Control method, system and equipment of electric golf cart and storage medium

Abstract

The invention discloses a control method, system and equipment of an electric golf cart and a storage medium, belongs to the technical field of control of electric golf carts, and solves the technical problem of full charge protection power failure during downhill when a battery is high in SOC (State of Charge) at present. The method comprises the following steps: detecting a current direction and a charging handshake message through a BMS (Battery Management System); when the current is positive and a charging handshake message exists, it is judged that the electric golf cart enters a charging stage, and a first switch is controlled to be closed for charging; when the current is positive and no charging handshake message exists, it is judged that the electric golf cart enters a braking energy feedback stage; the conditions of the battery SOC, the battery monomer voltage U and the battery temperature T are collected in real time through the BMS; according to the conditions of the battery SOC, the battery monomer voltage U and the battery temperature T, redundant feedback energy generated by braking is selected to be released or stored. Feedback electric quantity is absorbed through the energy releasing device, normal work of the electromagnetic brake is guaranteed, sudden braking is avoided, and personnel safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric golf cart control, and more specifically, to a control method, system, device and storage medium of an electric golf cart. Background Art

[0002] At present, electric golf carts usually use electromagnetic brake mode. The advantage is that when the ignition is released, the motor feeds back power to the battery and slows down, which can save some power. The disadvantage is that when the battery current is high or the reverse charging protection is disconnected, it will suddenly brake, causing personnel safety problems.

[0003] The existing technology uses a relay protection solution to solve the problem that MOS tubes are prone to large current or reverse charging protection, but it cannot solve the problem of full charge protection power failure when the battery is at a high SOC and then goes downhill, because the excess electricity generated when going downhill cannot be absorbed by the battery pack when it is fully charged. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One object of the present invention is to provide a control method for an electric golf cart that can improve safety.

[0005] A second object of the present invention is to provide a control system for an electric golf cart.

[0006] A third object of the present invention is to provide a computer device.

[0007] A fourth objective of the present invention is to provide a computer storage medium.

[0008] In order to achieve the above-mentioned first objective, the present invention provides a control method for an electric golf cart, comprising the following steps:

[0009] Step 1. Detect the current direction and charging handshake message through the BMS management system;

[0010] Step 2. When the current is positive and there is a charging handshake message, it is determined that the electric golf cart enters the charging stage, and the first switch is controlled to be attracted so that the electric golf cart is charged normally; when the current is positive and there is no charging handshake message, it is determined that the electric golf cart enters the braking energy feedback stage;

[0011] Step 3. After the electric golf cart enters the energy feedback stage, the battery SOC, battery cell voltage U, and battery temperature T are collected in real time through the BMS management system;

[0012] Step 4: Select whether to release or store the excess feedback energy generated by braking according to the battery SOC, battery cell voltage U, and battery temperature T:

[0013] When 0%<SOC<50%, 2.8V<U<3.3V, 5℃<T<45℃, the first switch is controlled to be closed, and the excess feedback energy is selected for storage;

[0014] When 0%<SOC<50%, 2.8V<U<3.3V, T>45℃, the second switch is controlled to be closed to connect the energy release device, the first switch is controlled to be disconnected, and the excess feedback energy is selected to be released;

[0015] When 0%<SOC<50%, 2.8V<U<3.3V, T<5℃, the second switch is controlled to be closed to connect the energy release device, and the first switch is controlled to be disconnected to select the excess feedback energy for release;

[0016] When SOC>50%, U>3.3V, T>45°C, the second switch is controlled to be closed to connect the energy release device, and the first switch is controlled to be disconnected to select the excess feedback energy for release.

[0017] As a further improvement, the BMS management system detects the current direction and the charging handshake message on the CAN bus once at a set interval.

[0018] Furthermore, it is characterized in that the set interval time is 0.5-1.5S.

[0019] Furthermore, the set interval time is 1S.

[0020] Further, when the detected current direction is negative and there is no charging handshake message, it is determined that the electric golf cart is traveling on a flat road without braking, the first switch remains normally closed, and the second switch remains open.

[0021] Further, when the detected current direction is positive and there is no charging handshake message, it is determined that the electric golf cart is traveling on a downhill section and there is braking behavior.

