Vehicle control system

Abstract

The invention discloses a vehicle control system. The vehicle control system comprises a first ECU, a second ECU and a controller, wherein the working voltage of the first ECU is a first voltage; the output voltage of the low-voltage storage battery is a second voltage, and the second voltage is lower than the first voltage; the second ECU is connected with the low-voltage storage battery, and the working voltage of the second ECU is second voltage; the voltage converter is connected between the first ECU and the low-voltage storage battery and used for boosting the output voltage of the low-voltage storage battery; wherein when the boosting time of the voltage converter is greater than a time threshold value, the first ECU and the second ECU start to communicate with each other. According to the vehicle control system, the output voltage of the low-voltage storage battery can be increased, so that the temperature control box ECU can work normally.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular to a vehicle control system. Background Art

[0002] A hybrid vehicle is known in which a low-voltage battery is generally used to power various on-board ECUs. At this time, the output voltage of the low-voltage battery is equal to the operating voltage of the various on-board ECUs (for example, refer to Japanese patent JP2021054164A).

[0003] However, when the system is switched, for example, when the power system of a small car is used in conjunction with the high-voltage battery temperature control system of a medium or large car, the output voltage of the low-voltage battery of the small car is lower than the operating voltage of the temperature control box ECU of the medium or large car, causing the temperature control box ECU to fail to work, which in turn causes errors when other on-board ECUs communicate with the temperature control box ECU. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a vehicle control system to solve the technical problem that the output voltage of the low-voltage battery of a small car is lower than the working voltage of the temperature control box ECU of a medium or large car, causing the temperature control box ECU to fail to work.

[0005] To achieve the above object, an embodiment of the present invention provides a vehicle control system, including:

[0006] A first ECU, wherein an operating voltage of the first ECU is a first voltage;

[0007] a low-voltage battery, wherein the output voltage of the low-voltage battery is a second voltage, and the second voltage is lower than the first voltage;

[0008] A second ECU connected to the low-voltage battery, wherein an operating voltage of the second ECU is a second voltage;

[0009] a voltage converter, connected between the first ECU and the low-voltage battery, for boosting an output voltage of the low-voltage battery;

[0010] When the voltage boost time of the voltage converter is greater than a time threshold, the first ECU and the second ECU start communicating.

[0011] Optionally, when the voltage converter increases the output voltage of the low-voltage battery from the second voltage to the first voltage, the voltage converter sends a communication preparation instruction to the first ECU.

[0012] Optionally, the time threshold is determined according to the output voltage of the low-voltage battery, the ambient temperature of the low-voltage battery and the type of the low-voltage battery.

[0013] Optionally, the method for determining the time threshold includes:

[0014] Detecting the output voltage of the low-voltage battery;

[0015] Using the voltage converter to boost the low-voltage battery, and recording the time required for the output voltage of the low-voltage battery to rise to the first voltage under different ambient temperatures;

[0016] The current ambient temperature is detected, and the time required for the output voltage of the low-voltage battery to rise to the first voltage under the current ambient temperature is determined, thereby determining the time threshold.

[0017] Optionally, the first voltage is 18-80V, and the second voltage is 8-16V.

[0018] Optionally, the second ECU is a vehicle ECU and / or a battery ECU.

[0019] Optionally, the first ECU is a temperature control box ECU, and the temperature control box ECU is used to control the temperature of the high-voltage battery.

[0020] Optionally, the output voltage of the high-voltage battery is 300-1000V.

[0021] Optionally, the auxiliary machines controlled by the temperature control box ECU include: a high-voltage DCDC converter, a temperature sensor, a compressor low-voltage component, and a module board relay.

[0022] Optionally, the vehicle has a fuel cell.

[0023] In the embodiment of the present invention, a voltage converter is arranged between the low-voltage battery and the first ECU, and the output voltage of the low-voltage battery is boosted by the voltage converter. When the boost time of the voltage converter is greater than the time threshold, the voltage converter boosts the output voltage of the low-voltage battery to the first voltage, so that the first ECU can work normally, and thus the first ECU starts to communicate with the second ECU.

