Vehicle accumulator monitoring method and system

[0031] Embodiment: A car battery monitoring system of this embodiment, such as figure 1 As shown, it includes a controller 1, a current and voltage detection module 2, an in-position detector 3, a parking brake detector 4, a liquid level sensor 5, a density sensor 6, a level sensor 7, a distilled water valve 8 and an electrolyte valve 9. The controllers are respectively connected to the position detector, the current and voltage detection module, the parking brake detector, the liquid level sensor, the density sensor, the level sensor, the distilled water valve, the electrolyte valve, the engine controller 11 and the central control lock 12. The current and voltage detection module is connected to the positive electrode and the negative electrode of the battery 10. Both the distilled water valve and the electrolyte valve are electronically controlled valves. The liquid level sensor and density sensor are installed inside the battery, the parking brake detector is connected to the parking brake of the car, the distilled water storage tank is connected to the inside of the battery through a distilled water valve, and the electrolyte storage tank is connected to the inside of the battery through the electrolyte valve.

[0032] The car battery monitoring method of this embodiment is as follows figure 2 As shown, specifically: A. After the engine is stopped, if the remote control lock signal is not received within 20 seconds, then go to step B, if the remote control lock signal is received, then go to step C;

[0033] B. 10 seconds after receiving the remote control lock signal, detect the self-discharge current of the battery, if the self-discharge current is greater than the current threshold, send the self-discharge message to the driver wirelessly;

[0034] C. Detect the battery voltage, if the battery voltage is less than the lower voltage limit, go to step D, if the battery voltage is greater than or equal to the lower voltage limit, the process ends;

[0035] D. The presence detector detects whether the driver is in the car. If the driver is in the car, the power loss warning light flashes to warn. If the driver is not in the car, the power loss message is sent to the driver wirelessly.

[0036] After the process of step C ends, if the parking brake is in the pulled state, the liquid level sensor is activated. When the liquid level sensor detects that the electrolyte level in the battery is lower than the standard level, the density sensor is activated. When the density sensor detects When the electrolyte density is greater than the upper limit of density, open the distilled water valve until the electrolyte level in the battery reaches the standard level; if the density sensor detects that the electrolyte density is less than the upper limit of density, open the electrolyte valve until the electrolyte in the battery The level reaches the standard level.

[0037] There are at least three level sensors, and all level sensors are not on the same straight line. When all level sensors detect that the electrolyte level in the battery is lower than the standard level, the density sensor is activated.

[0038] When the distilled water valve is opened, a liquid level sensor detects that the electrolyte level reaches the standard level and closes the distilled water valve; when the electrolyte valve is opened, all liquid level sensors detect that the electrolyte level reaches the standard level and then close Electrolyte valve.

[0039] When the level sensor detects that the inclination of the vehicle body is less than the threshold, the liquid level sensor is activated for detection; when the level sensor detects that the inclination of the vehicle body is greater than or equal to the threshold, the liquid level sensor is not activated. The threshold can generally be set to an inclination angle of 2°.

[0040] The level sensor may be faulty. To prevent the faulty level sensor from providing incorrect detection information, check whether the level sensor is normal by the following methods:

[0041] S1. When the car is driving, turn on all the liquid level sensors and turn them off after 10 minutes;

[0042] S2. If all the liquid level sensors detect the liquid level, clear the record, and repeat step S1 after 72 hours to 168 hours, if at least one liquid level sensor does not detect the liquid level, go to step S3;

[0043] S3. Record the liquid level sensor that has not detected the liquid level. If the record number of the liquid level sensor reaches 5 times, the liquid level sensor will be marked as abnormal and not used to determine whether the electrolyte level is in the standard liquid If the number of liquid level sensors marked as abnormal reaches 20% of the total number, an abnormal warning of the level sensor will be issued; if the number of liquid level sensors marked as abnormal is less than 20% of the total number, the interval After 24 hours, proceed to step S1; if the number of recordings without a liquid level sensor reaches 5, then proceed to step S1 after an interval of 24 hours.