Electronic control systems

Abstract

The present invention provides an electronic control system, comprising an undervoltage identification unit, a power selection unit, a voltage detection unit, a microcontroller unit, and a switch unit. The electronic control system is powered by a first power supply and / or a second power supply. When powered on, if an undervoltage fault occurs in one of the power supplies, the undervoltage identification unit may send a voltage identification signal indicating the undervoltage to the power selection unit, so that the power selection unit controls the switch unit to switch to a normal power supply to avoid the power supply undervoltage fault causing the various units to fail to operate. After power is turned on, the voltage detection unit detects the voltages of the two power supplies so that the microcontroller unit can classify the faults of the two power supplies and output a power adjustment signal according to the fault classification result, so that the power selection unit can control the switch unit according to the power adjustment signal, so that when an overvoltage fault occurs in one of the power supplies, the power supply with a relatively low voltage can supply power.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile electronics, and in particular to an electronic control system. Background Art

[0002] With the development of the automotive industry and automotive electronics technology, higher and higher requirements are being placed on the reliability of electronic control systems. As the core component of automotive electronic control systems, electronic controllers are crucial for ensuring their safe and reliable operation.

[0003] Reliable power supply is a prerequisite for reliable operation of electronic controllers. However, when the power supply network is overloaded or a short circuit occurs in the wiring harness at different locations, the power supply voltage connected to the electronic controller may fail, causing the vehicle power supply voltage to fall below the undervoltage threshold Vunth or exceed the overvoltage threshold Vovth, thereby causing the electronic controller to malfunction. Summary of the Invention

[0004] The object of the present invention is to provide an electronic control system to solve the problem in existing electronic control systems that electronic controllers are prone to malfunction when a power supply fails.

[0005] To solve the above technical problems, the present invention provides an electronic control system, which is powered by a first power supply and / or a second power supply, and includes: a first undervoltage identification unit, a voltage detection unit, a microcontroller unit, a power selection unit, and a switch unit, wherein the switch unit includes a first switch and a second switch;

[0006] The first undervoltage identification unit compares the voltage of the first power source with an undervoltage threshold, and outputs a voltage identification signal to the power selection unit according to the comparison result;

[0007] The voltage detection unit detects the voltage of the first power supply and the voltage of the second power supply and outputs the voltage detection result to the micro control unit;

[0008] The micro control unit performs power supply diagnosis based on the voltage detection result to classify the faults of the first power supply and the second power supply, and outputs a power supply adjustment signal to the power supply selection unit based on the result of the fault classification;

[0009] The power selection unit controls the opening and closing of the first switch and the second switch according to the magnitude of the voltage identification signal output by the first undervoltage identification unit, so that when an undervoltage fault occurs in the first power supply, power is switched to the second power supply; and

[0010] After receiving the power adjustment signal, the power selection unit controls the opening and closing of the first switch and the second switch so that when an overvoltage fault occurs in the first power supply and / or the second power supply, the power can be supplied by the one with a relatively lower voltage between the first power supply and the second power supply.

[0011] Optionally, in the electronic control system, a first power supply control strategy is configured in the power supply selection unit, and the first power supply control strategy is configured according to the size of the voltage identification signal output by the first undervoltage identification unit. After receiving the voltage identification signal output by the first undervoltage identification unit, the power supply selection unit controls the opening and closing of the first switch and the second switch according to the first power supply control strategy.

[0012] Optionally, in the electronic control system, the microcontroller unit includes a fault diagnosis module and a power supply control module, the fault diagnosis module performs power supply diagnosis based on the voltage detection result to fault classify the faults of the first power supply and the second power supply, and outputs the fault classification result to the power supply control module; after receiving the fault classification result, the power supply control module outputs a power adjustment signal to the power supply selection unit.

[0013] Optionally, in the electronic control system, a second power control strategy is configured in the power control module, and the second power control strategy is configured based on the results obtained by the fault classification. After receiving the results of the fault classification, the power control module outputs the power adjustment signal according to the second power control strategy.

[0014] Optionally, in the electronic control system, the electronic control system also includes a power conversion unit, which forms a third power supply based on the first power supply and / or the second power supply, and the third power supply supplies power to the micro control unit, and the voltage of the third power supply is less than the voltage of the first power supply and the voltage of the second power supply.

[0015] Optionally, in the electronic control system, the first undervoltage identification unit includes a first comparator and a first undervoltage threshold circuit, the first undervoltage threshold circuit sets the undervoltage threshold, the first comparator compares the size of the first comparator and the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result.

[0016] Optionally, in the electronic control system, the switch unit further includes an isolation circuit, and the isolation circuit isolates the current between the first power supply and the second power supply.

