Circuit and method for improving robustness of up-down high voltage of new energy automobile

Abstract

The invention discloses a circuit and a method for improving the robustness of upper and lower high voltage of a new energy automobile. The circuit comprises a high-voltage loop, components of the high-voltage loop comprise a pre-charging relay K1, a main positive relay K2, a main negative relay K3, a direct-current charging positive relay K4, a direct-current charging negative relay K5, a fuse FUSE, a battery pack positive end high-voltage sampling point BAT +, a fuse rear end high-voltage sampling point FUSE +, a main positive rear end high-voltage sampling point PREE +, a battery pack negative end high-voltage sampling point BAT-and a main negative loop detection point Rly-. The circuit comprises a main negative rear-end high-voltage sampling point PREE-, a pre-charging resistor, a main negative loop divider resistor, a Hall sensor HALL, an explosion switch PSS and a shunt SHUNT. The method can effectively prevent the vehicle from mistakenly reporting errors, so that the vehicle enters an over-protection state, and safety throwing responses such as abnormal lower high voltage or incapability of higher high voltage are caused, and unnecessary severe experience is brought to a driver.

Description

Technical Field

[0001] The present invention relates to the technical field of improving the robustness of upper and lower high voltages of new energy vehicles, and in particular to a method for improving the robustness of upper and lower high voltages of new energy vehicles. Background Art

[0002] With the rapid development of the new energy vehicle industry, the high and low voltage electromagnetic interference of new energy vehicles cannot be completely shielded. At the same time, the three circuits of high voltage circuit, insulation circuit and sampling circuit are prone to cross-current, which eventually causes abnormal sampling signal, thus leading to abnormal high voltage sampling, and then causing misdiagnosis of relay rationality.

[0003] In order to solve this problem, we designed a method to improve the robustness of upper and lower high voltage of new energy vehicles, thus solving this problem. Summary of the invention

[0004] In view of the above-mentioned technical problems in the prior art, the present invention provides a method for improving the robustness of high voltage upper and lowering of new energy vehicles, so as to prevent the vehicle from making false alarms, causing the vehicle to enter an over-protection state, and causing abnormal low voltage or inability to raise high voltage, etc., which brings unnecessary bad experience to the driver.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A circuit for improving the robustness of upper and lower high voltages of a new energy vehicle comprises a high-voltage circuit, wherein the components of the high-voltage circuit comprise a pre-charging relay K1, a main positive relay K2, a main negative relay K3, a DC positive charging relay K4, a DC negative charging relay K5, a fuse FUSE, a battery pack positive end high-voltage sampling point BAT+, a fuse rear end high-voltage sampling point FUSE+, a main positive rear end high-voltage sampling point PRE+, a battery pack negative end high-voltage sampling point BAT-, a main negative circuit detection point Rly-, a main negative rear end high-voltage sampling point PRE-, a pre-charging resistor, a main negative circuit voltage-dividing resistor, a Hall sensor HALL, a blast switch PSS and a shunt SHUNT;

[0007] The positive end of the battery pack is connected in series with one end of the fuse FUSE, the positive end high-voltage sampling point BAT+ of the battery pack is arranged at the front end of the fuse FUSE, the rear end of the fuse FUSE is connected in series with the front end of the main positive relay K2, the rear end high-voltage sampling point FUSE+ of the fuse is arranged at the rear end of the fuse FUSE, the rear end of the main positive relay K2 is connected in series with the front end of the Hall sensor HALL, the main positive rear end high-voltage sampling point PRE+ is arranged at the rear end of the main positive relay K2, the pre-charging resistor and the pre-charging relay K1 are arranged between the rear end of the fuse FUSE and the front end of the Hall sensor HALL, the pre-charging resistor is connected in series with the pre-charging relay K1, the pre-charging resistor and the pre-charging relay K1 are connected in parallel with the main positive relay K2, the rear end of the Hall sensor HALL is respectively connected in series with the positive end of the front drive, the positive end of the rear drive and the positive end of the direct current DC, and the direct current positive charging relay K4 is connected in series between the rear end of the Hall sensor HALL and the positive end of the direct current DC;