[0022] Furthermore, the first switch and the second switch are both relays, the energy release device includes a shell, a power resistor and a cooling fan are arranged in the shell, the second switch is located in the shell, the second switch is connected in series with the power resistor to form an energy release branch, the cooling fan is connected in series or in parallel with the power resistor, and the energy release branch is connected in parallel with the first switch and then in series with the charging circuit of the electric golf cart.

[0023] In order to achieve the above-mentioned second objective, the present invention provides a control system for an electric golf cart, comprising:

[0024] The first detection module is used to detect the current direction and charging handshake message through the BMS management system;

[0025] A determination module, for determining that the electric golf cart enters a charging stage when the current is positive and there is a charging handshake message, and controlling the first switch to be pulled in so that the electric golf cart is charged normally; and for determining that the electric golf cart enters a braking energy feedback stage when the current is positive and there is no charging handshake message;

[0026] The second detection module is used to collect the battery SOC, battery cell voltage U, and battery temperature T in real time through the BMS management system after the electric golf cart enters the energy feedback stage;

[0027] A selection control module is used to select whether to release or store the excess feedback energy generated by braking according to the battery SOC, battery cell voltage U, and battery temperature T:

[0028] When 0%<SOC<50%, 2.8V<U<3.3V, 5℃<T<45℃, the first switch is controlled to be closed, and the excess feedback energy is selected for storage;

[0029] When 0%<SOC<50%, 2.8V<U<3.3V, T>45℃, the second switch is controlled to be closed to connect the energy release device, the first switch is controlled to be disconnected, and the excess feedback energy is selected to be released;

[0030] When 0%<SOC<50%, 2.8V<U<3.3V, T<5℃, the second switch is controlled to be closed to connect the energy release device, and the first switch is controlled to be disconnected to select the excess feedback energy for release;

[0031] When SOC>50%, U>3.3V, T>45°C, the second switch is controlled to be closed to connect the energy release device, and the first switch is controlled to be disconnected to select the excess feedback energy for release.

[0032] In order to achieve the third objective, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the above-mentioned control method for an electric golf cart when executing the computer program.

[0033] In order to achieve the fourth objective above, the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the control method of an electric golf cart described above is implemented.

[0034] Beneficial Effects

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. The present invention absorbs the feedback electricity through the energy release device when going downhill, so as to ensure the normal operation of the electromagnetic brake, avoid sudden braking, ensure the safety of personnel, make up for the insufficient braking capacity when going downhill, and improve the braking efficiency and vehicle driving stability.

[0037] 2. In the case of battery feeding, the feedback electricity generated by braking can provide energy to the battery, extending the endurance of the lithium battery golf cart. In the case of braking, the battery pack can be evenly charged with a small current to prevent the battery pack from being overcharged, causing excessive battery loss and reducing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the circuit structure of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the energy release device in the present invention.

[0040] Among them: 1-housing, 2-power resistor, 3-cooling fan, 4-energy release branch, 5-charging circuit, 6-wire. DETAILED DESCRIPTION

[0041] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0042] See also Figure 1-2 , a control method for an electric golf cart, comprising the following steps:

[0043] Step 1. Detect the current direction and charging handshake message through the BMS management system;

[0044] Step 2. When the current is positive and there is a charging handshake message, it is determined that the electric golf cart enters the charging stage, and the first switch K1 is controlled to be closed, so that the electric golf cart is charged normally; when the current is positive and there is no charging handshake message, it is determined that the electric golf cart enters the braking energy feedback stage;

[0045] Step 3. After the electric golf cart enters the energy feedback stage, the battery SOC, battery cell voltage U, and battery temperature T are collected in real time through the BMS management system. The battery is a lithium battery;

[0046] Step 4. Choose to release or store the excess feedback energy generated by braking according to the battery SOC, battery cell voltage U, and battery temperature T:

[0047] When 0%<SOC<50%, 2.8V<U<3.3V, 5℃<T<45℃, the first switch K1 is controlled to be closed, and the excess feedback energy storage is selected, that is, the excess feedback energy is stored in the battery;

[0048] When 0%<SOC<50%, 2.8V<U<3.3V, T>45℃, the second switch K2 is controlled to be closed to connect the energy release device, and the first switch K1 is controlled to be disconnected, and the excess feedback energy is selected to be released, that is, the excess feedback energy is released through the energy release device;

[0049] When 0%<SOC<50%, 2.8V<U<3.3V, T<5℃, the second switch K2 is controlled to be closed to connect the energy release device, and the first switch K1 is controlled to be disconnected to select the excess feedback energy for release;

[0050] When SOC>50%, U>3.3V, T>45°C, the second switch K2 is controlled to be closed to connect the energy release device, and the first switch K1 is controlled to be disconnected to select the release of excess feedback energy.