[0017] Optionally, in the electronic control system, the voltage detection unit includes a first voltage detection module and a second voltage detection module, the first voltage detection module detects the voltage of the first power supply and outputs the voltage detection result to the micro control unit, and the first voltage detection module detects the voltage of the second power supply and outputs the voltage detection result to the micro control unit.

[0018] The present invention also provides another electronic control system, which is powered by a first power supply and / or a second power supply, and is characterized in that the electronic control system includes: a first undervoltage identification unit, a second undervoltage identification unit, a voltage detection unit, a microcontroller unit, a power selection unit, and a switch unit, wherein the switch unit includes a first switch and a second switch;

[0019] The first undervoltage identification unit compares the voltage of the first power source with an undervoltage threshold, and outputs a voltage identification signal to the power selection unit according to the comparison result;

[0020] The second undervoltage identification unit compares the voltage of the second power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit according to the comparison result; the voltage detection unit detects the voltage of the first power supply and the voltage of the second power supply and outputs the voltage detection result to the micro control unit;

[0021] The micro control unit performs power supply diagnosis based on the voltage detection result to classify the faults of the first power supply and the second power supply, and outputs a power supply adjustment signal to the power supply selection unit based on the result of the fault classification;

[0022] The power selection unit controls the opening and closing of the first switch and the second switch according to the magnitude of the voltage identification signal output by the first undervoltage identification unit and / or the magnitude of the voltage identification signal output by the second undervoltage identification unit, so that when an undervoltage fault occurs in the first power supply, power is switched to the second power supply, or when an undervoltage fault occurs in the second power supply, power is switched to the first power supply, or when both the first power supply and the second power supply occur undervoltage faults, neither supplies power; and

[0023] After receiving the power adjustment signal, the power selection unit controls the opening and closing of the first switch and the second switch so that when an overvoltage fault occurs in the first power supply and / or the second power supply, the power can be supplied by the one with a relatively lower voltage between the first power supply and the second power supply.

[0024] Optionally, in the electronic control system, a third power supply control strategy is configured in the power supply selection unit. The third power supply control strategy is configured according to the size of the voltage identification signal output by the first undervoltage identification unit and the size of the voltage identification signal output by the second undervoltage identification unit. After receiving the voltage identification signal output by the first undervoltage identification unit and / or the voltage identification signal output by the second undervoltage identification unit, the power supply selection unit controls the opening and closing of the first switch and the second switch according to the third power supply control strategy.

[0025] Optionally, in the electronic control system, the microcontroller unit includes a fault diagnosis module and a power supply control module, the fault diagnosis module performs power supply diagnosis based on the voltage detection result to fault classify the faults of the first power supply and the second power supply, and outputs the fault classification result to the power supply control module; after receiving the fault classification result, the power supply control module outputs a power adjustment signal to the power supply selection unit.

[0026] Optionally, in the electronic control system, a second power control strategy is configured in the power control module, and the second power control strategy is configured based on the results obtained by the fault classification. After receiving the results of the fault classification, the power control module outputs the power adjustment signal according to the second power control strategy.

[0027] Optionally, in the electronic control system, the electronic control system further includes a power conversion unit, which reduces the voltage of the first power supply and / or the second power supply to power the micro control unit.

[0028] Optionally, in the electronic control system, the first undervoltage identification unit includes a first comparator and a first undervoltage threshold circuit, and the second undervoltage identification unit includes a second comparator and a second undervoltage threshold circuit. The first undervoltage threshold circuit and the second undervoltage threshold circuit respectively set the undervoltage threshold. The first comparator compares the first power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result. The second comparator compares the second power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result. Optionally, in the electronic control system, the switch unit further includes an isolation circuit, which isolates the current between the first power supply and the second power supply.

[0029] Optionally, in the electronic control system, the voltage detection unit includes a first voltage detection module and a second voltage detection module, the first voltage detection module detects the voltage of the first power supply and outputs the voltage detection result to the micro control unit, and the first voltage detection module detects the voltage of the second power supply and outputs the voltage detection result to the micro control unit.

[0030] In the electronic control system provided by the present invention, the electronic control system includes a first undervoltage identification unit, a voltage detection unit, a microcontroller unit, a power selection unit, and a switch unit. The electronic control system of the present invention can be powered by a first power supply and a second power supply. During power-on, if an undervoltage fault occurs in the first power supply, the first undervoltage identification unit can send a voltage identification signal indicating the undervoltage to the power control module, so that the power selection unit controls the switch unit to stop the first power supply and switch to the second power supply. In this way, it is possible to avoid normal power-on failure due to the undervoltage fault of the first power supply. After power-on, the voltage detection unit detects the voltages of the first power supply and the second power supply so that the microcontroller unit can perform fault classification on the first power supply and output a power adjustment signal based on the fault classification result. Then, the power selection unit can control the switch unit based on the power adjustment signal. In this way, when an overvoltage fault occurs in the first power supply and / or the second power supply, the power supply with a relatively lower voltage can still provide power. Compared with the prior art, the electronic control system of the present invention can be connected to a dual power supply and powered by a dual power supply, with the first power supply being the main power supply and the second power supply being the auxiliary power supply. When the first power supply cannot supply power normally, the second power supply is used for power supply. This ensures the reliable operation of the controller power supply, thereby solving the problem that the electronic controller of the prior art electronic control system is prone to failure when the power supply fails. It can also realize the selection of the desired power supply according to application needs and perform flexible switching control.

