CN109774459B - Method and device for alarming abnormality of automobile fuel quantity - Google Patents
Method and device for alarming abnormality of automobile fuel quantity Download PDFInfo
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- CN109774459B CN109774459B CN201910092389.XA CN201910092389A CN109774459B CN 109774459 B CN109774459 B CN 109774459B CN 201910092389 A CN201910092389 A CN 201910092389A CN 109774459 B CN109774459 B CN 109774459B
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Abstract
The invention discloses an alarm method and device for abnormal automobile fuel quantity, wherein the method comprises the following steps: step 1, judging whether the fuel quantity of a vehicle is abnormal or not; step 2, detecting the current ignition state of the vehicle; step 3, detecting whether the fuel oil tank is switched or not when the ignition is turned on; and 4, alarming for abnormal fuel quantity, comprising the following steps: step 41, when the ignition is turned off, periodically detecting the fuel quantity of the vehicle, and entering the step 1; under the condition of abnormal fuel quantity, sending abnormal fuel quantity alarm information, carrying out fuel alarm voice broadcast and sending abnormal fuel quantity messages to a client terminal through a vehicle bus; and 42, under the conditions of abnormal fuel quantity, ignition on and no detection of switching of the fuel tank, sending abnormal fuel quantity alarm information, carrying out fuel alarm voice broadcast and sending the abnormal fuel quantity message to the client terminal through the vehicle bus. The invention can effectively remind the user of the abnormal condition of the vehicle fuel quantity and reduce the probability of vehicle fuel oil theft.
Description
Technical Field
The invention relates to a method for alarming abnormal working of a vehicle, in particular to a method and a device for alarming abnormal fuel quantity of an automobile.
Background
Along with the development of new automobile models and super trucks of companies, the automobile intelligent degree is higher and higher, the phenomenon that fuel fed back in the market is stolen is solved through an intelligent means, the corresponding strategy that fuel quantity is abnormal through instrument detection is vital, and the abnormal fuel quantity phenomenon needs to be solved urgently.
It is therefore desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The object of the present invention is to provide a method and a device for alarming abnormality of fuel amount of a vehicle, which overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
In order to achieve the aim, the invention provides an automobile fuel quantity abnormity warning method, which comprises the following steps: step 1, judging whether the fuel quantity of a vehicle is abnormal: the vehicle fuel quantity comprises front fuel quantity information and rear fuel quantity information, and the fuel quantity is judged to be abnormal when the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than a first alarm value; step 2, detecting the current ignition state of the vehicle; step 3, detecting whether the fuel oil tank is switched or not under the condition that the ignition on state is judged in the step 2; and 4, alarming for abnormal fuel quantity, which specifically comprises the following steps: step 41, under the condition that the vehicle is judged to be in the off state in the step 2, periodically detecting the fuel quantity of the vehicle, and entering the step 1, wherein the post-fuel quantity information is the percentage value of the currently detected fuel quantity, and the pre-fuel quantity information is the percentage value of the fuel quantity recorded and stored when the key ignition state is in the off state; under the condition that the fuel quantity is judged to be abnormal in the step 1, sending abnormal fuel quantity alarm information, carrying out fuel alarm voice broadcast and sending abnormal fuel quantity messages to a client terminal through a vehicle bus; and 42, under the conditions that the fuel quantity is judged to be abnormal in the step 1, the ignition on state is judged in the step 2, and the fuel tank is not detected to be switched in the step 3, sending out fuel quantity abnormal alarm information, carrying out fuel alarm voice broadcast and sending a fuel quantity abnormal message to a client terminal through a vehicle bus.
Further, the period of "periodically detecting the vehicle fuel amount" of step 41 includes: a self-awakening period and a sleeping period, wherein the self-awakening period is less than the sleeping period, and the step 1 is entered in the self-awakening period.
Further, the self-wake-up period is set to 3s, and the sleep period is set to 180 s.
