A low-voltage power supply intelligent protection system for hydrogen-powered vehicles and a control method thereof

Abstract

The present invention discloses a low-voltage power supply intelligent protection system for hydrogen-powered vehicles and a control method thereof. The low-voltage power supply intelligent protection system includes a low-voltage battery, a low-voltage power supply management relay, an emergency start switch, a vehicle electronic control system, and a low-voltage power supply wiring harness. The vehicle electronic control system is powered by different low-voltage power supply management relays; when it is detected that the power of the low-voltage battery meets the preset conditions, the low-voltage power supply protection relay is controlled to be disconnected; after the emergency start switch is pressed, the low-voltage power supply protection relay is controlled to be closed so that the vehicle can start normally; after the vehicle is powered off, the second control system of the vehicle electronic control system controls the delayed power-off relay to be disconnected after the vehicle completes the preset function. The low-voltage power supply intelligent protection system can minimize the static energy consumption of the vehicle, further extend the static parking time of the whole vehicle, and ensure the user's vehicle needs and vehicle safety.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage power supply systems for all vehicles, including traditional fuel vehicles, pure electric vehicles, hydrogen fuel cell vehicles, etc., and specifically to a low-voltage power supply intelligent protection system for hydrogen vehicles and a control method thereof. Background Art

[0002] At present, the degree of intelligence and electrification of vehicles is getting higher and higher. More and more electrical devices are actually monitoring the status of the whole vehicle during the power-off and parking period to ensure the safety and convenience of the whole vehicle. However, too many electrical devices are involved in the work during the parking period, which will not only shorten the parking time of the vehicle, but also cause the vehicle to be unable to start again after a long parking period, and bring certain safety hazards to the whole vehicle. To solve such problems, increasing the capacity of the low-voltage battery, automatically starting the engine to charge the low-voltage battery during the parking period (traditional fuel vehicles), or automatically starting the high-voltage system to charge the low-voltage battery (new energy vehicles) have been widely used.

[0003] Increasing the battery capacity will increase its own volume, bringing challenges to the layout of the battery in the vehicle; automatically starting the engine or high-voltage system while the vehicle is parked can solve the problem of low-voltage battery power supply, but it increases safety hazards to a certain extent; especially for hydrogen-powered vehicles, due to the electrical complexity of the hydrogen energy system, the vehicle's static power consumption is relatively large compared to other types of vehicles. No matter which of the above methods is adopted, it will bring layout problems or safety hazards. This patent will focus on solving such problems. Summary of the invention

[0004] In view of this, the present invention provides a low-voltage power supply intelligent protection system and control method for a hydrogen-powered vehicle, which avoids power failure of the low-voltage power supply through power distribution and corresponding control, prolongs the vehicle's stationary parking time, and improves the safety of the vehicle during stationary parking.

[0005] In order to solve the above problems, an embodiment of the present invention provides a low-voltage power supply intelligent protection system for hydrogen-powered vehicles, and the low-voltage power supply intelligent protection system includes a low-voltage battery, a low-voltage power supply management relay, an emergency start switch, a vehicle electronic control system, and a low-voltage power supply wiring harness. The vehicle electronic control system includes a first control system, a second control system, a third control system, and a fourth control system; the low-voltage power supply management relay includes a low-voltage power supply protection relay, an ignition key ACC position relay, an ignition key ON position relay, and a delayed power-off relay; the low-voltage power supply wiring harness contains five positive main circuit wires (L0, L1, L2, L3, L4) and one main circuit negative wire; the low-voltage battery is respectively connected to different low-voltage power supply management relays and their positive main circuit wires; the vehicle electronic control system is respectively connected to different positive main circuit wires;

[0006] Furthermore, the first control system is a vehicle safety monitoring electronic control system, which is directly connected to the low-voltage battery through the low-voltage power supply harness;

[0007] Furthermore, the second control system is a power protection control electronic control system, which is connected to the low-voltage battery through the low-voltage power supply harness and the low-voltage power protection relay respectively;