[0031] In another electronic control system provided by the present invention, the electronic control system includes a first undervoltage identification unit, a second undervoltage identification unit, a voltage detection unit, a microcontroller unit, a power selection unit, and a switch unit. The electronic control system of the present invention can be powered by the first power supply and the second power supply. During power-on, if an undervoltage fault occurs in the first power supply and / or the second power supply, the first undervoltage identification unit and / or the second undervoltage identification unit can send a voltage identification signal indicating the undervoltage to the power control module. The power selection unit controls the switch unit to avoid normal power-on failure due to the undervoltage fault of the first power supply or the second power supply. After power-on, the voltage detection unit detects the voltages of the first power supply and the second power supply so that the microcontroller unit can classify the faults of the first power supply and the second power supply and output a power adjustment signal based on the fault classification result. The power selection unit then controls the switch unit based on the power adjustment signal. In this way, when an overvoltage fault occurs in the first power supply and / or the second power supply, the power supply with a relatively lower voltage can be used for power supply. Compared with the prior art, the electronic control system of the present invention can be connected to a dual power supply and is powered by a dual power supply. The first power supply and the second power supply are not divided into primary and secondary. As long as one power supply is normal, the electronic control system of the present invention can operate normally, which ensures the reliable operation of the controller power supply. Therefore, it solves the problem that the electronic controller of the prior art electronic control system is prone to failure when the power supply fails. It can also realize the selection of the desired power supply according to application needs and perform flexible switching control. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a schematic diagram of the connection relationship of the electronic control system of the first embodiment of the present invention;

[0033] Figure 2 1 is a schematic diagram of a connection relationship between an isolation circuit and a first switch and a second switch according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of fault classification in an embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of a second power control strategy according to an embodiment of the present invention;

[0036] Figure 5 Schematic diagram of the connection relationship of the electronic control system of the second embodiment of the present invention.

[0037] The descriptions of the reference numerals are as follows:

[0038] 11-first undervoltage identification module; 12-voltage detection unit; 13-micro control unit; 14-power selection unit; 121-first voltage detection module; 122-second voltage detection module; 15-switch unit; 151-first switch; 152-second switch; 101-first power supply; 102-second power supply; 153-isolation circuit; 111-first comparator; 112-first undervoltage threshold circuit; 131-fault diagnosis module; 132-power control module; 16-power conversion unit; 17-second undervoltage identification unit; 171-second comparator; 172-second undervoltage threshold circuit. DETAILED DESCRIPTION

[0039] The electronic control system proposed by the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention. Furthermore, the structures shown in the drawings are often portions of actual structures. In particular, different drawings may require different emphases and may employ different scales.

[0040] [Example 1]

[0041] like Figure 1 As shown, this embodiment provides an electronic control system ECU, which includes: a first undervoltage identification unit 11, a voltage detection unit 12, a micro control unit (MCU) 13, a power selection unit 14 and a switch unit 15, and the switch unit 15 includes a first switch 151 and a second switch 152.

[0042] The ECU is powered by a first power supply 101 and / or a second power supply 102. The first power supply 101 is respectively connected to the first undervoltage identification unit 11, the first switch 151 and the voltage detection unit 12. The second power supply 102 is respectively connected to the second switch 152 and the voltage detection unit 12.

[0043] When the first switch 151 is closed and the second switch 152 is open, power is supplied through the first power source 101 ; conversely, when the second switch 152 is closed and the first switch 151 is open, power is supplied through the second power source 102 .

[0044] The switch unit 15 further includes an isolation circuit 153 (illustrated as a diode in the figure), which isolates the current between the first power supply 101 and the second power supply 102 to prevent the currents between the first power supply 101 and the second power supply 102 from interfering with each other. The isolation circuit 153 can be as follows: Figure 1As shown in , there are two of them, which are connected to the first power supply 101 and the second power supply 102 respectively. Figure 2 As shown, there is one isolation circuit 153, which is connected only to the second power supply 102. When there are two isolation circuits 153, a power supply control strategy in which any one or a combination of the first power supply 101 and the second power supply 102 supplies power can be used. When there is only one isolation circuit 153, only some power supply control strategies are applicable. For example, a power supply control strategy in which the first power supply 101 and the second power supply 102 supply power simultaneously and the voltage of the second power supply 102 is greater than the voltage of the first power supply 101 is not applicable. When using this power supply control strategy, it is necessary to avoid the design of this power supply control strategy.