Further, the method for alarming abnormality of the fuel quantity of the automobile further comprises the following steps: step 5, detecting the current vehicle speed under the condition that the ignition is in the on state in the step 2; step 6, updating and storing the current fuel quantity information as the pre-fuel quantity information under the conditions that the fuel quantity is judged to be abnormal in the step 1, the ignition on state is judged in the step 2, the fuel tank is judged to be switched in the step 3, and the current vehicle speed detected in the step 5 is smaller than a first preset vehicle speed value; in the step 1, the comparison difference between the front fuel quantity information and the rear fuel quantity information is obtained from the comparison difference between the front fuel quantity information and the rear fuel quantity information of the same oil tank.
Further, in step 3, detecting whether the fuel oil tank is switched or not by detecting a fuel oil switch state signal; and under the condition that the fuel switch state signal is switched in two different states, judging that the fuel oil tank is switched.
This embodiment still provides an unusual alarm device of car fuel quantity, unusual alarm device of car fuel quantity includes: a fuel sensor for detecting a vehicle fuel amount; a meter, having: the vehicle fuel quantity abnormality judgment unit is used for detecting whether the vehicle fuel quantity is abnormal or not, and judging that the fuel quantity is abnormal under the condition that the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than a first alarm value; an ignition state detection unit for detecting a current ignition state of the vehicle; a fuel tank switching determination unit that detects whether or not switching of the fuel tank occurs when the ignition state detection unit determines that the ignition is on; the output unit is used for periodically detecting whether the vehicle fuel quantity is abnormal or not by the vehicle fuel quantity abnormal judging unit under the condition that the ignition state detecting unit judges that the ignition is in the off state, the post fuel quantity information is the percentage value of the currently detected fuel quantity, the front fuel quantity information is the percentage value of the fuel quantity recorded and stored when the key ignition state is in the off state, and under the condition that the vehicle fuel quantity abnormal judging unit judges that the fuel quantity is abnormal, the output unit sends out fuel quantity abnormal alarm information, carries out fuel alarm voice broadcast through an alarm and sends a fuel quantity abnormal message to a client terminal through a vehicle bus; and the fuel quantity abnormal judgment unit is used for sending fuel quantity abnormal alarm information under the conditions that the vehicle fuel quantity abnormal judgment unit judges that the fuel quantity is abnormal, the ignition state detection unit judges that the ignition is in an on state, and the fuel tank switching judgment unit does not detect that the fuel tank is switched, carrying out fuel alarm voice broadcasting through the alarm and sending a fuel quantity abnormal message to the client terminal through the vehicle bus.
Further, the cycle of "periodically detecting the vehicle fuel amount" of the vehicle fuel amount abnormality determination unit includes: the fuel consumption monitoring system comprises a self-awakening period and a sleeping period, wherein the self-awakening period is smaller than the sleeping period, and the fuel quantity of the vehicle is detected in the self-awakening period and whether the fuel quantity of the vehicle is abnormal or not is judged.
Further, the self-wake-up period is set to 3s, and the sleep period is set to 180 s.
Further, the abnormal alarm device for the automobile fuel quantity further comprises: a vehicle speed sensor for detecting a current vehicle speed in a case where the ignition state detection unit determines that the ignition is on; the meter further has: a pre-fuel information updating and storing unit, configured to update and store current fuel information as the pre-fuel information when the vehicle fuel quantity abnormality determination unit determines that the fuel quantity is abnormal, the ignition state detection unit determines that the ignition is on, the fuel tank switching determination unit determines that the fuel tank is switched, and the current vehicle speed detected by the vehicle speed sensor is less than a first preset vehicle speed value; the comparison difference between the front fuel quantity information and the rear fuel quantity information in the vehicle fuel quantity abnormality judgment unit is obtained from the comparison difference between the front fuel quantity information and the rear fuel quantity information of the same fuel tank.
Further, the fuel tank switching judgment unit detects whether the fuel tank is switched or not by detecting a fuel switch state signal; and under the condition that the fuel switch state signal is switched in two different states, judging that the fuel oil tank is switched.
The invention uses the combination meter to combine with the sound alarm device, the terminal and the mobile phone APP or the monitoring platform to realize the function of abnormal fuel quantity alarm, monitors the abnormal fuel quantity in real time and alarms, can effectively remind a user of the abnormal fuel quantity of a vehicle and reduce the probability of vehicle fuel theft.
