A method for low voltage shielding of a vehicle

Abstract

This invention discloses a method for vehicle low-voltage shielding, belonging to the field of voltage shielding technology, including the following steps: S1 determining the vehicle's power source and determining a low-voltage state; S2 determining whether the conditions for entering the shielding state are met based on the result of step S1 and the current vehicle condition. If met, the vehicle enters the shielding state and continues to step S3; otherwise, step S2 is repeated; S3 determining whether the vehicle meets the conditions for exiting the shielding state based on the current vehicle condition. If met, the vehicle exits the shielding state; otherwise, step S3 continues. This low-voltage shielding strategy reduces the problem of frequent ESC errors caused by low voltage before vehicle startup, improving the driver's experience. Simultaneously, in terms of fault code (DTC) recording, it accurately records the real reasons causing the ESC function to be unusable, facilitating real-vehicle problem troubleshooting. It also provides a design basis for subsequent Electronic Stability Control (ESC) software development.

Description

Technical Field

[0001] This invention belongs to the field of voltage shielding technology, specifically a method for low-voltage shielding of vehicles. Background Technology

[0002] Currently, vehicles have an increasing number of controllers, each of which generates static current, making the battery prone to depletion after the vehicle has been idle for a period of time. This is especially true in winter, when battery depletion is more severe. The ESC (Electronic Stability Control) typically operates at 9V to 16V. A complete battery drain will cause various warning lights to appear on the instrument panel, resulting in a poor user experience. This negative experience only occurs before the engine starts or the vehicle is in the "Ready" state. After the engine starts or the vehicle is in "Ready" state, power is supplied by the alternator or DC-DC converter, and there will be no low voltage issue. Summary of the Invention

[0003] To address the above issues, this invention provides a method for controlling a vehicle's low-voltage shielding state. Different conditions for entering and exiting the shielding state are set for gasoline vehicles and electric vehicles under functional low voltage and network low voltage conditions, respectively. This reduces the problem of frequent ESC errors caused by low voltage before vehicle startup, improving the driver's experience. Simultaneously, in terms of fault code (DTC) recording, the actual reasons causing the ESC function to be unusable are accurately recorded, facilitating troubleshooting in real-vehicle scenarios.

[0004] The technical solution of this invention is as follows: a method for a vehicle in a low-voltage shielding state, comprising the following steps:

[0005] S1: Determine the vehicle's power source and determine the low voltage status;

[0006] S2: Based on the result of step S1 and the current vehicle condition, determine whether the conditions for entering the shielded state are met.

[0007] If the conditions are met, the system enters the shielding state and continues to step S3.

[0008] If it does not meet the requirements, repeat step S2;

[0009] S3: Determine whether the vehicle meets the conditions for exiting the shielded state based on the current vehicle condition.

[0010] If the conditions are met, exit the blocking state.

[0011] If it does not meet the requirements, continue to step S3.

[0012] Furthermore, in step S1, the vehicle's power source is either fuel power or electric power.

[0013] Furthermore, in step S1, the low voltage state is either functional low voltage or network low voltage.

[0014] Furthermore, in step S2, the conditions for entering the shielded state are whether the power supply voltage is less than the set value, whether the vehicle speed is less than the set value, and whether the vehicle is in the set state.

[0015] Furthermore, in step S3, the conditions for exiting the shielding state are whether the power supply voltage is greater than the set value, whether the vehicle speed is greater than or equal to the set value, or whether the vehicle is in the set state.

[0016] Furthermore, the conditions under which a vehicle enters a shielded state due to functional low voltage are:

[0017] The power supply voltage is less than 8.6V, the vehicle speed is less than 4km / h, and the vehicle is not started.

[0018] Furthermore, the conditions under which a vehicle exits the shielded state due to a functional low voltage are:

[0019] The shielding state will exit once any one of the following conditions is met: power supply voltage ≥ 8.6V, vehicle speed ≥ 4km / h, or vehicle starts.

[0020] Furthermore, the conditions under which a vehicle enters a shielded state due to low network voltage are:

[0021] The power supply voltage is less than 9V and does not meet the conditions for recording network signal anomalies (DTCs).

[0022] The power supply voltage recovers from less than 9V to greater than 9.5V, and the duration of being greater than 9.5V is ≤1000ms, and the network signal abnormality DTC recording conditions are not met;

[0023] If any one of the above conditions is met, the device will enter a shielded state.