[0045] The first undervoltage identification unit 11 compares the voltage UB1 of the first power supply 101 with the undervoltage threshold and, based on the comparison result, outputs a voltage identification signal to the power selection unit 14. The power selection unit 14 controls the opening and closing of the first switch 151 and the second switch 152 based on the voltage identification signal output by the first undervoltage identification unit 11, so that when an undervoltage fault occurs in the first power supply 101, power is switched to the second power supply 102. To ensure that the microcontroller unit 13 is properly powered on, the power selection unit 14 of this embodiment preferably implements switching via hardware, which is faster than switching via software.

[0046] The first undervoltage identification unit 11 may include a first comparator 111 and a first undervoltage threshold circuit 112. One input of the first comparator 111 is connected to the first power supply 101, the other input of the first comparator 111 is connected to the first undervoltage threshold circuit 112, and the output of the first comparator 111 is connected to the power selection unit 14. The first undervoltage threshold circuit 112 is configured to set the undervoltage threshold. The comparator compares the voltage of the first power supply 101 with the undervoltage threshold and outputs a voltage identification signal to the power control module based on the comparison result. The voltage identification signal may be in the form of a voltage level. For example, if the undervoltage threshold is set to 9V by the first threshold circuit, when the comparator concludes that the voltage of the first power supply is greater than 9V, the comparator outputs a voltage level (indicating no undervoltage, such as a low level) to the power selection unit 14. When the comparator concludes that the voltage of the first power supply is less than or equal to 9V, the comparator outputs an inverse voltage level (indicating undervoltage, such as a high level) to the power selection unit 14. That is, when the signal received by the power selection unit 14 is at a low level, it indicates that the first power supply 101 is not undervoltage (overvoltage or normal), and no power switching is required; when the signal received by the power selection unit 14 is at a high level, it indicates that the first power supply 101 is undervoltage, and it is necessary to switch from the first power supply 101 to the second power supply 102. Here, a high level is used to indicate undervoltage, but it should be understood that when a low level indicates undervoltage and a high level indicates no undervoltage, the power selection unit can also perform power control operations.

[0047] The possible faults of the power supply can be roughly divided into: undervoltage fault and overvoltage fault. In particular, if the power supply has an undervoltage fault, the ECU13 will not be able to power on normally. Therefore, this embodiment directly connects the first undervoltage identification unit 11 to the first power supply 101, so that the undervoltage fault of the first power supply 101 can be detected and the power supply can be switched when power is turned on, so that each unit of the ECU13 can be powered on normally.

[0048] The voltage detection unit 12 detects the voltage of the first power supply 101 and the voltage of the second power supply 102 and outputs the voltage detection result to the MCU 13. Specifically, the voltage detection unit 12 includes a first voltage detection module 121 and a second voltage detection module 122. The first voltage detection module 121 detects the voltage of the first power supply 101 and outputs the voltage detection result to the MCU 13, and the first voltage detection module 122 detects the voltage of the second power supply 102 and outputs the voltage detection result to the MCU 13.

[0049] The MCU 13 performs power diagnosis based on the voltage detection result to classify the faults of the first power supply 101 and the second power supply 102 , and outputs a power adjustment signal to the power selection unit 14 based on the result of the fault classification.

[0050] Specifically, the MCU 13 may include a fault diagnosis module 131 and a power control module 132. The fault diagnosis module 131 performs power diagnosis based on the voltage detection result to classify the faults of the first power supply 101 and the second power supply 102, and outputs the fault classification result to the power control module 132. The power control module 132 outputs a power adjustment signal to the power selection unit 14 based on the fault classification result. More specifically, a second power control strategy is configured within the power control module. The second power control strategy is configured based on the result obtained from the fault classification. After receiving the fault classification result, the power control module outputs the power adjustment signal based on the second power control strategy. The second power control strategy can be configured within the power control module 132 in a machine-readable manner, such as a document.

[0051] The timeliness requirements for overvoltage fault diagnosis are not as high as those for undervoltage fault diagnosis. Therefore, in this embodiment of the present invention, the voltage detection unit 12 is primarily used to detect the voltages of the first power supply 101 and the second power supply 102 to determine whether an overvoltage fault has occurred. The overvoltage fault is then classified in conjunction with the fault diagnosis module 131 so that the power control module 132 can output a reasonable power control strategy to respond to the overvoltage fault. Furthermore, the detection results of the voltage detection unit 12 can also be used to determine whether an undervoltage fault has occurred in the second power supply 102. The undervoltage fault is then classified so that the power control module 132 can output a reasonable power control strategy to respond to the undervoltage fault.

