Vehicle whole vehicle power-on circuit and control method, and vehicle

Abstract

The application provides a vehicle whole-vehicle power-on circuit, a control method and a vehicle, which omits a pre-charging relay and a pre-charging resistor, utilizes the diversity of energy transmission of an OBC+DCDC vehicle-mounted charging module, controls a main positive relay and a main negative relay to be closed after detecting a vehicle wake-up / ignition signal, and controls the high-voltage system to be powered on; when detecting a vehicle high-voltage power-off signal, the main positive relay and the main negative relay are disconnected, so that the high-voltage system is powered off, the whole-vehicle power-on and power-off are realized, the cost of the whole vehicle is reduced, the space is saved, and the failure of parts is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field related to vehicles, and particularly relates to a vehicle whole-vehicle power-on circuit, a control method and a vehicle. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] In recent years, new energy vehicles have been continuously developed, and the market share has been continuously increased. However, the high-voltage power consumption of new energy vehicles has been the focus of the market. In order to meet the increasingly complex functional and performance requirements of the whole vehicle, the number of high-voltage power consumption components of the whole vehicle is increased, and the functions of the components are increasingly diversified. The high-voltage system architecture becomes increasingly complex, which not only increases the development and after-sales maintenance costs, but also is not convenient for the vehicle manufacturer to control the high-voltage architecture.

[0004] Optimizing the high-voltage electrical architecture of the whole vehicle, unifying the architecture, reducing the cost, reducing the failure rate, improving the high-voltage safety, and being compatible with different requirements of various vehicle models, and verifying the rationality of the whole vehicle high-voltage power-on and power-off logic strategy to form a mature and stable whole vehicle high-voltage system solution are the research focus and core technology of pure electric vehicles.

[0005] At present, since the MCU and the HVAC high-voltage components have a direct current bus capacitor, when the whole vehicle is powered on, the main positive relay needs to be closed after the HV end voltage is pre-charged to 90% to 95% of the DC voltage through a pre-charging resistor. However, the pre-charging time is relatively long due to the power limitation of the resistor, and the relay sticking fault often occurs. SUMMARY

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a vehicle whole-vehicle power-on circuit, a control method and a vehicle. The OBC+DCDC vehicle charging module is used to transfer energy in multiple ways, so that the pre-charging relay and the pre-charging resistor are omitted, the whole vehicle power-on and power-off are realized, the cost of the whole vehicle is reduced, the space is saved, and the component failure is reduced.

[0007] The technical solution is as follows:

[0008] In a first aspect, a vehicle whole-vehicle power-on circuit is provided, comprising: a manual maintenance switch, a high-voltage system, a battery pack, a fast charging module and an OBC+DCDC vehicle charging module.

[0009] The manual maintenance switch is connected in series with the battery pack, the positive electrode of the battery pack is connected with the first end of a main positive relay and the first end of a fast charging relay respectively, the second end of the main positive relay is connected with the first end of the high-voltage system, and the second end of the fast charging relay is connected with the first end of the fast charging module.

[0010] The negative electrode of the battery pack is connected with the first end of the main negative relay, and the second end of the main negative relay is connected with the second end of the fast charging module.

[0011] The high-voltage system is connected with the high-voltage end of the OBC+DCDC on-board charging module.

[0012] When the vehicle wake-up / ignition signal is detected, the main positive relay and the main negative relay are controlled to be closed to power on the high-voltage system; when the vehicle high-voltage power-off signal is detected, the main positive relay and the main negative relay are controlled to be disconnected to power off the high-voltage system.

[0013] In a second aspect, a control method of a vehicle whole-vehicle power-on circuit is provided, comprising:

[0014] It is judged whether a vehicle wake-up / ignition signal is detected, and after the vehicle wake-up / ignition signal is detected, the main positive relay and the main negative relay are controlled to be closed to power on the high-voltage system.

[0015] It is judged whether a vehicle high-voltage power-off signal is detected, and after the vehicle high-voltage power-off signal is detected, the main positive relay and the main negative relay are controlled to be disconnected to power off the high-voltage system.

[0016] In a third aspect, a vehicle is provided, which adopts the vehicle whole-vehicle power-on circuit or the control method of the vehicle whole-vehicle power-on circuit.