[0008] Further, the third control system is an ignition key switch control electronic control system, which is connected to the low-voltage battery through the low-voltage power supply harness, the ignition key ACC position relay or the ignition key ON position relay;

[0009] Further, the fourth control system is a delayed power-off electric control system, which is connected to the low-voltage battery through the low-voltage power supply harness and the delayed power-off relay, or directly connected to the low-voltage battery through the low-voltage power supply harness;

[0010] Furthermore, the first control system is connected to the emergency start switch via a signal acquisition wire;

[0011] Further, the first control system is connected to the low-voltage power supply protection relay, the ignition key ACC position relay, and the ignition key ON position relay through control wires;

[0012] Furthermore, the second control system is connected to the delayed power-off relay via a control wire.

[0013] The present invention also provides a method for controlling a low-voltage power supply intelligent protection system of a hydrogen-powered vehicle: the first control system detects the ignition key position, the emergency start switch, and the low-voltage battery power status information, and controls the closing / opening of the low-voltage power supply protection relay, the ignition key ACC position relay, and the ignition key ON position relay according to the above status information; the second control system controls the closing / opening of the delayed power-off relay according to the vehicle status, and supplies power to / off the fourth control system.

[0014] Furthermore, during the period when the vehicle is stationary, when the first control system detects that the power level of the low-voltage battery meets the first preset value, it controls the low-voltage power supply protection relay to be disconnected, so that the second control system is powered off; when the vehicle is ignited and started, when the first control system detects that the power level of the low-voltage battery meets the first preset value, it sends an alarm and prompt information to the instrument; when the vehicle ignition key is turned off, after the fourth control system completes the power-off related functions, the second control system controls the delayed power-off relay to be disconnected, or the fourth control system controls the internal delay relay to be disconnected; the driver presses the emergency start switch according to the instrument prompt information, and the first control system detects that the switch is closed, controls the low-voltage power supply protection relay to be closed, and powers on the second control system; after the emergency start switch is pressed, the vehicle is requested to start within the preset time limit, and the first control system controls to complete the vehicle emergency start requirement, so that the vehicle completes the low-voltage power-on; after the emergency start switch is pressed, if the vehicle is not requested to start within the preset time limit, the first control system controls the low-voltage power supply protection relay to be disconnected.

[0015] Compared with the prior art, the low-voltage power supply intelligent protection system and control method for hydrogen-powered vehicles provided in the embodiments of the present invention have at least the following beneficial effects: relative to the prior art, the embodiments of the present invention only add an emergency start switch and an ordinary relay (for delayed power-off) to distribute power to the vehicle's electrical devices in a more practical manner according to their functional requirements, and combine with relevant automatic control logic to minimize the static energy consumption of the vehicle, so that the entire vehicle enters a deep sleep state, thereby protecting the low-voltage power supply, avoiding low-voltage battery depletion, further extending the static parking time of the entire vehicle, improving the safety of the vehicle during static parking, and ensuring the user's vehicle needs and vehicle safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic diagram of the structure of a low-voltage power supply intelligent protection system for a hydrogen-powered vehicle according to Embodiment 1 of the present invention;

[0017] Figure 2 Schematic diagram of the structure of the low-voltage power supply intelligent protection system of the hydrogen-powered vehicle according to the second embodiment of the present invention;

[0018] Figure 3 This is a flow chart of a vehicle power-on control method of a hydrogen vehicle low-voltage power supply intelligent protection system according to Embodiment 1 of the present invention;

[0019] Figure 4 It is a flow chart of the whole vehicle power-off control method of the low-voltage power supply intelligent protection system of the hydrogen energy vehicle in embodiment 1 of the present invention.

[0020] In the figure: 1- low voltage battery, 2- first control system, 3- second control system, 4- ignition key ACC power supply control system, 5- ignition key ON power supply control system, 6- fourth control system, 7- ECU_C and ECU_D, 8- ECU_AC and ECU_AD, 9- emergency start switch. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for clarity and brevity, the description of known functions and structures is omitted.