[0052] In addition, the MCU13 can also send the fault classification results to other functional modules of the MCU13, such as the coordination and management functional module (not shown), so that the coordination and management functional module can make other fault responses, such as controlling other units of the MCU13 to reduce energy consumption, etc. Alternatively, the fault classification results can also be output to other ECUs (not shown) through the CAN bus, so that other ECUs can also make corresponding fault responses.

[0053] The power selection unit 14 receives both the voltage identification signal output by the first undervoltage identification unit 11 and the power adjustment signal output by the power control module 132. The response to the voltage identification signal indicating undervoltage output by the first undervoltage identification unit 11 is primarily during power-up, while the response to the power adjustment signal output by the power control module 132 is primarily after power-up.

[0054] The power selection unit 14 is configured with a first power control strategy. The first power control strategy is set based on the magnitude of the voltage identification signal output by the first undervoltage identification unit 11. Therefore, the first power control strategy primarily controls the first power supply 101 and the second power supply 102 during power-on. The first power control strategy can be configured within the power selection unit 14 in a machine-readable manner, such as a document.

[0055] After receiving the voltage identification signal output by the first undervoltage identification unit 11, the power selection unit 14 controls the opening and closing of the first switch 151 and the second switch 152 according to the first power control strategy, so that when an undervoltage fault occurs in the first power supply 101, the second power supply 102 supplies power; and after receiving the power adjustment signal, controls the opening and closing of the first switch 151 and the second switch 152, so that when an overvoltage fault occurs in the first power supply 101 and / or the second power supply 102, a power supply with a relatively low voltage can supply power.

[0056] For the MCU13, low voltage power supply is required in actual application, so the ECU of this embodiment may further include a power conversion unit 16, which is connected to the output end of the isolation circuit 153, and forms a third power supply based on the first power supply 101 and / or the second power supply 102. The third power supply supplies power to the MCU13, and the voltage of the third power supply is lower than the voltage of the first power supply 101 and the voltage of the second power supply 102.

[0057] The following provides examples of the fault classification, the first power control strategy, and the second power control strategy to further illustrate the ECU of this embodiment.

[0058] For ease of description, the undervoltage threshold is defined as Vunth, the overvoltage threshold is defined as Vovth, the first switch 151 is defined as S1, the second switch 152 is defined as S2, the first power supply 101 is defined as UB1, and the second power supply 102 is defined as UB2.

[0059] like Figure 3 As shown in the figure, the possible faults of the power supply can be divided into the following categories:

[0060] (1) Severe undervoltage fault: The power supply voltage is lower than the undervoltage threshold Vunth for a long enough time, longer than t1, but will recover;

[0061] (2) Short-term undervoltage fault: The power supply voltage is lower than the undervoltage threshold Vunth for a certain period of time, which is longer than t2 and shorter than t1;

[0062] (3) Overvoltage fault: The power supply voltage is higher than the overvoltage threshold Vovth for a certain period of time, which is longer than t3, but will recover;

[0063] (4) Severe undervoltage fault: Similar to (1), after the power supply voltage drops below the undervoltage threshold Vunth, the voltage remains low and does not recover;

[0064] (5) Short-term undervoltage fault: The power supply voltage fluctuates at a high frequency, oscillating above and below the undervoltage threshold Vunth. The fluctuation lasts for a certain period of time, t2, which is shorter than t1, equivalent to situation (2);

[0065] In addition, if the fluctuation lasts longer than t1, it is equivalent to the situation (1) and is classified as a serious undervoltage fault.

[0066] (6) Overvoltage fault: Similar to (3), the power supply voltage is higher than the overvoltage threshold Vovth, the high voltage continues, and it does not recover.

[0067] According to actual application conditions, two first power supply control strategies can be defined. The first one is for the case where the initial state is that both S1 and S2 are closed, and the second one is for the case where the initial state is that S1 is closed and S2 is open.

[0068] (1) The first power supply control strategy in the first case

[0069] (1-1) During power-up, UB1 is not undervoltage (normal or overvoltage), and UB2 is normal. Switch S1 is closed, S2 is open, and the ECU is powered by UB1.

[0070] (1-2) During power-up, UB1 is undervoltage and UB2 is normal. The hardware recognizes the UB1 undervoltage and switches S1 open and S2 closed, allowing the ECU to be powered by UB2.

[0071] (1-3) During power-up, UB1 and UB2 are undervoltage. If the voltage on UB1 or UB2 exceeds the operating voltage of the power switching control circuit, the circuit switches to UB2; otherwise, the circuit remains unchanged. First switches 151S1 and S2 cannot be guaranteed to be closed, resulting in a loss of power to the ECU and impaired operation.