Drawings
FIG. 1 is a schematic block diagram of an abnormal fuel quantity alarm device for a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a meter in the fuel quantity abnormality warning apparatus of the automobile shown in FIG. 1;
FIG. 3 is a schematic diagram illustrating a fuel quantity abnormality determination method in the fuel quantity abnormality warning method for the vehicle according to the embodiment of the invention;
fig. 4 is a schematic diagram of a method for judging switching between a main fuel tank and a secondary fuel tank in the method for alarming abnormality in fuel quantity of an automobile according to the embodiment of the invention.
Detailed Description
In the drawings, the same or similar reference numerals are used to denote the same or similar elements or elements having the same or similar functions. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
As shown in fig. 1 to 4, the method for alarming abnormality of fuel amount of an automobile provided by the embodiment includes:
step 1, judging whether the fuel quantity of a vehicle is abnormal: the vehicle fuel quantity comprises front fuel quantity information and rear fuel quantity information, and the fuel quantity is judged to be abnormal when the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than a first alarm value. Wherein: the post-fuel amount information may be understood as the currently detected fuel amount. The pre-fuel amount information may be understood as the current last detected fuel amount. The front fuel amount information is a fuel percentage value recorded in the EEPROM after the key OFF, and the fuel percentage value is detected every 40ms, which is a post fuel amount percentage value that is not stored in the EEPROM. The first alarm value may be set to 15% according to the detection accuracy of the fuel sensor investigated by the market. If the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than or equal to 15%, the fuel leakage is determined, and then the alarm of the fuel leakage is triggered.
And 2, detecting the current ignition state of the vehicle. Generally, when the key is in the ON state, the meter is in the normal operating state, i.e., the current ignition ON state of the vehicle. When the vehicle key is in the OFF state, i.e., the current ignition OFF state of the vehicle.
And 3, detecting whether the fuel oil tank is switched or not under the condition that the ignition on state is judged in the step 2. Preferably, in step 3, whether the fuel tank is switched is detected by detecting a fuel switch state signal; and under the condition that the fuel switch state signal is switched in two different states, judging that the fuel oil tank is switched.
And 4, alarming for abnormal fuel quantity, which specifically comprises the following steps:
in step 41, in the case that the off state is determined in step 2, the vehicle fuel amount is periodically detected, and the step 1 is proceeded, and the post fuel amount information is the currently detected fuel amount percentage value, and the pre fuel amount information is the fuel amount percentage value recorded and saved when the key ignition state is in the off state; and (2) under the condition that the fuel quantity is judged to be abnormal in the step (1), sending abnormal fuel quantity alarm information, carrying out fuel alarm voice broadcast and sending the abnormal fuel quantity message to a client terminal through a vehicle bus. Wherein periodically detecting a period in vehicle fuel quantity comprises: the fuel consumption monitoring system comprises a self-awakening period T1 and a sleeping period T2, wherein the self-awakening period T1 is smaller than the sleeping period T2, and the fuel quantity of the vehicle is detected and whether the fuel quantity of the vehicle is abnormal or not is judged in the self-awakening period T1. Such as: the self-wake period T1 is set to 3s, and the sleep period T2 is set to 180 s.
And 42, under the conditions that the fuel quantity is judged to be abnormal in the step 1, the ignition on state is judged in the step 2, and the fuel tank is not detected to be switched in the step 3, sending out fuel quantity abnormal alarm information, carrying out fuel alarm voice broadcast and sending a fuel quantity abnormal message to a client terminal through a vehicle bus.
This embodiment uses combination meter to combine audible alarm device and terminal and cell-phone APP or monitor platform, realizes the function of the unusual warning of fuel volume to real-time supervision fuel volume is unusual and reports to the police, can remind the unusual condition of user's vehicle fuel volume effectively, reduces the stolen probability of vehicle fuel.