[0022] Please refer to Figure 1 Embodiment 1 of the present invention provides a low-voltage power supply intelligent protection system for a hydrogen-powered vehicle, comprising a low-voltage battery 1, a low-voltage power supply management relay, an emergency start switch 9, a vehicle electronic control system, and a low-voltage power supply harness. The vehicle electronic control system comprises a first control system 2, a second control system 3, a third control system, and a fourth control system 6; the low-voltage power supply management relay comprises a low-voltage power supply protection relay K0, an ignition key ACC position relay K1, an ignition key ON position relay K2, and a delayed power-off relay K3; the low-voltage power supply harness has five positive main circuit wires and one main circuit negative wire; the low-voltage battery 1 is respectively connected to different low-voltage power supply management relays and their positive main circuit wires; the vehicle electronic control system is respectively connected to different positive main circuit wires;

[0023] Furthermore, the first control system 2 is a vehicle safety monitoring electronic control system, which is directly connected to the low-voltage battery 1 through a low-voltage power supply harness L4 and a negative wire. The first control system 2 includes control units such as ECU0 and ECU1. After the ignition key of the vehicle is powered off, the actual circuits of ECU0 and ECU1 are not powered off while the vehicle is stationary, and they are in a low-power consumption mode to monitor the safety status of the vehicle. ECU0 and ECU1 can be a body control system BCM, a keyless entry and start system PEPS, a vehicle controller VCU, a hydrogen concentration monitoring control unit, a low-voltage battery monitoring unit, etc.;

[0024] ECU0 (such as BCM or PEPS) is connected to the emergency start switch 9 through a signal acquisition wire to collect the state of the emergency start switch 9. At the same time, ECU0 is respectively connected to the low-voltage power supply protection relay K0, the ignition key ACC position relay K1, and the ignition key ON position relay K2 through control wires to control the closing and opening of K0, K1, and K2 respectively according to different vehicle states;

[0025] Furthermore, the second control system 3 is a power protection control electronic control system, which is connected to the low-voltage battery 1 through the low-voltage power supply harness L0, the negative wire, and the low-voltage power protection relay K0. The second control system 3 includes control units such as ECU_a and ECU_b. After the ignition key is turned off, the actual circuit of ECU_a and ECU_b is not powered off for a long time when the vehicle is at rest, and is in a low power consumption mode. During the period when the vehicle is at rest, when ECU0 detects that the power of the low-voltage battery 1 meets the first preset value, it controls K0 to disconnect, so that ECU_a and ECU_b are powered off, and the vehicle is in the lowest power consumption mode at this time. ECU_a and ECU_b can be instruments, tire pressure monitoring systems, audio and video entertainment navigation systems, vehicle-mounted monitoring terminals TBOX, etc.

[0026] ECU_a is connected to the delayed power-off relay K3 via a control wire.

[0027] Further, the third control system is an ignition key switch control electronic control system, which includes an ignition key ACC power supply control system 4 and an ignition key ON power supply control system 5. The ignition key ACC power supply control system 4 includes ECU_A, ECU_B, etc. ECU_A and ECU_B can be a battery management system BMS, a motor controller MCU, an electronic power steering system, a fuel cell control system, a fuel cell high-voltage DCDC system, etc. The ignition key ACC power supply control system 5 includes ECU_AA, ECU_AB, etc. ECU_AA and ECU_AB can be an ADAS control system, a gear controller, a low-voltage battery charging system DCL, a hydrogen tank control system, etc.

[0028] ECU_A and ECU_B are connected to the low-voltage battery 1 through the low-voltage power supply harness L1, the negative wire, and the ignition key ACC position relay K1;

[0029] ECU_AA and ECU_AB are connected to the low-voltage battery 1 through the low-voltage power supply harness L2, the negative wire, and the ignition key ON position relay K2;

[0030] Furthermore, the fourth control system 6 is a delayed power-off electronic control system, which is connected to the low-voltage battery 1 through the low-voltage power supply harness L3, the delayed power-off relay K3, and the negative wire; or is directly connected to the low-voltage battery 1 through the low-voltage power supply harness L4 and the negative wire.