[0072] (2) First power supply control strategy in the second case

[0073] (2-1) During power-up, UB1 is not undervoltage (normal or overvoltage), and UB2 is normal or undervoltage. Switch S1 is closed, S2 is open, and the ECU is powered by UB1.

[0074] (2-2) During power-up, UB1 is undervoltage and UB2 is normal. If the UB1 voltage is higher than the operating voltage of the power switching control circuit, UB2 is switched to supply power. Otherwise, the ECU will not be properly powered and will not operate normally.

[0075] (2-3) During power-on, UB1 and UB2 are undervoltage. If the voltages of UB1 and UB2 are higher than the operating voltage of the power switching control circuit, power is switched to UB2. Otherwise, the ECU will not operate.

[0076] It should be noted that for the above two first power supply control strategies, in engineering applications, it is acceptable that both power supplies are undervoltage and the controller does not operate normally.

[0077] like Figure 4 As shown, according to the possible power failure, the second power control strategy can be defined as follows:

[0078] (3-1) UB1 and UB2 are normal. Switch S1 is closed and S2 is open. The ECU is powered by the main power supply UB1.

[0079] (3-2) UB1 is normal, UB2 is faulty. Switch S1 is closed, S2 is open, and the ECU is powered by the main UB1. A UB2 fault (a short-term undervoltage fault, a severe undervoltage fault, or an overvoltage fault) is reported. If UB2 is a severe undervoltage fault or an overvoltage fault, the UB2 fault is not repaired in this driving cycle. S1 remains closed, S2 is open, and power is supplied by UB1. If UB2 is a short-term undervoltage fault, the fault is repaired in this driving cycle. When the UB2 voltage returns to the normal voltage range, the fault is recorded as a historical fault, and the current status returns to normal. Control returns to (3-1).

[0080] (3-3) UB1 Fault, UB2 Fault. In the event of UB1 undervoltage fault, S1 opens, S2 closes, and power is supplied from UB2. In the event of UB1 overvoltage fault or UB2 overvoltage fault, the voltages of UB1 and UB2 are determined, and the lower voltage power supply is selected. In the event of UB1 overvoltage fault or UB2 undervoltage fault, power is supplied from UB1, and a UB1 / UB2 fault is reported. The emergency power-off procedure for dual power supply failure is executed, or limited functional operation is performed.

[0081] (3-4) UB1 fault, UB2 normal. If UB1 is undervoltage, the hardware automatically switches, S1 opens, S2 closes, and UB2 supplies power. If UB1 is overvoltage, S1 opens, S2 closes, and UB2 supplies power. A UB1 fault is reported. If UB1 is a severe undervoltage or overvoltage fault, the UB1 fault is not repaired in this driving cycle. S2 remains closed, S1 opens, and UB2 supplies power. If UB1 is a short-term undervoltage fault, the fault can be repaired in this driving cycle. When the UB1 voltage returns to the normal voltage range, the fault is recorded as a historical fault, the current state returns to normal, and the MCU software controls switch S1 to close and S2 to open, supplying power to UB1. Control switches to (3-1).

[0082] (3-5) UB1 Fault, UB2 Fault. In the event of UB1 overvoltage fault or UB2 overvoltage fault, the software determines the voltage of UB1 and UB2 and selects the lower voltage power supply. In the event of UB1 overvoltage fault or UB2 undervoltage fault, the MCU software switches to UB1 power supply, reports a UB1 or UB2 fault, executes the dual power supply fault emergency power-off procedure, or operates with limited functions.

[0083] [Example 2]

[0084] like Figure 5 As shown, the ECU of this embodiment includes: a first undervoltage identification unit 11, a second undervoltage identification unit 17, a voltage detection unit 12, a micro control unit (MCU) 13, a power selection unit 14 and a switch unit 15, and the switch unit 15 includes a first switch 151 and a second switch 152.

[0085] In addition, the ECU further includes a power conversion unit 14 , the MCU 13 further includes a fault diagnosis module 131 and a power control module 132 , and the switch unit 15 further includes an isolation circuit 153 .

[0086] In this embodiment, the first undervoltage identification unit 11, the voltage detection unit 12, the power conversion unit 14, the fault diagnosis module 131, the power control module 132 and the switch unit 15 are the same as those in Example 1. The description of the first undervoltage identification unit 11, the voltage detection unit 12, the power conversion unit 14, the fault diagnosis module 131, the power control module 132 and the switch unit 15 can be referred to Example 1 and will not be repeated here.