In one embodiment, the method for alarming abnormality of fuel amount of an automobile provided by the embodiment further includes:
and step 5, detecting the current vehicle speed under the condition that the ignition is in the on state in the step 2.
Step 6, updating and storing the current fuel quantity information as the pre-fuel quantity information under the conditions that the fuel quantity is judged to be abnormal in the step 1, the ignition on state is judged in the step 2, the fuel tank is judged to be switched in the step 3, and the current vehicle speed detected in the step 5 is smaller than a first preset vehicle speed value; in the step 1, the comparison difference between the front fuel quantity information and the rear fuel quantity information is obtained from the comparison difference between the front fuel quantity information and the rear fuel quantity information of the same oil tank.
As shown in fig. 1 and fig. 2, the fuel quantity abnormality warning device for the automobile provided by the present embodiment includes a fuel sensor 1 and a meter 2, wherein:
the fuel sensor 1 is used to detect the vehicle fuel amount. The vehicle fuel quantity comprises front fuel quantity information and rear fuel quantity information, and the fuel quantity is judged to be abnormal when the ratio of the front fuel quantity information to the rear fuel quantity information is larger than a first alarm value. Wherein: the post-fuel amount information may be understood as the currently detected fuel amount. The pre-fuel amount information may be understood as the current last detected fuel amount. The front fuel amount information is a fuel percentage value recorded in the EEPROM after the key OFF, and the fuel percentage value is detected every 40ms, which is a post fuel amount percentage value that is not stored in the EEPROM. The first alarm value may be set to 15% according to the detection accuracy of the fuel sensor investigated by the market. If the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than or equal to 15%, the fuel leakage is determined, and then the alarm of the fuel leakage is triggered.
The meter 2 has a vehicle fuel amount abnormality determination unit 21, an ignition state detection unit 22, an output unit 23, and a fuel tank switching determination unit 24, in which:
the vehicle fuel quantity abnormality determination unit 21 is configured to detect whether a vehicle fuel quantity is abnormal, and determine that the fuel quantity is abnormal when a comparison difference between the front fuel quantity information and the rear fuel quantity information is greater than a first alarm value. Wherein: the post fuel amount information may be understood as a currently detected fuel amount, and the pre fuel amount information may be understood as a currently last detected fuel amount. The first alarm value may be set to 15% according to the detection accuracy of the fuel sensor investigated by the market. The first alarm value means that the difference between the currently detected fuel amount (post fuel amount information) and the last detected fuel amount (pre fuel amount information) is 15%.
The ignition state detecting unit 22 is used for detecting and determining the current ignition-on state of the vehicle. When the key is in the ON state, the meter is in the normal working state, namely the current ignition ON state of the vehicle. When the vehicle key is in the OFF state, i.e., the current ignition OFF state of the vehicle.
The fuel tank switching determination unit 24 detects whether or not the fuel tank is switched when the ignition state detection unit 22 determines that the ignition is on. Preferably, in step 3, whether the fuel tank is switched is detected by detecting a fuel switch state signal; and under the condition that the fuel switch state signal is switched in two different states, judging that the fuel oil tank is switched.
The output unit 23 is configured to, when the ignition state detection unit 22 determines that the ignition is turned off, periodically detect whether the vehicle fuel amount is abnormal by the vehicle fuel amount abnormality determination unit 21, where the post fuel amount information is a percentage of the currently detected fuel amount, the pre fuel amount information is a percentage of the fuel amount recorded and stored in a key ignition state in the turned off state, and, when the vehicle fuel amount abnormality determination unit 21 determines that the fuel amount is abnormal, send out fuel amount abnormality alarm information, perform fuel alarm voice broadcast, and send a fuel amount abnormality message to the client terminal through the vehicle bus. In conjunction with fig. 3 and 4, the cycle of "periodically detecting the vehicle fuel amount" of the vehicle fuel amount abnormality determination unit 21 includes: a self-awakening period T1 and a sleeping period T2, wherein the self-awakening period T1 is less than the sleeping period T2, and the fuel quantity of the vehicle is detected and whether the fuel quantity of the vehicle is abnormal is judged in the self-awakening period T1. The self-awake period T1 is set to 3s, and the sleep period T2 is set to 180 s.