[0031] refer to Figure 2 , Figure 2 is a schematic diagram of the structure of the low-voltage power supply intelligent protection system of the hydrogen energy vehicle according to the second embodiment of the present invention, and Figure 1 The difference is that when there are more electrical systems in the vehicle, the power supply harness branch is increased to reduce the current of each power supply circuit. The third control system is increased to include ECU_C, ECU_D 7 and CU_AC, ECU_AD8. ECU_C and ECU_D7 are connected to the low-voltage battery 1 through the newly added low-voltage power supply branch harness L1a, the negative wire, and the ignition key ACC position relay K1; CU_AC and ECU_AD 8 are connected to the low-voltage battery 1 through the newly added low-voltage power supply branch harness L2a, the negative wire, and the ignition key ON position relay K2.

[0032] refer to Figure 3 The embodiment of the present invention also provides a power-on control method for a low-voltage power supply intelligent protection system of a hydrogen-powered vehicle, and the structural schematic diagram is shown in FIG. Figure 1 , and its control methods include:

[0033] Step F1, after the vehicle ignition key is turned off, the vehicle is in a stationary state;

[0034] Step F2, when the vehicle is stationary, ECU0 such as BCM or PEPS enters sleep mode and monitors in real time non-key position change wake-up events or non-one-touch start button action wake-up events;

[0035] Step F3: If ECU0 detects that the one-button start switch is pressed or the mechanical key is turned, it enters step F5, otherwise it returns to step F1;

[0036] Step F4: if ECU0 detects a non-key position change wake-up event or a non-one-touch start button action wake-up event, the vehicle is partially awakened, and only one of the related awakened first control systems is operated. After the execution is completed, the process goes to step F3;

[0037] Step F5, ECU1 such as BCM, PEPS, or low-voltage battery monitoring unit detects the low-voltage battery power status in real time;

[0038] Step F6, if the low-voltage battery power is less than S1, then go to step F7;

[0039] Step F7, the low-voltage battery is in an over-discharge state, and the vehicle can be started only after the low-voltage battery is replaced, charged or connected. If no processing is done, return to step F1;

[0040] Step F8, if the low-voltage battery power meets the first preset value, which is S1<low-voltage battery power<S2, the instrument will give a low-voltage battery power alarm, and voice / text prompt the driver to press the emergency start switch and quickly restart the ignition key, prompting the driver to perform the emergency start operation of the vehicle;

[0041] Step F9, ECU0 such as BCM and PEPS determines the state of pressing the emergency start switch;

[0042] Step F10: If S1 < low-voltage battery power < S2, and the emergency start switch is not pressed, the vehicle remains in the current state;

[0043] Step F11, if S1<low-voltage battery power<S2, and the emergency start switch is pressed, ECU0 controls K0 relay to close, supply power to ECU_a and ECU_b, and time t_E at the same time;

[0044] Step F12, ECU0 determines whether the driver completes the ignition key restart power-on request within t_E<t_limit after the emergency start switch is pressed;

[0045] Step F13, if the driver does not request to restart the power on with the ignition key within the time t_E<t_limit, ECU0 controls the K0 relay to be disconnected, and the power to ECU_a and ECU_b is cut off. After the execution is completed, the process returns to step F5;

[0046] Step F14, ECU0 determines whether the ignition key position information changes from KEY_OFF to KEY_ON;

[0047] Step F15, if the ignition key position changes quickly from KEY_OFF to KEY_ON, ECU0 sequentially completes the actions of KEY_OFF to KEY_ACC and KEY_ACC to KEY_ON;

[0048] Step F16, ECU0 determines whether the ignition key position information is from KEY_OFF to KEY_ACC;

[0049] Step F17, if the ignition key position changes from KEY_OFF to KEY_ACC, ECU0 controls K1 relay to close and supply power to ECU_A and ECU_B;

[0050] Step F18, ECU_A and ECU_B are powered on and work;