[0087] Unlike the first embodiment, the ECU of this embodiment further includes a second undervoltage identification unit 17, which compares the voltage of the second power supply 102 with the undervoltage threshold and outputs a voltage identification signal to the power supply selection unit 14 based on the comparison result. Specifically, the second undervoltage identification unit 17 includes a second comparator 171 and a second undervoltage threshold circuit 172. One input of the second comparator 171 is connected to the second power supply 102, the other input of the second comparator 171 is connected to the second undervoltage threshold circuit 172, and the output of the second comparator 171 is connected to the power supply selection unit 14. The second undervoltage threshold circuit 172 is used to set the undervoltage threshold, and the second comparator 171 is used to compare the voltage of the second power supply 102 with the undervoltage threshold and output a voltage identification signal to the power supply selection unit 14 based on the comparison result. Similarly, the voltage identification signal output by the second comparator 171 can also be expressed in the form of a level, with low and high levels, that is, the level of the voltage identification signal, indicating whether undervoltage is present or not.

[0088] In addition, different from Example 1, the power selection unit 14 controls the opening and closing of the first switch 151 and the second switch 152 according to the size of the voltage identification signal output by the first undervoltage identification unit 11 and / or the size of the voltage identification signal output by the second undervoltage identification unit 17, so that when the first power supply 101 has an undervoltage fault, it switches to being powered by the second power supply 102, or when the second power supply 102 has an undervoltage fault, it switches to being powered by the first power supply 101, or when both the first power supply 101 and the second power supply 102 have an undervoltage fault, neither of them supplies power.

[0089] Correspondingly, the power selection unit 14 of this embodiment is configured with a third power control strategy. This third power control strategy is configured based on the magnitude of the voltage identification signal output by the first undervoltage identification unit 11 and the magnitude of the voltage identification signal output by the second undervoltage identification unit 17. Upon receiving the voltage identification signal from the first undervoltage identification unit 11 and / or the voltage identification signal output by the second undervoltage identification unit 17, the power selection unit 14 controls the opening and closing of the first switch 151 and the second switch 152 according to the third power control strategy. The third power control strategy can be configured within the power selection unit 14 in a machine-readable manner, such as a document.

[0090] In this embodiment, the third power supply control strategy will not be further illustrated. However, it should be understood that the ECU of this embodiment, compared to the first embodiment, incorporates an undervoltage identification unit that can simultaneously identify undervoltage faults in both UB1 and UB2 and perform corresponding switching. This power supply control strategy is more flexible in application and is not affected by the primary or secondary power supply. By varying the configuration of the power supply selection unit 14, it can easily accommodate applications with both a primary and a secondary power supply.

[0091] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0092] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An electronic control system, wherein the electronic control system is powered by a first power supply and / or a second power supply, wherein: The electronic control system includes: a first undervoltage identification unit, a voltage detection unit, a micro control unit, a power selection unit and a switch unit, wherein the switch unit includes a first switch and a second switch; The first undervoltage identification unit compares the voltage of the first power source with an undervoltage threshold, and outputs a voltage identification signal to the power selection unit according to the comparison result; The voltage detection unit detects the voltage of the first power supply and the voltage of the second power supply and outputs the voltage detection result to the micro control unit; The micro control unit performs power supply diagnosis based on the voltage detection result to classify the faults of the first power supply and the second power supply, and outputs a power supply adjustment signal to the power supply selection unit based on the result of the fault classification; During power-on, the power selection unit controls the opening and closing of the first switch and the second switch according to the magnitude of the voltage identification signal output by the first undervoltage identification unit, so that when an undervoltage fault occurs in the first power supply, power is switched to the second power supply; and After power-on, the power selection unit controls the opening and closing of the first switch and the second switch after receiving the power adjustment signal, so that when both the first power supply and the second power supply have an overvoltage fault, the one with a relatively lower voltage among the first power supply and the second power supply can be used for power supply, and when one of the first power supply and the second power supply has an overvoltage fault, it is determined whether the first power supply or the second power supply is used for power supply according to the status of the other power supply.

2. The electronic control system according to claim 1, wherein: The power selection unit is configured with a first power control strategy, which is configured based on the magnitude of the voltage identification signal output by the first undervoltage identification unit. After receiving the voltage identification signal output by the first undervoltage identification unit, the power selection unit controls the opening and closing of the first switch and the second switch according to the first power control strategy.

3. The electronic control system according to claim 1, wherein: The microcontrol unit includes a fault diagnosis module and a power control module, wherein the fault diagnosis module performs power diagnosis based on the voltage detection result to classify the faults of the first power supply and the second power supply, and outputs the fault classification result to the power control module; The power control module outputs a power adjustment signal to the power selection unit after receiving the fault classification result.

4. The electronic control system according to claim 3, characterized in that: The power control module is configured with a second power control strategy, which is configured based on the results obtained from the fault classification. After receiving the results of the fault classification, the power control module outputs the power adjustment signal according to the second power control strategy.

5. The electronic control system according to claim 1, wherein: The electronic control system also includes a power conversion unit, which forms a third power supply based on the first power supply and / or the second power supply. The third power supply supplies power to the micro control unit, and the voltage of the third power supply is lower than the voltage of the first power supply and the voltage of the second power supply.