[0051] When the electric golf cart is driving, the BMS management system detects the current direction and the charging handshake message on the CAN bus at a set interval, and the set interval is 0.5-1.5S. Preferably, the interval is set to 1S to ensure the sensitivity of the control.

[0052] When the detected current direction is negative and there is no charging handshake message, it is determined that the electric golf cart is traveling on a flat road without braking, the first switch K1 remains normally closed, and the second switch K2 remains open.

[0053] When the detected current direction is positive and there is no charging handshake message, it is determined that the electric golf cart is traveling on a downhill section and has braking behavior.

[0054] The first switch K1 and the second switch K2 are both relays, which can be mechanical contact relays or solid-state relays. The energy release device includes a housing 1, in which a power resistor 2 and a cooling fan 3 are arranged. The second switch K2 is located in the housing 1, and the second switch K2 is connected in series with the power resistor 2 to form an energy release branch 4. The cooling fan 3 is connected in series or in parallel with the power resistor 2, and the energy release branch 4 is connected in parallel with the first switch K1 and then in series with the charging circuit 5 of the electric golf cart. The power of the power resistor 2 can be selected according to the actual working conditions and the series / parallel form to ensure that the excess feedback energy can be effectively released. The energy release device is installed on the electric golf cart, preferably in a well-ventilated position. In order to improve the heat dissipation effect of the housing 1, fins can be arranged on the outer wall of the housing 1. In addition, the sealing performance of the housing 1 is good, and the wire 6 connecting the second switch K2 and the power resistor 2 is sealed with the housing 1 by a sealant.

[0055] A control system for an electric golf cart, comprising:

[0056] The first detection module is used to detect the current direction and charging handshake message through the BMS management system;

[0057] A determination module, for determining that the electric golf cart enters a charging stage when the current is positive and there is a charging handshake message, and controlling the first switch K1 to be attracted so that the electric golf cart is charged normally; and for determining that the electric golf cart enters a braking energy feedback stage when the current is positive and there is no charging handshake message;

[0058] The second detection module is used to collect the battery SOC, battery cell voltage U, and battery temperature T in real time through the BMS management system after the electric golf cart enters the energy feedback stage;

[0059] The control module is selected to release or store the excess feedback energy generated by braking according to the battery SOC, battery cell voltage U, and battery temperature T:

[0060] When 0%<SOC<50%, 2.8V<U<3.3V, 5℃<T<45℃, the first switch K1 is controlled to be closed, and the excess feedback energy is selected for storage;

[0061] When 0%<SOC<50%, 2.8V<U<3.3V, T>45℃, the second switch K2 is controlled to be closed to connect the energy release device, and the first switch K1 is controlled to be disconnected to select the excess feedback energy for release;

[0062] When 0%<SOC<50%, 2.8V<U<3.3V, T<5℃, the second switch K2 is controlled to be closed to connect the energy release device, and the first switch K1 is controlled to be disconnected to select the excess feedback energy for release;

[0063] When SOC>50%, U>3.3V, T>45°C, the second switch K2 is controlled to be closed to connect the energy release device, and the first switch K1 is controlled to be disconnected to select the release of excess feedback energy.

[0064] A computer device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the control method of the electric golf cart is realized.

[0065] A computer-readable storage medium stores a computer program, which implements the above-mentioned control method for an electric golf cart when executed by a processor.

