode of the first starting motor M1 and the negative electrode of the second starting motor M2. One end of the coil of the first starting contactor KM1 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the first normally open contact KA1 of the starting relay KA, the other end of the coil of the first starting contactor KM1 is electrically connected to the control terminal of the first starting motor M1, and the positive terminal of the first starting motor M1 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the normally open contact of the first starting contactor KM1. One end of the coil of the second starting contactor KM2 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the second normally open contact KA2 of the starting relay KA, the other end of the coil of the second starting contactor KM2 is electrically connected to the control terminal of the second starter motor M2, and the positive terminal of the second starter motor M2 is electrically connected to the positive electrode of the battery pack, the positive electrode of the charging module and the positive electrode of the generator G via the normally open contact of the second starting contactor KM2.

6. The dual-motor engine starting and battery charging combined system according to claim 1, characterized in that: The battery pack charging circuit (22) comprises four parallel branches.

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