The output unit 23 is further configured to send fuel quantity abnormality alarm information through the alarm 3, perform fuel alarm voice broadcast, and send a fuel quantity abnormality message to the client terminal through the vehicle bus when the vehicle fuel quantity abnormality determination unit 21 determines that the fuel quantity is abnormal, the ignition state detection unit 22 determines that the ignition is on, and the fuel tank switching determination unit 24 does not detect that the fuel tank is switched.
This embodiment uses combination meter to combine audible alarm device and terminal and cell-phone APP or monitor platform, realizes the function of the unusual warning of fuel volume to real-time supervision fuel volume is unusual and reports to the police, can remind the unusual condition of user's vehicle fuel volume effectively, reduces the stolen probability of vehicle fuel.
In one embodiment, the vehicle fuel quantity abnormality warning device further includes a vehicle speed sensor 5, wherein:
the vehicle speed sensor 5 is used to detect the current vehicle speed in the case where the ignition-on state is determined by the ignition state detection unit 22.
The meter 2 also has a pre-fuel amount information update storage unit 25 in which:
the front fuel quantity information updating storage unit 25 is used for updating and storing the current fuel quantity information as the front fuel quantity information under the conditions that the vehicle fuel quantity abnormality judgment unit 21 judges that the fuel quantity is abnormal, the ignition state detection unit 22 judges that the ignition is on, the fuel tank switching judgment unit 24 judges that the fuel tank is switched, and the current vehicle speed detected by the vehicle speed sensor 5 is less than a first preset vehicle speed value; the "comparison difference between the front fuel amount information and the rear fuel amount information" in the vehicle fuel amount abnormality determination unit 21 is obtained from the comparison difference between the front fuel amount information and the rear fuel amount information of the same fuel tank.
As shown in fig. 3 and 4, the method for alarming abnormality of fuel amount of an automobile provided by the above embodiment will be described according to different situations of ignition state and vehicle speed:
the first case: when the key is in an OFF gear, namely the current ignition state of the vehicle is judged to be in an OFF state, the instrument 2 is awakened at the self-timing of every 3min to detect whether the fuel quantity of the vehicle is abnormal or not, and if a fuel abnormal signal is detected, the high-level signal is sent to the alarm 3 once in the first detected period, namely the alarm 3 mounted on the vehicle works once (considering that the power consumption of a storage battery is too large when the alarm 3 works once every 3min at night, the vehicle can not be started in the next day, and the alarm 3 works once after the abnormal fuel is detected); however, after the fuel abnormality is detected, the fuel abnormality is still sent to the VDR6 through a message after the meter 2 is awakened every 3min until the fuel abnormality alarm is eliminated, and the VDR6 stops sending alarm information to the mobile phone APP or the terminal.
The second case: when the key is in an OFF gear, namely the current ignition state of the vehicle is judged to be an OFF state, the instrument 2 is awakened at the self-timing of every 3min, whether the fuel quantity of the vehicle is abnormal or not is detected, if the abnormality is not detected, the instrument 2 outputs low level/suspension to the alarm 3, and the instrument 2 immediately enters the dormancy state.
In the third situation, when the key is in an ON gear, namely the current ignition state of the vehicle is judged to be in an open state, the fuel abnormal signal is continuously detected, and if the fuel abnormal signal occurs, the alarm 3 always has alarm voice broadcast of the fuel abnormality; meanwhile, the fuel abnormity message is continuously sent to the VDR6 until the fuel abnormity alarm signal is cleared, and then the signal sent to the alarm 3 and the VDR6 is stopped.
And a fourth situation which is a special situation based on the third situation, as shown in fig. 4, if the digital quantity input 'fuel switch state signal' is changed from high to other states (low or suspended), the meter 2 detects that the fuel tank is switched, and at the moment, under the condition that the vehicle speed is more than or equal to 0 and less than 5km/h, the current fuel quantity information is updated and stored as the previous fuel quantity information, and no alarm signal is sent out.