[0017] The above one or more technical solutions have the following beneficial effects:

[0018] In the present application, the pre-charging relay and the pre-charging resistor are omitted, the diversity of OBC+DCDC energy transmission is utilized, the main positive relay and the main negative relay are controlled to be closed to power on the high-voltage system after the vehicle wake-up / ignition signal is detected, and the main positive relay and the main negative relay are disconnected to power off the high-voltage system after the vehicle high-voltage power-off signal is detected, so that the whole-vehicle power-on and power-off are realized, the cost of the vehicle is reduced, the space is saved, and the failure of parts is reduced.

[0019] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation on the present application.

[0021] Figure 1 It is an existing electric vehicle electrical architecture diagram;

[0022] Figure 2 A high-voltage electrical architecture diagram of an electric vehicle is provided for an embodiment of the present application;

[0023] Figure 3 An existing OBC and DCDC two-in-one electrical schematic diagram;

[0024] Figure 4 A slow charging power-on control flowchart is provided for an embodiment of the present application;

[0025] Figure 5 A driving or fast charging power-on control flowchart is provided for an embodiment of the present application;

[0026] Figure 6 A power-off control flowchart is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0029] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0030] As Figure 1 The existing electrical architecture of an electric vehicle is shown, since the MCU and HVAC high-voltage components have a DC bus capacitor, when the vehicle is powered on, the main positive relay needs to be closed after the HV end voltage is pre-charged to 90-95% of the DC voltage through a pre-charge resistor. The process is limited by the power of the resistor, the pre-charge time is long, and the relay sticking fault often occurs.

[0031] To solve the above problems, the present application provides a vehicle power-on circuit, as Figures 2-3 shown, comprising: a manual maintenance switch MSD, a high-voltage system HV, a fast charging module, a battery pack, and an OBC+DCDC on-board charging module;

[0032] The manual maintenance switch is connected in series with the battery pack, the positive electrode of the battery pack is connected with the first end of the main positive relay and the first end of the fast charging relay, the second end of the main positive relay is connected with the first end of the high-voltage system, and the second end of the fast charging relay is connected with the first end of the fast charging module;

[0033] The negative electrode of the battery pack is connected with the first end of the main negative relay, and the second end of the main negative relay is connected with the second end of the fast charging module;

[0034] The high-voltage system is connected with the high-voltage end of the OBC+DCDC vehicle charging module.

[0035] When the vehicle wake-up / ignition signal is detected, the main positive relay and the main negative relay are controlled to be closed to power on the high-voltage system; when the vehicle high-voltage power-off signal is detected, the main positive relay and the main negative relay are controlled to be opened to power off the high-voltage system.

[0036] The application utilizes the diversity of energy transmission of the OBC+DCDC vehicle charging module, controls the main positive relay and the main negative relay to be closed to power on the high-voltage system after detecting the vehicle wake-up / ignition signal, and controls the main positive relay and the main negative relay to be opened to power off the high-voltage system after detecting the vehicle high-voltage power-off signal, so as to realize the power-on and power-off of the whole vehicle, save the pre-charging relay and the pre-charging resistor, reduce the cost of the whole vehicle, save space, and reduce the failure of parts.

[0037] The fast-charging relay is electrically connected with the battery management system, and the action of the fast-charging relay is controlled by the battery management system.

[0038] The OBC+DCDC two-in-one topology structure is a three-port network, and the three ports are AC (power grid), HV (high voltage), and LV (battery), so that energy flow can be realized between any two ports.

[0039] Specifically, the method comprises the following steps:

[0040] Flow one: HV to AC, AC load power supply process;

[0041] Flow two: AC to HV, slow charging;

[0042] Flow three: LV to AC, AC load power supply process, and the application is less;

[0043] Flow four: AC to LV, battery charging;

[0044] Flow five: LV to HV, battery charging for HV, and the application is less;

[0045] Flow six: HV to LV, DCDC working process.

[0046] The above six energy flow modes can exist at the same time, such as flow two and flow four.

[0047] The application provides a control method of a vehicle power-on circuit, comprising the following steps:

[0048] It is judged whether a vehicle wake-up / ignition signal is detected, and after the vehicle wake-up / ignition signal is detected, the main positive relay and the main negative relay are controlled to be closed to power on the high-voltage system.