[0066] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A control method for an electric golf cart, characterized in that: The following steps are involved: Step 1. Detect the current direction and charging handshake message through the BMS management system; Step 2. When the current is positive and there is a charging handshake message, it is determined that the electric golf cart enters the charging stage, and the first switch (K1) is controlled to be closed, so that the electric golf cart is charged normally; When the current is positive and there is no charging handshake message, it is determined that the electric golf cart enters the braking energy feedback stage; Step 3. After the electric golf cart enters the energy feedback stage, the battery SOC, battery cell voltage U, and battery temperature T are collected in real time through the BMS management system; Step 4: Select whether to release or store the excess feedback energy generated by braking according to the battery SOC, battery cell voltage U, and battery temperature T: When 0%<SOC<50%, 2.8V<U<3.3V, 5℃<T<45℃, the first switch (K1) is controlled to be closed, and the excess feedback energy is selected for storage; When 0%<SOC<50%, 2.8V<U<3.3V, T>45℃, the second switch (K2) is controlled to be closed to connect the energy release device, and the first switch (K1) is controlled to be disconnected to select the release of excess feedback energy; When 0%<SOC<50%, 2.8V<U<3.3V, T<5°C, the second switch (K2) is controlled to be closed to connect the energy release device, and the first switch (K1) is controlled to be disconnected to select the release of excess feedback energy; When SOC>50%, U>3.3V, T>45°C, the second switch (K2) is controlled to be closed to connect the energy release device, and the first switch (K1) is controlled to be disconnected to select the release of excess feedback energy.

2. The control method of an electric golf cart according to claim 1, characterized in that: The BMS management system detects the current direction and the charging handshake message on the CAN bus at a set interval.

3. The control method of an electric golf cart according to claim 2, characterized in that: The set interval time is 0.5-1.5S.

4. The control method of an electric golf cart according to claim 3, characterized in that: The set interval time is 1S.

5. The control method of an electric golf cart according to claim 1, characterized in that: When the detected current direction is negative and there is no charging handshake message, it is determined that the electric golf cart is traveling on a flat road section without braking, the first switch (K1) remains normally attracted, and the second switch (K2) remains disconnected.

6. The control method of an electric golf cart according to claim 1, characterized in that: When the detected current direction is positive and there is no charging handshake message, it is determined that the electric golf cart is traveling on a downhill section and has a braking behavior.

7. A control method for an electric golf cart according to any one of claims 1 to 6, characterized in that: The first switch (K1) and the second switch (K2) are both relays. The energy release device comprises a housing (1). A power resistor (2) and a cooling fan (3) are arranged in the housing (1). The second switch (K2) is located in the housing (1). The second switch (K2) is connected in series with the power resistor (2) to form an energy release branch (4). The cooling fan (3) and the power resistor (2) are connected in series or in parallel. The energy release branch (4) is connected in parallel with the first switch (K1) and then connected in series with a charging circuit (5) of the electric golf cart.

8. A control system for an electric golf cart, characterized in that: include: The first detection module is used to detect the current direction and charging handshake message through the BMS management system; A determination module, used for determining that the electric golf cart enters a charging stage when the current is positive and there is a charging handshake message, and controlling the first switch (K1) to be attracted so that the electric golf cart is charged normally; When the current is positive and there is no charging handshake message, it is determined that the electric golf cart enters the braking energy feedback stage; The second detection module is used to collect the battery SOC, battery cell voltage U, and battery temperature T in real time through the BMS management system after the electric golf cart enters the energy feedback stage; A selection control module is used to select whether to release or store the excess feedback energy generated by braking according to the battery SOC, battery cell voltage U, and battery temperature T: When 0%<SOC<50%, 2.8V<U<3.3V, 5℃<T<45℃, the first switch (K1) is controlled to be closed, and the excess feedback energy is selected for storage; When 0%<SOC<50%, 2.8V<U<3.3V, T>45℃, the second switch (K2) is controlled to be closed to connect the energy release device, and the first switch (K1) is controlled to be disconnected to select the release of excess feedback energy; When 0%<SOC<50%, 2.8V<U<3.3V, T<5°C, the second switch (K2) is controlled to be closed to connect the energy release device, and the first switch (K1) is controlled to be disconnected to select the release of excess feedback energy; When SOC>50%, U>3.3V, T>45°C, the second switch (K2) is controlled to be closed to connect the energy release device, and the first switch (K1) is controlled to be disconnected to select the release of excess feedback energy.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the control method of the electric golf cart according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of an electric golf cart according to any one of claims 1 to 7 is implemented.

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