[0024] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic structural diagram of a vehicle control system according to an embodiment of the present invention;

[0027] Figure 2 is a timing diagram of a voltage boosting process according to an embodiment of the present invention.

[0028] The reference numerals are as follows:

[0029] 11- first ECU;

[0030] 12- Second ECU;

[0031] 13- low voltage battery;

[0032] 14- Voltage converter. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] Figure 1 Schematic diagram of the structure of a vehicle control system according to an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a vehicle control system, which includes a first ECU 11, a low-voltage battery 13, a second ECU 12 and a voltage converter 14; wherein, the working voltage of the first ECU 11 is a first voltage, the output voltage of the low-voltage battery 13 is a second voltage, and the second voltage is lower than the first voltage; the second ECU 12 is connected to the low-voltage battery 13, and the working voltage of the second ECU 12 is the second voltage; the voltage converter 14 is connected between the first ECU 11 and the low-voltage battery 13, and boosts the output voltage of the low-voltage battery 13; and when the boost time of the voltage converter 14 is greater than the time threshold, the first ECU 11 and the second ECU 12 start communicating.

[0035] Since the output voltage of the low-voltage battery 13 is lower than the working voltage of the first ECU 11, the first ECU cannot work. In the embodiment of the present invention, a voltage converter 14 is provided between the low-voltage battery 13 and the first ECU 11, and the output voltage of the low-voltage battery 13 is boosted by the voltage converter 14. When the boost time of the voltage converter 14 is greater than the time threshold, the voltage converter 14 boosts the output voltage of the low-voltage battery 13 to the first voltage, so that the first ECU 11 can work normally, and thus the first ECU 11 starts to communicate with the second ECU 12.

[0036] It can be seen that even if the output voltage of the low-voltage battery 13 is lower than the operating voltage of the first ECU 11 , the embodiment of the present invention boosts the output voltage of the low-voltage battery 13 through the voltage converter 14 so that the second ECU 12 can communicate smoothly with the first ECU 11 .

[0037] like Figure 2 As shown, if the operating voltage of the first ECU is 24V and the output voltage of the low-voltage battery is 12V, the voltage converter will gradually increase the output voltage of the low-voltage battery from 12V to 24V. When the output voltage of the low-voltage battery rises to 24V, the first ECU can work normally, so the first ECU starts to communicate with the second ECU.

[0038] Optionally, when the voltage converter 14 increases the output voltage of the low-voltage battery 13 from the second voltage to the first voltage, the voltage converter 14 sends a communication preparation instruction to the first ECU 11, which is used to indicate that the first ECU 11 can start communicating with the second ECU 12. The purpose is to ensure that the voltage of the first ECU 11 has reached the first voltage when communicating, thereby ensuring the communication quality.

[0039] In an embodiment of the present invention, the time threshold is determined according to the output voltage of the low-voltage battery 13, the ambient temperature of the low-voltage battery 13, and the type of the low-voltage battery 13. In other words, the output voltage of the low-voltage battery 13, the ambient temperature of the low-voltage battery 13, and the type of the low-voltage battery 13 jointly determine the size of the time threshold.

[0040] Optionally, the method for determining the time threshold includes: detecting the output voltage of the low-voltage battery; boosting the low-voltage battery with a voltage converter, and recording the time required for the output voltage of the low-voltage battery to rise to a first voltage at different ambient temperatures; detecting the current ambient temperature, determining the time required for the output voltage of the low-voltage battery to rise to the first voltage at the current ambient temperature, thereby determining the time threshold. Specifically, first detect the output voltage of a certain type of low-voltage battery, then place the low-voltage battery at different ambient temperatures, boost the low-voltage battery with a voltage converter, and record the time required for the output voltage of the low-voltage battery to rise to the first voltage at different ambient temperatures; in the actual boosting process, detect the current ambient temperature, determine the time required for the output voltage of the low-voltage battery to rise to the first voltage at the current ambient temperature, and add a certain time (such as 0-100 milliseconds) to this time, which is used as the time threshold.