[0008] The negative terminal of the battery pack is connected in series with the front end of the detonation switch PSS, the negative terminal high-voltage sampling point BAT- of the battery pack is arranged at the front end of the detonation switch PSS, the rear end of the detonation switch PSS is connected in series with the front end of the shunt SHUNT, the rear end of the shunt SHUNT is connected in series with the front end of the main negative relay K3, the rear end of the main negative relay K3 is respectively connected in series with the negative end of the front drive, the negative end of the rear drive and the negative end of the direct current DC, the main negative circuit voltage-dividing resistor is connected in series with the main negative circuit detection point Rly-, the main negative circuit voltage-dividing resistor and the main negative circuit detection point Rly- are connected in parallel with the main negative relay K3, the main negative rear end high-voltage sampling point PRE- is arranged at the rear end of the main negative relay K3, and the DC charging negative relay K5 is connected in series between the rear end of the main negative relay K3 and the negative end of the direct current DC.

[0009] A method based on improving the robustness of high voltage up and down circuits of new energy vehicles. In the high voltage up process of the high voltage circuit, the relay drive level diagnosis, the high voltage sampling circuit diagnosis, and the relay rationality diagnosis are completely decoupled. The relay drive level fault and the high voltage sampling circuit fault do not inhibit the high voltage, but at the same time, the diagnosis of the relay rationality fault is not inhibited. In the whole high voltage up process, the following three faults are used to implement the protection; all other faults are finally responded to and processed by the following three faults (prohibiting the high voltage up): 1) The positive main relay or the pre-charging relay is stuck: prevent the high voltage from continuing to be applied, causing the main negative relay to be further stuck; 2) Pre-charging timeout: the pre-charging is unsuccessful and the high voltage cannot be applied; 3) Pre-charging overcurrent: prohibiting the high voltage up to prevent the risk of burning the high voltage circuit during the pre-charging period.

[0010] As a further elaboration of the above technical solution:

[0011] In the above technical solution, the upper and lower high voltage timing sequence of the high voltage circuit is closing the main negative → closing the pre-charge → closing the main positive → disconnecting the pre-charge → disconnecting the main positive → disconnecting the main negative.

[0012] In the above technical solution, the high-voltage circuit needs to complete the following points before making a high-voltage request: a. Complete the BMS initialization signal diagnosis, including the bottom-level sampling validity diagnosis of 6 voltage sampling points, the 6 voltage sampling points include the battery pack positive terminal sampling voltage BAT+, the fuse rear end sampling voltage FUSE+, the main positive rear end sampling voltage PRE+, the battery pack negative terminal sampling voltage BAT-, the main negative sampling voltage Rly- and the main negative rear end sampling voltage PRE-; b. Complete the high-voltage sampling circuit diagnosis, including the battery pack positive terminal sampling voltage, the fuse rear end sampling voltage BAT+, the fuse rear end sampling voltage FUSE+, and the main negative rear end sampling voltage PRE-; c. Complete the relay drive level diagnosis in the non-activated working condition; d. Complete the adhesion diagnosis of the main positive relay K2 and the main negative relay K3, and the adhesion diagnosis of the main positive relay K2 and the pre-charge relay K1;

[0013] In the above technical scheme, the following points need to be completed during the high-voltage process on the high-voltage circuit: a. Complete the diagnosis of the main negative relay K3 being stuck in disconnection, and complete the diagnosis of the pre-charge relay K1 being stuck in disconnection; b. Complete the diagnosis of the fuse FUSE open circuit; c. Complete the diagnosis of the main positive and rear end sampling voltage PRE+ sampling line and the battery pack negative end sampling voltage BAT- sampling line; d. Complete the relevant diagnosis of the pre-charge relay K1: high-voltage circuit pre-charge timeout or high-voltage circuit pre-charge overcurrent; e. Complete the relay drive level diagnosis during the activation condition.

[0014] In the above technical solution, when the high-voltage circuit is in a high-voltage state, it is necessary to complete the abnormal disconnection diagnosis of the main positive relay K2 or the main negative relay K3.

[0015] In the above technical solution, after the high-voltage circuit has a high-voltage request, the main positive relay K2 and the main negative relay K3 adhesion diagnosis and the high-voltage circuit discharge timeout diagnosis need to be completed.