[0024] Furthermore, the conditions under which a vehicle exits the shielded state due to low network voltage are:

[0025] Condition 1: Supply voltage > 9.5V, and duration > 1000ms;

[0026] Condition 2: The conditions for recording Network Signal Anomaly (DTC) must be met;

[0027] If any of the above conditions are met, the blocking state will be exited.

[0028] Furthermore, starting a gasoline-powered vehicle means the engine is in an idle start-stop or running state, while starting an electric vehicle means the entire vehicle is in a Ready state.

[0029] The beneficial effects of this invention are as follows:

[0030] This invention provides a method for addressing low-voltage shielding in vehicles. By employing a low-voltage shielding strategy, it reduces the problem of frequent ESC errors caused by low voltage before vehicle startup, thus improving the driver's experience. Simultaneously, in terms of fault code (DTC) recording, it accurately records the actual reasons causing the ESC function to malfunction, facilitating troubleshooting in real-world vehicles. Attached Figure Description

[0031] Figure 1 Low-voltage shielding logic diagram for fuel-powered vehicles.

[0032] Figure 2 Low-voltage shielding logic diagram for electric vehicle functions.

[0033] Figure 3 This is a logic diagram for low-voltage shielding in a network. Detailed Implementation

[0034] It should be noted that in the description of this invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; a connection can be a mechanical connection or an electrical connection; a link can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Engine Running: Engine in operation

[0037] ESC: Electronic Stability Control System.

[0038] DCDC: DC to DC, high voltage to low voltage.

[0039] The "Ready" indicator on an electric vehicle's dashboard means that the vehicle is fully prepared, has been successfully started, and is ready to depart. This indicator is generally only found on new energy or hybrid models.

[0040] Functional low voltage: The voltage is below 8.6V (confirmed based on actual vehicle), which reduces the hardware capabilities of ESC.

[0041] Low network voltage: The voltage is below 9V (confirmed based on actual vehicle data), which may cause abnormalities in the messages sent by the vehicle's various controllers.

[0042] DTC: Fault Code. A DTC is recorded when a fault occurs and the duration of the fault exceeds a threshold.

[0043] The purpose of the present invention is achieved through the following technical solutions:

[0044] ESC operation requires both hardware support (valves, motors, etc.) and available vehicle signals acquired over the network. Low voltage can lead to reduced hardware capabilities or abnormal vehicle signals, resulting in an ESC alarm. Therefore, low voltage shielding needs to consider both "functional low voltage" and "network low voltage" separately.

[0045] Methods for entering and exiting shielded state due to functional low voltage:

[0046] For vehicle operation scenarios, "the vehicle is stationary, and the engine of a traditional vehicle is not started or is starting, while the engine of an electric vehicle is not started or is starting."

[0047] In this operating scenario, ESC will not intervene. If the voltage is below 8.6V, low voltage shielding will be implemented, ESC alarm will not be triggered, and the ESC function will remain enabled.

[0048] Conditions for entering and exiting shielded state transition due to low functional voltage:

[0049] Entry conditions

[0050] Condition 1: Power supply voltage < 8.6V (depending on the selected hardware);

[0051] Condition 2: Vehicle speed < 4km / h (judged as the vehicle is stationary and considering the speed threshold for triggering various ESC functions) Condition 3 (applicable to conventional vehicles): The engine is not in idle start-stop mode and the engine is not running

[0052] Condition 4 (applicable to electric vehicles): The vehicle is not in a Ready state.

[0053] If all of the above conditions are met, the system will enter a disabled state while keeping the ESC function enabled.

[0054] Exit conditions

[0055] Condition 1: Power supply voltage ≥ 8.6V (depending on the selected hardware);

[0056] Condition 2: Vehicle speed ≥ 4km / h (judgment based on vehicle stationary state and speed thresholds for ESC function triggering) Condition 3 (applicable to traditional vehicles): Engine in idle start-stop mode

[0057] Condition 4 (applicable to conventional vehicles): Engine is Running

[0058] Condition 5 (applicable to electric vehicles): The vehicle is in a Ready state.

[0059] If any of the above conditions are met, the shielding state will be exited. If the voltage is below 9.5V and the duration exceeds 1000ms, the low voltage DTC recording function will be activated, the ESC function will be disabled, the instrument panel will sound an alarm, and the driver will be alerted.

