A high-voltage robustness circuit and method for improving new energy vehicles

Abstract

The application discloses a kind of to improve new energy automobile up and down high pressure robustness circuit and method thereof, it includes high voltage loop, the components of the high voltage loop include pre-charge relay K1, main positive relay K2, main negative relay K3, DC charging positive relay K4, DC charging negative relay K5, fuse FUSE, battery pack positive end high voltage sampling point BAT+, fuse rear end high voltage sampling point FUSE+, main positive rear end high voltage sampling point PRE+, battery pack negative end high voltage sampling point BAT-, main negative loop detection point Rly-, main negative rear end high voltage sampling point PRE-, pre-charge resistance, main negative loop voltage dividing resistance, hall sensor HALL, point explosion switch PSS and shunt SHUNT.The application can effectively prevent vehicle false alarm, cause vehicle to enter overprotection state, abnormal down high pressure or unable to high pressure etc. safety response, bring unnecessary bad experience to driver.

Description

Technical Field

[0001] This invention relates to the field of improving the robustness of new energy vehicles to high voltage levels, and specifically to a method for improving the robustness of new energy vehicles to high voltage levels. Background Technology

[0002] With the rapid development of the new energy vehicle industry, it is currently impossible to completely shield high and low voltage electromagnetic interference in new energy vehicles. At the same time, the high-voltage circuit, insulation circuit, and sampling circuit are prone to cross-current. This ultimately causes abnormal sampling signals, leading to abnormal high-voltage sampling and consequently, misdiagnosis of relay malfunction.

[0003] To address this issue, we designed a method to improve the robustness of new energy vehicles under high voltage, thus solving the problem. Summary of the Invention

[0004] To address the aforementioned technical problems in existing technologies, this invention provides a method for improving the robustness of new energy vehicles in applying and removing high voltage, preventing false alarms that could cause the vehicle to enter an overprotection state, resulting in abnormal high voltage application or failure to apply high voltage, thus avoiding unnecessary adverse experiences for drivers.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A circuit for improving the robustness of high voltage in new energy vehicles includes a high voltage circuit. 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 charging positive relay K4, a DC charging negative relay K5, a fuse FUSE, a high voltage sampling point BAT+ at the positive terminal of the battery pack, a high voltage sampling point FUSE+ at the rear end of the fuse, a high voltage sampling point PRE+ at the rear end of the main positive relay, a high voltage sampling point BAT- at the negative terminal of the battery pack, a detection point Rly- in the main negative circuit, a high voltage sampling point PRE- at the rear end of the main negative relay, a pre-charge resistor, a voltage divider resistor in the main negative circuit, a Hall sensor HALL, a detonation switch PSS, and a shunt.

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

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

[0009] A method for improving the robustness of high-voltage circuits in new energy vehicles is proposed. During the high-voltage circuit's high-voltage connection process, relay driver-level diagnostics, high-voltage sampling line diagnostics, and relay rationality diagnostics are completely decoupled. Faults in the relay driver level and high-voltage sampling line do not inhibit high-voltage connection, but they also do not inhibit the diagnosis of relay rationality faults. Throughout the high-voltage connection process, the following three faults provide safety protection; all other faults are ultimately handled by the following three faults (prohibiting high-voltage connection): 1) Positive main relay or pre-charge relay sticking: preventing further high-voltage connection and causing further sticking of the main and negative relays; 2) Pre-charge timeout: unsuccessful pre-charge, preventing high-voltage connection; 3) Pre-charge overcurrent: prohibiting high-voltage connection to prevent risks such as high-voltage circuit burnout during pre-charge.

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

[0011] In the above technical solution, the high voltage sequence of the high voltage circuit is: closing the main negative → closing the precharge → closing the main positive → opening the precharge → opening the main positive → opening the main negative.

[0012] In the above technical solution, the high-voltage circuit needs to complete the following steps before requesting high voltage: a) Complete BMS initialization signal diagnosis, including bottom-level sampling validity diagnosis of 6 voltage sampling points, including battery pack positive terminal sampling voltage BAT+, fuse back-end sampling voltage FUSE+, main positive back-end sampling voltage PRE+, battery pack negative terminal sampling voltage BAT-, main negative sampling voltage Rly-, and main negative back-end sampling voltage PRE-; b) Complete high-voltage sampling line diagnosis, including battery pack positive terminal sampling voltage, fuse back-end sampling voltage BAT+, fuse back-end sampling voltage FUSE+, and main negative back-end sampling voltage PRE-; c) Complete relay drive level diagnosis under inactive operating conditions; d) Complete diagnosis of adhesion between main positive relay K2 and main negative relay K3, and adhesion between main positive relay K2 and precharge relay K1.