[0016] Beneficial effects of the present invention:

[0017] The present invention is reasonably designed and discloses a circuit and method for improving the robustness of high voltage up and down of new energy vehicles, which can effectively prevent the vehicle from making false alarms, causing the vehicle to enter an over-protection state, and causing abnormal low voltage or inability to raise high voltage and other safety responses, which bring unnecessary bad experience to the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a circuit diagram of a high voltage circuit of the present invention;

[0019] Figure 2It is the upper and lower high pressure working process diagram of the present invention. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0021] Please refer to Figure 1 to Figure 2 , This embodiment provides a circuit for improving the robustness of the upper and lower high voltages of new energy vehicles, which includes a high-voltage circuit, and the components of the high-voltage circuit include a pre-charge relay K1, a main positive relay K2, a main negative relay K3, a DC positive charge relay K4, a DC negative charge relay K5, a fuse FUSE, a battery pack positive end high-voltage sampling point BAT+, a fuse rear end high-voltage sampling point FUSE+, a main positive rear end high-voltage sampling point PRE+, a battery pack negative end high-voltage sampling point BAT-, a main negative circuit detection point Rly-, a main negative rear end high-voltage sampling point PRE-, a pre-charge resistor, a main negative circuit voltage-dividing resistor, a Hall sensor HALL, a burst switch PSS and a shunt SHUNT;

[0022] The positive end of the battery pack is connected in series with one end of the fuse FUSE, the positive end high-voltage sampling point BAT+ of the battery pack is arranged at the front end of the fuse FUSE, the rear end of the fuse FUSE is connected in series with the front end of the main positive relay K2, the rear end high-voltage sampling point FUSE+ of the fuse is arranged at the rear end of the fuse FUSE, the rear end of the main positive relay K2 is connected in series with the front end of the Hall sensor HALL, the main positive rear end high-voltage sampling point PRE+ is arranged at the rear end of the main positive relay K2, the pre-charging resistor and the pre-charging relay K1 are arranged between the rear end of the fuse FUSE and the front end of the Hall sensor HALL, the pre-charging resistor is connected in series with the pre-charging relay K1, the pre-charging resistor and the pre-charging relay K1 are connected in parallel with the main positive relay K2, the rear end of the Hall sensor HALL is respectively connected in series with the positive end of the front drive, the positive end of the rear drive and the positive end of the direct current DC, and the direct current positive charging relay K4 is connected in series between the rear end of the Hall sensor HALL and the positive end of the direct current DC;

[0023] The negative terminal of the battery pack is connected in series with the front end of the detonation switch PSS, the negative terminal high-voltage sampling point BAT- of the battery pack is arranged at the front end of the detonation switch PSS, the rear end of the detonation switch PSS is connected in series with the front end of the shunt SHUNT, the rear end of the shunt SHUNT is connected in series with the front end of the main negative relay K3, the rear end of the main negative relay K3 is respectively connected in series with the negative end of the front drive, the negative end of the rear drive and the negative end of the direct current DC, the main negative circuit voltage-dividing resistor is connected in series with the main negative circuit detection point Rly-, the main negative circuit voltage-dividing resistor and the main negative circuit detection point Rly- are connected in parallel with the main negative relay K3, the main negative rear end high-voltage sampling point PRE- is arranged at the rear end of the main negative relay K3, and the DC charging negative relay K5 is connected in series between the rear end of the main negative relay K3 and the negative end of the direct current DC.

[0024] A method based on improving the robustness of high voltage up and down circuits of new energy vehicles. In the high voltage up process of the high voltage circuit, the relay drive level diagnosis, the high voltage sampling circuit diagnosis, and the relay rationality diagnosis are completely decoupled. The relay drive level fault and the high voltage sampling circuit fault do not inhibit the high voltage, but at the same time, the diagnosis of the relay rationality fault is not inhibited. In the whole high voltage up process, the following three faults are used to implement the protection; all other faults are finally responded to and processed by the following three faults (prohibiting the high voltage up): 1) The positive main relay or the pre-charging relay is stuck: prevent the high voltage from continuing to be applied, causing the main negative relay to be further stuck; 2) Pre-charging timeout: the pre-charging is unsuccessful and the high voltage cannot be applied; 3) Pre-charging overcurrent: prohibiting the high voltage up to prevent the risk of burning the high voltage circuit during the pre-charging period.

[0025] As a further improvement of the present invention, the upper and lower high voltage timing sequence of the high voltage circuit is closing the main negative → closing the pre-charge → closing the main positive → disconnecting the pre-charge → disconnecting the main positive → disconnecting the main negative.