[0041] Optionally, the second ECU 12 is a vehicle ECU and / or a battery ECU. Optionally, the first ECU 11 is a temperature control box ECU, which is used to control the temperature of the high-voltage battery. Optionally, the auxiliary machines controlled by the temperature control box ECU include: a high-voltage DCDC converter, a temperature sensor, a compressor low-voltage part, and a module board relay. The temperature control box ECU controls the auxiliary machines such as the high-voltage DCDC converter, the temperature sensor, the compressor low-voltage part, and the module board relay so that the temperature of the high-voltage battery is within a suitable range to avoid the high-voltage battery temperature being too high or too low.

[0042] Optionally, the output voltage of the low-voltage battery 13 is 8-16V, and the first voltage is 18-80V, that is, the second voltage is 8-16V. Optionally, the output voltage of the high-voltage battery is 300-1000V. In the embodiment of the present invention, a voltage converter 14 is provided between the low-voltage battery 13 and the first ECU 11, and the output voltage of the low-voltage battery 13 is boosted by the voltage converter 14, and the output voltage of the low-voltage battery is increased from 8-16V to 18-80V, so that the temperature control box ECU can work normally.

[0043] Optionally, the vehicle has a fuel cell, and the fuel cell and the high-voltage battery are used to supply electric power to loads including an electric motor and auxiliary machines including an air conditioner, a hydrogen pump, a coolant pump, and a coolant heater.

[0044] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle control system, characterized in that: include: A first ECU, wherein an operating voltage of the first ECU is a first voltage; a low-voltage battery, wherein the output voltage of the low-voltage battery is a second voltage, and the second voltage is lower than the first voltage; a second ECU connected to the low-voltage battery, wherein an operating voltage of the second ECU is the second voltage; a voltage converter, connected between the first ECU and the low-voltage battery, for boosting an output voltage of the low-voltage battery; When the voltage boost time of the voltage converter is greater than a time threshold, the first ECU and the second ECU start communicating.

2. The vehicle control system according to claim 1, characterized in that: When the voltage converter increases the output voltage of the low-voltage battery from the second voltage to the first voltage, the voltage converter sends a communication preparation instruction to the first ECU.

3. The vehicle control system according to claim 1, characterized in that: The time threshold is determined according to the output voltage of the low-voltage battery, the ambient temperature of the low-voltage battery, and the type of the low-voltage battery.

4. The vehicle control system according to claim 3, characterized in that: The method for determining the time threshold comprises: Detecting the output voltage of the low-voltage battery; Using the voltage converter to boost the low-voltage battery, and recording the time required for the output voltage of the low-voltage battery to rise to the first voltage under different ambient temperatures; The current ambient temperature is detected, and the time required for the output voltage of the low-voltage battery to rise to the first voltage under the current ambient temperature is determined, thereby determining the time threshold.

5. The vehicle control system according to claim 1, characterized in that: The first voltage is 18-80V, and the second voltage is 8-16V.

6. The vehicle control system according to claim 1, characterized in that: The second ECU is a vehicle ECU and / or a battery ECU.

7. The vehicle control system according to claim 1, characterized in that: The first ECU is a temperature control box ECU, and the temperature control box ECU is used to control the temperature of the high-voltage battery.

8. The vehicle control system according to claim 7, characterized in that: The output voltage of the high-voltage battery is 300-1000V.

9. The vehicle control system according to claim 7, characterized in that: The auxiliary machines controlled by the temperature control box ECU include: a high-voltage DCDC converter, a temperature sensor, a compressor low-voltage component, and a module board relay.

10. The vehicle control system according to claim 1, characterized in that: The vehicle has a fuel cell.

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