[0013] In the above technical solution, the following points need to be completed during the high-voltage process of the high-voltage circuit: a) complete the diagnosis of the main negative relay K3 being stuck in the open position and the pre-charge relay K1 being stuck in the open position; b) complete the diagnosis of the fuse (FUSE) being open; c) complete the diagnosis of the sampling line of the main positive terminal sampling voltage PRE+ and the sampling line of the battery pack negative terminal sampling voltage BAT-; 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 stage diagnosis during the activation condition.

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

[0015] In the above technical solution, after the high voltage request is made in the high voltage circuit, it is necessary to complete the diagnosis of adhesion between the main positive relay K2 and the main negative relay K3, and the diagnosis of high voltage circuit discharge timeout.

[0016] The beneficial effects of this invention are:

[0017] This invention is reasonably designed and discloses a circuit and method for improving the robustness of high voltage input and output in new energy vehicles. It can effectively prevent vehicles from falsely reporting errors, causing them to enter an overprotection state, resulting in abnormal high voltage input or failure to input high voltage, which would bring unnecessary adverse experiences to the driver. Attached Figure Description

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

[0019] Figure 2This is a flowchart of the high-pressure operation process of the present invention. Detailed Implementation

[0020] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Please refer to Figures 1 to 2 This embodiment provides a circuit to improve the robustness of high voltage in new energy vehicles. 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 charging positive relay K4, a DC charging negative relay K5, a fuse FUSE, a high voltage sampling point BAT+ at the positive terminal of the battery pack, a high voltage sampling point FUSE+ at the rear end of the fuse, a high voltage sampling point PRE+ at the rear end of the main positive relay, a high voltage sampling point BAT- at the negative terminal of the battery pack, a detection point Rly- in the main negative circuit, a high voltage sampling point PRE- at the rear end of the main negative relay, a pre-charge resistor, a voltage divider resistor in the main negative circuit, a Hall sensor HALL, a detonation switch PSS, and a shunt.

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

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

[0024] A method for improving the robustness of high-voltage circuits in new energy vehicles is proposed. During the high-voltage circuit's high-voltage connection process, relay driver-level diagnostics, high-voltage sampling line diagnostics, and relay rationality diagnostics are completely decoupled. Faults in the relay driver level and high-voltage sampling line do not inhibit high-voltage connection, but they also do not inhibit the diagnosis of relay rationality faults. Throughout the high-voltage connection process, the following three faults provide safety protection; all other faults are ultimately handled by the following three faults (prohibiting high-voltage connection): 1) Positive main relay or pre-charge relay sticking: preventing further high-voltage connection and causing further sticking of the main and negative relays; 2) Pre-charge timeout: unsuccessful pre-charge, preventing high-voltage connection; 3) Pre-charge overcurrent: prohibiting high-voltage connection to prevent risks such as high-voltage circuit burnout during pre-charge.

[0025] As a further improvement of the present invention, the high voltage circuit's high voltage sequence is: closing the main negative → closing the precharge → closing the main positive → opening the precharge → opening the main positive → opening the main negative.

[0026] As a further improvement of the present invention, the high-voltage circuit needs to complete the following steps before requesting high voltage: a) Complete BMS initialization signal diagnosis, including bottom-level sampling validity diagnosis of 6 voltage sampling points, including battery pack positive terminal sampling voltage BAT+, fuse back-end sampling voltage FUSE+, main positive back-end sampling voltage PRE+, battery pack negative terminal sampling voltage BAT-, main negative sampling voltage Rly-, and main negative back-end sampling voltage PRE-; b) Complete high-voltage sampling line diagnosis, including battery pack positive terminal sampling voltage, fuse back-end sampling voltage BAT+, fuse back-end sampling voltage FUSE+, and main negative back-end sampling voltage PRE-; c) Complete relay drive level diagnosis under inactive operating conditions; d) Complete diagnosis of adhesion between main positive relay K2 and main negative relay K3, and adhesion between main positive relay K2 and precharge 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 the open position and the pre-charge relay K1 being stuck in the open position; b) complete the diagnosis of the fuse FUSE being open; c) complete the diagnosis of the sampling line of the main positive terminal sampling voltage PRE+ and the sampling line of the battery pack negative terminal sampling voltage BAT-; 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 stage diagnosis during the activation condition.

[0028] As a further improvement of the present invention, when the high-voltage circuit is under high-voltage conditions, it is necessary to complete the diagnosis of abnormal disconnection 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 request in the high voltage circuit, it is necessary to complete the diagnosis of adhesion between the main positive relay K2 and the main negative relay K3, and the diagnosis of high voltage circuit discharge timeout.