[0026] As a further improvement of the present invention, the high-voltage circuit needs to complete the following points before making a high-voltage request: a. Complete the BMS initialization signal diagnosis, including the bottom-level sampling validity diagnosis of 6 voltage sampling points, the 6 voltage sampling points include the battery pack positive terminal sampling voltage BAT+, the fuse rear end sampling voltage FUSE+, the main positive rear end sampling voltage PRE+, the battery pack negative terminal sampling voltage BAT-, the main negative sampling voltage Rly- and the main negative rear end sampling voltage PRE-; b. Complete the high-voltage sampling circuit diagnosis, including the battery pack positive terminal sampling voltage, the fuse rear end sampling voltage BAT+, the fuse rear end sampling voltage FUSE+, and the main negative rear end sampling voltage PRE-; c. Complete the relay drive level diagnosis in the non-activated working condition; d. Complete the adhesion diagnosis of the main positive relay K2 and the main negative relay K3, and the adhesion diagnosis of the main positive relay K2 and the pre-charge relay K1;

[0027] As a further improvement of the present invention, the following points need to be completed during the high-voltage process in the high-voltage circuit: a. Complete the diagnosis of the main negative relay K3 being stuck in disconnection, and complete the diagnosis of the pre-charge relay K1 being stuck in disconnection; b. Complete the diagnosis of the fuse FUSE open circuit; c. Complete the diagnosis of the main positive and rear end sampling voltage PRE+ sampling circuit and the battery pack negative end sampling voltage BAT- sampling circuit; d. Complete the relevant diagnosis of the pre-charge relay K1: high-voltage circuit pre-charge timeout or high-voltage circuit pre-charge overcurrent; e. Complete the relay drive level diagnosis during the activation condition.

[0028] As a further improvement of the present invention, when the high-voltage circuit is in a high-voltage state, it is necessary to complete the abnormal disconnection diagnosis of the main positive relay K2 or the main negative relay K3.

[0029] As a further improvement of the present invention, after the high-voltage circuit has a high-voltage request, it is necessary to complete the adhesion diagnosis of the main positive relay K2 and the main negative relay K3 and the high-voltage circuit discharge timeout diagnosis.

[0030] At the same time, this embodiment also provides a diagnosis strategy table:

[0031] Relay drive level diagnosis (taking the main positive as an example)

[0032]

[0033] High voltage sampling rationality diagnosis:

[0034]

[0035]

[0036]

[0037] Relay rationality diagnosis:

[0038]

[0039]

[0040]

[0041]

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A circuit for improving the robustness of upper and lower high voltage of new energy vehicles, characterized in that: It includes a high-voltage circuit, and the components of the high-voltage circuit include a pre-charge relay K1, a main positive relay K2, a main negative relay K3, a DC positive charge relay K4, a DC negative charge relay K5, a fuse FUSE, a battery pack positive end high-voltage sampling point BAT+, a fuse rear end high-voltage sampling point FUSE+, a main positive rear end high-voltage sampling point PRE+, a battery pack negative end high-voltage sampling point BAT-, a main negative circuit detection point Rly-, a main negative rear end high-voltage sampling point PRE-, a pre-charge resistor, a main negative circuit voltage-dividing resistor, a Hall sensor HALL, a detonation switch PSS and a shunt SHUNT; The positive end of the battery pack is connected in series with one end of the fuse FUSE, the positive end high-voltage sampling point BAT+ of the battery pack is arranged at the front end of the fuse FUSE, the rear end of the fuse FUSE is connected in series with the front end of the main positive relay K2, the rear end high-voltage sampling point FUSE+ of the fuse is arranged at the rear end of the fuse FUSE, the rear end of the main positive relay K2 is connected in series with the front end of the Hall sensor HALL, the main positive rear end high-voltage sampling point PRE+ is arranged at the rear end of the main positive relay K2, the pre-charging resistor and the pre-charging relay K1 are arranged between the rear end of the fuse FUSE and the front end of the Hall sensor HALL, the pre-charging resistor is connected in series with the pre-charging relay K1, the pre-charging resistor and the pre-charging relay K1 are connected in parallel with the main positive relay K2, the rear end of the Hall sensor HALL is respectively connected in series with the positive end of the front drive, the positive end of the rear drive and the positive end of the direct current DC, and the direct current positive charging relay K4 is connected in series between the rear end of the Hall sensor HALL and the positive end of the direct current DC; The negative terminal of the battery pack is connected in series with the front end of the detonation switch PSS, the negative terminal high-voltage sampling point BAT- of the battery pack is arranged at the front end of the detonation switch PSS, the rear end of the detonation switch PSS is connected in series with the front end of the shunt SHUNT, the rear end of the shunt SHUNT is connected in series with the front end of the main negative relay K3, the rear end of the main negative relay K3 is respectively connected in series with the negative end of the front drive, the negative end of the rear drive and the negative end of the direct current DC, the main negative circuit voltage-dividing resistor is connected in series with the main negative circuit detection point Rly-, the main negative circuit voltage-dividing resistor and the main negative circuit detection point Rly- are connected in parallel with the main negative relay K3, the main negative rear end high-voltage sampling point PRE- is arranged at the rear end of the main negative relay K3, and the DC charging negative relay K5 is connected in series between the rear end of the main negative relay K3 and the negative end of the direct current DC.