[0060] Methods for entering and exiting shielded mode due to low network voltage:

[0061] Because vehicle signals received from the network may become abnormal when the vehicle voltage is below 9V (as confirmed by the diagnostic specifications), the vehicle requires all controllers to disable network signal monitoring when the voltage is below 9V (as confirmed by the diagnostic specifications). If ESC disables network signal monitoring, the ESC function will become unusable.

[0062] In reality, some controllers on the vehicle can still work normally when the voltage is below 9V. Therefore, for the working condition of "the voltage is below 9V, but the controllers can still send correct signals", low voltage shielding is performed, network signal monitoring is still enabled, and the ESC function is kept enabled.

[0063] Fault codes are only recorded when an abnormal network signal is detected and the duration exceeds a threshold. In order to clarify the real reason why the ESC function is unavailable, a network low voltage DTC is reported instead of a network signal abnormality DTC, and ESC-related functions are disabled.

[0064] Network low voltage shielding entry and exit state transition conditions:

[0065] Entry conditions

[0066] Condition 1: The supply voltage is less than 9V or the supply voltage recovers from less than 9V to greater than 9.5V, and the duration of the state at greater than 9.5V does not exceed 1000ms;

[0067] Condition 2: The conditions for recording DTC (Disruptive Traceability) signals due to network signal abnormalities are not met;

[0068] The conditions for recording abnormal network signal DTCs vary depending on the vehicle. Generally, if the fault lasts for 100-1000ms, the abnormal DTC needs to be recorded and the fault reported.

[0069] If all of the above conditions are met, the device will enter a shielded state while keeping the ESC function enabled.

[0070] Exit conditions

[0071] Condition 1: Supply voltage > 9.5V and duration > 1000ms;

[0072] Condition 2: Meets the conditions for DTC (Distributed Traffic Control Trace) recording of network signal anomalies.

[0073] If any of the above conditions are met, the blocking state will be exited.

[0074] If both condition 1 and condition 2 are met, record the network signal abnormality DTC and do not report the network low voltage DTC.

[0075] If condition 1 is not met, but condition 2 is met, then no network signal abnormality DTC will be recorded, and a network low voltage DTC will be reported.

[0076] If condition 1 is met and condition 2 is not met, then no network signal abnormality DTC will be recorded and no network low voltage DTC will be reported.

[0077] If neither condition 1 nor condition 2 is met, then no network signal abnormality DTC will be recorded, and no network low voltage DTC will be reported.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be included within the scope of protection of the present invention. Furthermore, all content not described in detail in this specification is prior art known to those skilled in the art.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A method for controlling the low voltage shielding state of a vehicle's ESC, characterized in that, Includes the following steps: S1: Determine the vehicle's power source and determine the low voltage status; S2: Based on the result of step S1 and the current vehicle condition, determine whether the conditions for entering the shielded state are met. If they are met, enter the shielded state and continue to step S3. If they are not met, repeat step S2. S3: Determine whether the vehicle meets the conditions for exiting the shielded state based on the current vehicle condition. If it does, exit the shielded state; otherwise, continue with step S3. The vehicle is powered by fuel, and the low voltage state is either functional low voltage or network low voltage. In step S2, the conditions for entering the shielded state are whether the power supply voltage is less than a set value, whether the vehicle speed is less than a set value, and whether the vehicle is in a set state. The conditions for a vehicle to enter a shielded state due to low functional voltage are: power supply voltage < 8.6V, vehicle speed < 4km / h, engine not in idle start-stop and engine not running; if all of the above conditions are met, the vehicle will enter a shielded state. The conditions for a vehicle to enter a shielded state due to low network voltage are as follows: Condition 1: The power supply voltage is <9V or the power supply voltage recovers from less than 9V to greater than 9.5V, and the duration of being greater than 9.5V is ≤1000ms; Condition 2: And the conditions for recording abnormal network signals (DTC) are not met; If both of the above conditions are met, the vehicle enters a shielded state. In step S3, the exit from the shielding state condition is whether the power supply voltage is greater than a set value, whether the vehicle speed is greater than or equal to a set value, or whether the vehicle is in a set state. The conditions for a vehicle to exit the shielded state due to low functional voltage are: power supply voltage ≥ 8.6V, vehicle speed ≥ 4km / h, engine in idle start-stop mode or engine in running mode; any one of the above conditions will cause the vehicle to exit the shielded state. The conditions for a vehicle to exit the shielded state due to low network voltage are: power supply voltage > 9.5V and duration > 1000ms, and the conditions for recording network signal abnormality DTC are met; the vehicle will exit the shielded state if any one of the above conditions is met.

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