[0051] Step F19, KEY_ACC wakes up ECU_a, ECU_b, ECU_ba, and ECU_a, ECU_b, and ECU_ba work at this time. If ECU1 has not been awakened before F19, ECU1 (such as vehicle controller VCU, hydrogen concentration monitoring control unit, etc.) is awakened and works in this step;

[0052] Step F20: After step F19 is completed, whether ECU_a is initialized;

[0053] Step F21, ECU_a controls the K3 relay to close and supply power to ECU_aa;

[0054] Step F22, ECU_aa is powered on and starts working;

[0055] Step F23, ECU0 determines whether the ignition key position information is from KEY_ACC to KEY_ON;

[0056] Step F24, if the ignition key remains in the KEY_ACC position, the vehicle maintains the current state;

[0057] Step F25, the ignition key position information changes from KEY_ACC to KEY_ON, ECU0 controls the K2 relay to close, and supplies power to ECU_AA and ECU_AB;

[0058] Step F26, ECU_AA and ECU_AB start working;

[0059] Step F27: low-voltage power-up of all electrical systems of the vehicle is completed.

[0060] refer to Figure 4 The embodiment of the present invention also provides a power-off control method of a low-voltage power supply intelligent protection system of a hydrogen-powered vehicle, comprising:

[0061] Step F60: the driver requests the vehicle to power off;

[0062] Step F61, ECU0 determines whether the ignition key is turned from KEY_ON to KEY_OFF;

[0063] Step F62, if the ignition key position changes quickly from KEY_ON to KEY_OFF, ECU0 sequentially completes the actions of KEY_ON to KEY_ACC and KEY_ACC to KEY_OFF;

[0064] Step F63, ECU0 determines whether the ignition key is switched from KEY_ON to KEY_ACC;

[0065] Step F64, if the ignition key is not activated, the vehicle maintains the current state;

[0066] Step F65, if the ignition key is turned from KEY_ON to KEY_ACC, ECU0 controls the K2 relay to be disconnected, so that ECU_AA and ECU_AB are powered off;

[0067] Step F66, ECU0 determines whether the ignition key is switched from KEY_ACC to KEY_OFF;

[0068] Step F67, if the ignition key remains in the KEY_ACC position, the vehicle maintains the current state;

[0069] Step F68, if the ignition key changes from KEY_ACC to KEY_OFF, ECU0 controls K1 relay to disconnect, so that ECU_A and ECU_B are powered off;

[0070] Step F69, if the ignition key is switched from KEY_ACC to KEY_OFF, synchronize ECU_aa and ECU_ba to complete the relevant data storage work before power failure;

[0071] Step F70: After step F69 is executed, ECU_a controls the K3 relay to be disconnected, so that ECU_aa is powered off;

[0072] Step F71: After step F69 is executed, the synchronous self-power-off ECU_ba cuts off its internal power supply, so that ECU_ba is powered off internally;

[0073] Step F72, ECU0, ECU1, ECU_a, ECU_b determine whether they have a sleep condition according to the network management status;

[0074] Step F73, if the vehicle does not meet the sleep condition, ECU0, ECU1, ECU_a, and ECU_b wait for their respective network management NM states until the sleep condition is met;

[0075] Step F74, if the vehicle meets the sleep condition, ECU0, ECU1, ECU_a, ECU_b enter the low power consumption mode; Step F75, during the vehicle's static sleep period, ECU1 determines the low-voltage battery power state, if the low-voltage battery power does not meet the first preset value, then returns to step F74;

[0076] Step F76, if the low-voltage battery power meets the first preset value, that is, S1<low-voltage battery power<S2, ECU1 wakes up ECU0, for example, the low-voltage battery monitoring unit wakes up PEPS via CAN;

[0077] Step F77, ECU0 controls K0 relay to be turned off, so that ECU_a and ECU_b are powered off;

[0078] Step F78: Only the first control systems ECU0 and ECU1 of the vehicle are in low-power sleep mode. At this time, the vehicle enters a deep sleep state, and the power consumption of the entire vehicle during stationary state reaches the minimum.