2. A method based on improving the robustness of the upper and lower high voltage circuits of new energy vehicles, characterized in that: During the high-voltage circuit's high-voltage process, the relay driver level diagnosis, high-voltage sampling circuit diagnosis, and relay rationality diagnosis are completely decoupled. Relay driver level faults and high-voltage sampling circuit faults do not inhibit the high voltage, but at the same time, the diagnosis of relay rationality faults is not inhibited. During the entire high-voltage process, the following three faults are used to implement the protection; all other faults are ultimately responded to and processed by the following three faults (high voltage is prohibited): 1) Positive main relay or pre-charge relay adhesion: prevent continued high voltage application, causing further adhesion of the main negative relay; 2) Pre-charge timeout: pre-charge is unsuccessful, and high voltage cannot be applied; 3) Pre-charge overcurrent: high voltage is prohibited to prevent the risk of high-voltage circuit burning during pre-charge.

3. A method for improving the robustness of upper and lower high voltage circuits of new energy vehicles according to claim 2, characterized in that: The upper and lower high voltage timing sequence of the high voltage circuit is closing the main negative → closing the pre-charge → closing the main positive → disconnecting the pre-charge → disconnecting the main positive → disconnecting the main negative.

4. A method for improving the robustness of upper and lower high voltage circuits of new energy vehicles according to claim 3, characterized in that: The high-voltage circuit needs to complete the following points before making a high-voltage request: a. Complete the BMS initialization signal diagnosis, including the bottom-level sampling validity diagnosis of 6 voltage sampling points. The 6 voltage sampling points include the battery pack positive terminal sampling voltage BAT+, the fuse back-end sampling voltage FUSE+, the main positive back-end sampling voltage PRE+, the battery pack negative terminal sampling voltage BAT-, the main negative sampling voltage Rly- and the main negative back-end sampling voltage PRE-; b. Complete the high-voltage sampling circuit diagnosis, including the battery pack positive terminal sampling voltage, the fuse back-end sampling voltage BAT+, the fuse back-end sampling voltage FUSE+, and the main negative back-end sampling voltage PRE-; c. Complete the relay drive level diagnosis under non-activated working conditions; d. Complete the adhesion diagnosis of the main positive relay K2 and the main negative relay K3, and the adhesion diagnosis of the main positive relay K2 and the pre-charge relay K1.

5. A method for improving the robustness of upper and lower high voltage circuits of new energy vehicles according to claim 4, characterized in that: The following points need to be completed during the high-voltage process in the high-voltage circuit: a. Complete the diagnosis of the main negative relay K3 being stuck in disconnection, and complete the diagnosis of the pre-charge relay K1 being stuck in disconnection; b. Complete the diagnosis of the fuse FUSE open circuit; c. Complete the diagnosis of the main positive and rear end sampling voltage PRE+ sampling line and the battery pack negative end sampling voltage BAT- sampling line; d. Complete the relevant diagnosis of the pre-charge relay K1: high-voltage circuit pre-charge timeout or high-voltage circuit pre-charge overcurrent; e. Complete the relay drive level diagnosis during the activation condition.

6. A method for improving the robustness of upper and lower high voltage circuits of new energy vehicles according to claim 4, characterized in that: When the high-voltage circuit is in a high-voltage state, it is necessary to complete the abnormal disconnection diagnosis of the main positive relay K2 or the main negative relay K3.

7. A method for improving the robustness of upper and lower high voltage circuits of new energy vehicles according to claim 4, characterized in that: After the high-voltage circuit has a high-voltage request, the main positive relay K2 and the main negative relay K3 adhesion diagnosis and the high-voltage circuit discharge timeout diagnosis need to be completed.

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