[0049] The system determines whether a vehicle high-voltage power-down signal is detected. If a vehicle high-voltage power-down signal is detected, the system controls the main positive relay and the main negative relay to disconnect, thereby powering down the high-voltage system.

[0050] In some embodiments, when a slow charging wake-up signal of the vehicle is detected, the on-board charger is controlled to pre-charge the high-voltage system;

[0051] Determine whether the difference between the high-voltage system voltage value and the DC terminal voltage value is less than a first set threshold.

[0052] If the difference between the high-voltage system voltage and the DC terminal voltage is less than the first set threshold;

[0053] Then it controls the closing of the main positive relay and the main negative relay.

[0054] In some embodiments, when a vehicle ignition signal is detected, the battery is controlled to precharge the high-voltage system.

[0055] Determine whether the difference between the high-voltage system voltage value and the DC terminal voltage value is less than a first set threshold.

[0056] If the difference between the high-voltage system voltage and the DC terminal voltage is less than the first set threshold;

[0057] Then it controls the closing of the main positive relay and the main negative relay.

[0058] In some embodiments, when a fast charging wake-up signal of the vehicle is detected, the battery is controlled to pre-charge the high-voltage system;

[0059] Determine whether the difference between the high-voltage system voltage value and the DC terminal voltage value is less than a first set threshold.

[0060] If the difference between the high-voltage system voltage and the DC terminal voltage is less than the first set threshold;

[0061] Then it controls the closing of the main positive relay and the main negative relay.

[0062] In some embodiments, when a high-voltage power-down signal is detected in the vehicle, the high-voltage system is controlled to charge the battery.

[0063] Determine whether the voltage value of the high-voltage system is less than the set second threshold.

[0064] If the voltage value of the high-voltage system is less than the set second threshold, the main positive relay and the main negative relay will be disconnected.

[0065] like Figure 4 As shown, when the vehicle's slow charging wake-up signal is detected, the high voltage is powered on, and the on-board charger (OBC) is controlled to pre-charge the high voltage system (HV).

[0066] determining whether the difference between the high-voltage system HV voltage value and the DC terminal voltage value is not greater than a first set threshold value, wherein the first set threshold value is 1%;

[0067] If the difference between the high-voltage system HV voltage value and the DC terminal voltage value is less than or equal to the first set threshold value, i.e. 1%;

[0068] then controlling the main positive relay and the main negative relay to be closed.

[0069] As shown in FIG. 1, when the running ignition signal of the vehicle is detected, high-voltage power-on is performed, and the battery LV is controlled to pre-charge the high-voltage system HV. Figure 5

[0070] determining whether the difference between the high-voltage system HV voltage value and the DC terminal voltage value is not greater than a first set threshold value, wherein the first set threshold value is 1%;

[0071] If the difference between the high-voltage system HV voltage value and the DC terminal voltage value is less than or equal to the first set threshold value, i.e. 1%;

[0072] then controlling the main positive relay and the main negative relay to be closed.

[0073] As shown in FIG. 1, when the running ignition signal of the vehicle is detected, high-voltage power-on is performed, and the battery LV is controlled to pre-charge the high-voltage system HV. Figure 5

[0074] determining whether the difference between the high-voltage system HV voltage value and the DC terminal voltage value is not greater than a first set threshold value, wherein the first set threshold value is 1%;

[0075] If the difference between the high-voltage system HV voltage value and the DC terminal voltage value is less than or equal to the first set threshold value, i.e. 1%;

[0076] then controlling the main positive relay and the main negative relay to be closed.

[0077] As shown in FIG. 1, when the running ignition signal of the vehicle is detected, high-voltage power-on is performed, and the battery LV is controlled to pre-charge the high-voltage system HV. Figure 6

[0078] determining whether the high-voltage system HV voltage value is not greater than a second set threshold value, wherein the second set threshold value is 40V;

[0079] If the high-voltage system HV voltage value is less than the second set threshold value, then controlling the main positive relay and the main negative relay to be opened.

[0080] The application also provides a vehicle adopting the vehicle whole-vehicle power-on circuit or the control method of the vehicle whole-vehicle power-on circuit.