6. The electronic control system according to claim 1, wherein: The first undervoltage identification unit includes a first comparator and a first undervoltage threshold circuit. The first undervoltage threshold circuit sets the undervoltage threshold. The first comparator compares the first comparator value with the undervoltage threshold value and outputs a voltage identification signal to the power selection unit based on the comparison result.

7. The electronic control system according to claim 1, wherein: The switch unit further includes an isolation circuit, which isolates the current between the first power supply and the second power supply.

8. The electronic control system according to claim 1, wherein: The voltage detection unit includes a first voltage detection module and a second voltage detection module. The first voltage detection module detects the voltage of the first power supply and outputs the voltage detection result to the micro control unit. The first voltage detection module detects the voltage of the second power supply and outputs the voltage detection result to the micro control unit.

9. An electronic control system, characterized in that: The electronic control system is powered by a first power supply and / or a second power supply, and is characterized in that the electronic control system includes: a first undervoltage identification unit, a second undervoltage identification unit, a voltage detection unit, a micro control unit, a power selection unit, and a switch unit, wherein the switch unit includes a first switch and a second switch; The first undervoltage identification unit compares the voltage of the first power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result; the second undervoltage identification unit compares the voltage of the second power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result; the voltage detection unit detects the voltage of the first power supply and the voltage of the second power supply and outputs the voltage detection result to the micro control unit; The micro control unit performs power supply diagnosis based on the voltage detection result to classify the faults of the first power supply and the second power supply, and outputs a power supply adjustment signal to the power supply selection unit based on the result of the fault classification; During power-on, the power selection unit controls the opening and closing of the first switch and the second switch according to the magnitude of the voltage identification signal output by the first undervoltage identification unit and / or the magnitude of the voltage identification signal output by the second undervoltage identification unit, so that when an undervoltage fault occurs in the first power supply, power is switched to the second power supply, or when an undervoltage fault occurs in the second power supply, power is switched to the first power supply, or when both the first power supply and the second power supply occur an undervoltage fault, neither supplies power; and After power-on, the power selection unit controls the opening and closing of the first switch and the second switch after receiving the power adjustment signal, so that when both the first power supply and the second power supply have an overvoltage fault, the one with a relatively lower voltage among the first power supply and the second power supply can be used for power supply, and when one of the first power supply and the second power supply has an overvoltage fault, it is determined whether the first power supply or the second power supply is used for power supply according to the status of the other power supply.

10. The electronic control system according to claim 9, characterized in that: The power selection unit is configured with a third power control strategy, which is configured based on the magnitude of the voltage identification signal output by the first under-voltage identification unit and the magnitude of the voltage identification signal output by the second under-voltage identification unit. After receiving the voltage identification signal output by the first under-voltage identification unit and / or the voltage identification signal output by the second under-voltage identification unit, the power selection unit controls the opening and closing of the first switch and the second switch according to the third power control strategy.

11. The electronic control system according to claim 9, wherein: The microcontrol unit includes a fault diagnosis module and a power control module, wherein the fault diagnosis module performs power diagnosis based on the voltage detection result to classify the faults of the first power supply and the second power supply, and outputs the fault classification result to the power control module; The power control module outputs a power adjustment signal to the power selection unit after receiving the fault classification result.

12. The electronic control system according to claim 11, wherein: The power control module is configured with a second power control strategy, which is configured based on the results obtained from the fault classification. After receiving the results of the fault classification, the power control module outputs the power adjustment signal according to the second power control strategy.

13. The electronic control system according to claim 9, wherein: The electronic control system also includes a power conversion unit, which forms a third power supply based on the first power supply and / or the second power supply. The third power supply supplies power to the micro control unit, and the voltage of the third power supply is lower than the voltage of the first power supply and the voltage of the second power supply.

14. The electronic control system according to claim 9, wherein: The first undervoltage identification unit includes a first comparator and a first undervoltage threshold circuit, and the second undervoltage identification unit includes a second comparator and a second undervoltage threshold circuit. The first undervoltage threshold circuit and the second undervoltage threshold respectively set the undervoltage threshold. The first comparator compares the first power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result. The second comparator compares the second power supply with the undervoltage threshold and outputs a voltage identification signal to the power selection unit based on the comparison result.

15. The electronic control system according to claim 9, wherein: The switch unit further includes an isolation circuit, which isolates the current between the first power supply and the second power supply.

16. The electronic control system according to claim 9, wherein: The voltage detection unit includes a first voltage detection module and a second voltage detection module. The first voltage detection module detects the voltage of the first power supply and outputs the voltage detection result to the micro control unit. The first voltage detection module detects the voltage of the second power supply and outputs the voltage detection result to the micro control unit.

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