[0079] In summary, the present invention only adds an emergency start switch and an ordinary relay (for delayed power-off) to the existing components of the vehicle. By implementing a more practical power distribution method for the vehicle's electrical components according to their functional requirements and combining relevant automatic control logic, the static energy consumption of the vehicle is minimized, the entire vehicle is put into a deep sleep state, the low-voltage power supply is protected, the low-voltage battery is prevented from running out of power, the static parking time of the entire vehicle is further extended, the safety of the vehicle during static parking is improved, and the user's vehicle needs and vehicle safety are ensured.

[0080] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0081] In this article, relations or terms such as name ordinal number, first, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusions.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a low-voltage power supply intelligent protection system of a hydrogen-powered vehicle, characterized in that: The method uses a low-voltage power intelligent protection system for a hydrogen-powered vehicle, which includes a low-voltage battery, a low-voltage power management relay, an emergency start switch, a vehicle electronic control system and a low-voltage power supply harness; the vehicle electronic control system includes a first control system, a second control system, a third control system and a fourth control system; the low-voltage power management relay includes a low-voltage power protection relay, an ignition key ACC position relay, an ignition key ON position relay and a delayed power-off relay; the low-voltage power supply harness has five positive main circuit wires and one main circuit negative wire; the low-voltage battery is respectively connected to different low-voltage power management relays and their positive main circuit wires; the vehicle electronic control system is respectively connected to different positive main circuit wires; The first control system is a vehicle safety monitoring electronic control system, which is directly connected to the low-voltage battery through the low-voltage power supply harness; The second control system is a power protection control electronic control system, which is connected to the low-voltage battery through the low-voltage power supply harness and the low-voltage power protection relay respectively; The third control system is an ignition key switch control electronic control system, which is connected to the low-voltage battery through the low-voltage power supply harness, the ignition key ACC position relay or the ignition key ON position relay; The fourth control system is a delayed power-off electric control system, which is connected to the low-voltage battery through the low-voltage power supply harness and the delayed power-off relay, or directly connected to the low-voltage battery through the low-voltage power supply harness; The method includes the following processes: a first control system detects the ignition key position, the emergency start switch, and the low-voltage battery power status information, and controls the closing / opening of the low-voltage power supply protection relay, the ignition key ACC position relay, and the ignition key ON position relay according to the detected status information; the second control system controls the closing / opening of the delayed power-off relay according to the vehicle status, and supplies power to / off the fourth control system; During the period when the vehicle is stationary, when the first control system detects that the power level of the low-voltage battery meets the first preset value, it controls the low-voltage power supply protection relay to be disconnected, so that the second control system is powered off; when the vehicle is ignited and started, when the first control system detects that the power level of the low-voltage battery meets the first preset value, it sends an alarm and prompt information to the instrument; when the vehicle ignition key is turned off, after the fourth control system completes the power-off related functions, the second control system controls the delayed power-off relay to be disconnected, or the fourth control system controls the internal delay relay to be disconnected; the driver presses the emergency start switch according to the instrument prompt information, and the first control system detects that the switch is closed, controls the low-voltage power supply protection relay to be closed, and powers on the second control system; after the emergency start switch is pressed, the vehicle is requested to start within the preset time limit, and the first control system controls to complete the vehicle emergency start requirement, so that the vehicle completes the low-voltage power-on; after the emergency start switch is pressed, if the vehicle is not requested to start within the preset time limit, the first control system controls the low-voltage power supply protection relay to be disconnected.

2. The control method of a low-voltage power supply intelligent protection system for a hydrogen-powered vehicle according to claim 1 is characterized in that: The first control system is connected to the emergency start switch via a signal acquisition wire.

3. The control method of the low-voltage power supply intelligent protection system of a hydrogen-powered vehicle according to claim 1 is characterized in that: The first control system is connected to the low-voltage power supply protection relay, the ignition key ACC position relay, and the ignition key ON position relay through control wires.

4. The control method of a low-voltage power supply intelligent protection system for a hydrogen-powered vehicle according to claim 1 is characterized in that: The second control system is connected to the delayed power-off relay via a control wire.

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