[0081] ​​​The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A vehicle power supply circuit, characterized in that, include: Manual maintenance switch, battery pack, high voltage system, fast charging module and OBC+DCDC on-board charging module; The manual maintenance switch is connected in series with the battery pack. The positive terminal of the battery pack is connected to the first terminal of the main positive relay and the first terminal of the fast charging relay, respectively. The second terminal of the main positive relay is connected to the first terminal of the high voltage system, and the second terminal of the fast charging relay is connected to the first terminal of the fast charging module. The negative terminal of the battery pack is connected to the first terminal of the main negative relay, and the second terminal of the main negative relay is connected to the second terminal of the fast charging module. The high-voltage system is connected to the high-voltage terminal of the OBC+DCDC on-board charging module; When a vehicle wake-up / ignition signal is detected, the main positive relay and the main negative relay are controlled to close to power on the high-voltage system; when a vehicle high-voltage power-down signal is detected, the main positive relay and the main negative relay are controlled to open to power off the high-voltage system.

2. The vehicle power-on circuit as described in claim 1, characterized in that, The high-voltage end of the OBC+DCDC vehicle charging module supplies AC load power to the grid by flowing energy from the grid end; the grid end of the OBC+DCDC vehicle charging module supplies slow charging to the high-voltage end by flowing energy from the grid end; and the battery end of the OBC+DCDC vehicle charging module supplies AC load power to the grid by flowing energy from the grid end.

3. The vehicle power-on circuit as described in claim 2, characterized in that, The OBC+DCDC on-board charging module allows energy to flow from the grid terminal to the battery terminal for charging; energy also flows from the battery terminal to the high-voltage terminal for charging; and the flow of energy from the high-voltage terminal to the battery terminal enables DC-DC operation.

4. The vehicle power-on circuit as described in claim 1, characterized in that, The fast-charging relay is electrically connected to the battery management system.

5. The control method for the vehicle's overall power-on circuit as described in any one of claims 1-4, characterized in that, include: Determine whether a vehicle wake-up / ignition signal is detected. If a vehicle wake-up / ignition signal is detected, control the main positive relay and the main negative relay to close and power on the high-voltage system. The system determines whether a vehicle high-voltage power-down signal is detected. If a vehicle high-voltage power-down signal is detected, the system controls the main positive relay and the main negative relay to disconnect, thereby powering down the high-voltage system.

6. The control method for the vehicle's overall power-on circuit as described in claim 5, characterized in that, include: When the vehicle's slow charging wake-up signal is detected, the on-board charger is controlled to pre-charge the high-voltage system. Determine whether the difference between the high-voltage system voltage value and the DC terminal voltage value is not greater than a first set threshold. If the difference between the high-voltage system voltage and the DC terminal voltage is less than or equal to the first set threshold; Then control the closure of the main positive relay and the main negative relay.

7. The control method for the vehicle's overall power-on circuit as described in claim 5, characterized in that, Also includes: When the vehicle's ignition signal is detected, the battery is controlled to precharge the high-voltage system. Determine whether the difference between the high-voltage system voltage value and the DC terminal voltage value is not greater than a first set threshold. If the difference between the high-voltage system voltage and the DC terminal voltage is less than or equal to the first set threshold; Then control the closure of the main positive relay and the main negative relay.

8. The control method for the vehicle's overall power-on circuit as described in claim 5, characterized in that, Also includes: When the vehicle's fast charging wake-up signal is detected, the battery is controlled to pre-charge the high-voltage system. Determine whether the difference between the high-voltage system voltage value and the DC terminal voltage value is not greater than a first set threshold. If the difference between the high-voltage system voltage and the DC terminal voltage is less than or equal to the first set threshold; Then control the closure of the main positive relay and the main negative relay.

9. The control method for the vehicle's overall power-on circuit as described in claim 5, characterized in that, Also includes: When a high-voltage power-down signal is detected in the vehicle, the high-voltage system is controlled to charge the battery. Determine whether the voltage value of the high-voltage system is not greater than the set second threshold. If the voltage value of the high-voltage system is less than or equal to the set second threshold, then the main positive relay and the main negative relay are disconnected.

10. A vehicle employing the vehicle power-on circuit as described in any one of claims 1-4, or the control method for the vehicle power-on circuit as described in any one of claims 5-9.

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