[0030] Meanwhile, this embodiment also provides a diagnostic strategy table:

[0031] Relay driver-level diagnostics (taking the main positive relay 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 this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which 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 solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-voltage robustness circuit for improving the up and down of a new energy vehicle, characterized in that, It includes a high-voltage circuit, the components of which include a pre-charge relay K1, a main positive relay K2, a main negative relay K3, a DC charging positive relay K4, a DC 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 PRE+, a battery pack negative end high-voltage sampling point BAT-, a main negative loop detection point Rly-, a main negative rear end high-voltage sampling point PRE-, a pre-charge resistor, a main negative loop voltage dividing resistor, a Hall sensor HALL, a point explosion 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 battery pack positive end high-voltage sampling point BAT+ 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 fuse rear end high-voltage sampling point 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-charge resistor and the pre-charge relay K1 are arranged between the rear end of the fuse FUSE and the front end of the Hall sensor HALL, the pre-charge resistor and the pre-charge relay K1 are connected in series, the pre-charge resistor and the pre-charge relay K1 are connected in parallel with the main positive relay K2, the rear end of the Hall sensor HALL is connected in series with the positive end of the front drive, the positive end of the rear drive, and the positive end of the DC DC respectively, and the DC charging positive relay K4 is connected in series between the rear end of the Hall sensor HALL and the positive end of the DC DC; The negative end of the battery pack is connected in series with the front end of the point explosion switch PSS, the battery pack negative end high-voltage sampling point BAT- is arranged at the front end of the point explosion switch PSS, the rear end of the point explosion 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 connected in series with the negative end of the front drive, the negative end of the rear drive, and the negative end of the DC DC respectively, the main negative loop voltage dividing resistor is connected in series with the main negative loop detection point Rly-, the main negative loop voltage dividing resistor and the main negative loop 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 DC DC.

2. The method for improving the high-voltage robustness of a new energy vehicle based on the circuit of claim 1, characterized in that, In the high-voltage process of the high-voltage circuit, the relay drive stage diagnosis, the high-voltage sampling line diagnosis and the relay rationality diagnosis are completely decoupled, the relay drive stage fault and the high-voltage sampling line fault do not inhibit the diagnosis of the relay rationality fault, and the whole high-voltage process is protected by the following three faults; all other faults are finally responded by the following three faults: 1) positive main relay or pre-charging relay sticking: preventing continuous high-voltage to cause further sticking of the main negative relay; 2) pre-charging timeout: pre-charging is unsuccessful, and the high-voltage cannot be applied; 3) pre-charging overcurrent: inhibiting the high-voltage to prevent the high-voltage circuit from burning down during pre-charging.

3. The method for improving the high-voltage robustness of a new energy vehicle according to claim 2, characterized in that, The high-voltage circuit timing of the high-voltage and the low-voltage is as follows: closing the main negative, closing the pre-charging, closing the main positive, opening the pre-charging, opening the main positive, and opening the main negative.

4. The method for improving the high-voltage robustness circuit on the new energy vehicle according to claim 3, characterized in that, Before the high-voltage request of the high-voltage circuit, the following points need to be completed: a, completing the BMS initialization signal diagnosis, including the bottom sampling validity diagnosis of six voltage sampling points, including the battery pack positive sampling voltage BAT+, the fuse rear sampling voltage FUSE+, the main positive rear sampling voltage PRE+, the battery pack negative sampling voltage BAT-, the main negative sampling voltage Rly- and the main negative rear sampling voltage PRE-; b, completing the high-voltage sampling line diagnosis, including the battery pack positive sampling voltage fuse rear sampling voltage BAT+, the fuse rear sampling voltage FUSE+ and the main negative rear sampling voltage PRE-; c, completing the relay drive stage diagnosis in the non-activated condition; d, completing the main positive relay K2 and the main negative relay K3 sticking diagnosis, and the main positive relay K2 and the pre-charging relay K1 sticking diagnosis.

5. The method for improving the high-voltage robustness circuit on the new energy vehicle according to claim 4, characterized in that, In the high-voltage process of the high-voltage circuit, the following points need to be completed: a, completing the main negative relay K3 stuck in the open diagnosis, and completing the pre-charging relay K1 stuck in the open diagnosis; b, completing the fuse FUSE open circuit diagnosis; c, completing the main positive rear sampling voltage PRE+ sampling line and the battery pack negative sampling voltage BAT- sampling line diagnosis; d, completing the related diagnosis of the pre-charging relay K1: high-voltage circuit pre-charging timeout or high-voltage circuit pre-charging overcurrent; e, completing the relay drive stage diagnosis in the activated condition.

6. The method for improving the high-voltage robustness circuit on the new energy vehicle according to claim 4, characterized in that, When the high-voltage circuit is in the high-voltage state, the main positive relay K2 or the main negative relay K3 abnormal disconnection diagnosis needs to be completed.

7. The method for improving the high-voltage robustness of a circuit on a new energy vehicle according to claim 4, characterized in that, After the low-voltage request of the high-voltage circuit, the main positive relay K2 and the main negative relay K3 sticking diagnosis and the high-voltage circuit discharge timeout diagnosis need to be completed.

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