In the fifth situation, when the key is in the ON gear and the vehicle speed is more than or equal to 5km/h, the fuel leakage detection function is not needed.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Those of ordinary skill in the art will understand that: modifications can be made to the technical solutions described in the foregoing embodiments, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. An alarm method for abnormal automobile fuel quantity is characterized by comprising the following steps:
step 1, judging whether the fuel quantity of a vehicle is abnormal: the vehicle fuel quantity comprises front fuel quantity information and rear fuel quantity information, and the fuel quantity is judged to be abnormal when the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than a first alarm value;
step 2, detecting the current ignition state of the vehicle;
step 3, detecting whether the fuel oil tank is switched or not under the condition that the ignition on state is judged in the step 2;
and 4, alarming for abnormal fuel quantity, which specifically comprises the following steps:
step 41, under the condition that the vehicle is judged to be in the off state in the step 2, periodically detecting the fuel quantity of the vehicle, and entering the step 1, wherein the post-fuel quantity information is the percentage value of the currently detected fuel quantity, and the pre-fuel quantity information is the percentage value of the fuel quantity recorded and stored when the ignition state is in the off state; the period of "periodically detecting the vehicle fuel amount" includes: a self-wake-up period (T1) and a sleep period (T2), wherein the self-wake-up period (T1) is smaller than the sleep period (T2), and step 1 is entered in the self-wake-up period (T1);
under the condition that the fuel quantity is judged to be abnormal in the step 1, sending abnormal fuel quantity alarm information, carrying out fuel alarm voice broadcast and sending abnormal fuel quantity messages to a client terminal through a vehicle bus;
step 42, under the conditions that the fuel quantity is judged to be abnormal in the step 1, the ignition on state is judged in the step 2, and the fuel tank is not detected to be switched in the step 3, fuel quantity abnormal alarm information is sent out, fuel alarm voice broadcasting is carried out, and a fuel quantity abnormal message is sent to a client terminal through a vehicle bus;
step 5, detecting the current vehicle speed under the condition that the ignition is in the on state in the step 2;
step 6, updating and storing the current fuel quantity information as the pre-fuel quantity information under the conditions that the fuel quantity is judged to be abnormal in the step 1, the ignition on state is judged in the step 2, the fuel tank is judged to be switched in the step 3, and the current vehicle speed detected in the step 5 is smaller than a first preset vehicle speed value; in the step 1, the comparison difference between the front fuel quantity information and the rear fuel quantity information is obtained from the comparison difference between the front fuel quantity information and the rear fuel quantity information of the same oil tank.
2. The fuel quantity abnormality warning method for an automobile according to claim 1, wherein the self-awakening period (T1) is set to 3s, and the sleeping period (T2) is set to 180 s.
3. The method for alarming abnormality in fuel quantity of an automobile according to claim 1, characterized in that in step 3, whether the fuel tank is switched or not is detected by detecting a fuel switch state signal; and under the condition that the fuel switch state signal is switched in two different states, judging that the fuel oil tank is switched.
4. An abnormal alarm device for automobile fuel quantity is characterized by comprising:
a fuel sensor (1) for detecting a vehicle fuel amount;
a meter (2) having:
the abnormal vehicle fuel quantity judging unit (21) is used for detecting whether the vehicle fuel quantity is abnormal or not, and judging that the fuel quantity is abnormal under the condition that the comparison difference value of the front fuel quantity information and the rear fuel quantity information is larger than a first alarm value; the cycle of the vehicle fuel quantity abnormality determination unit (21) 'periodically detecting the vehicle fuel quantity' includes: a self-awakening period (T1) and a sleeping period (T2), wherein the self-awakening period (T1) is less than the sleeping period (T2), and the fuel quantity of the vehicle is detected and whether the fuel quantity of the vehicle is abnormal is judged in the self-awakening period (T1);
an ignition state detection unit (22) for detecting a current ignition state of the vehicle;
a fuel tank switching determination means (24) for detecting whether or not the fuel tank is switched when the ignition state detection means (22) determines that the ignition is on;
the output unit (23) is used for periodically detecting whether the vehicle fuel quantity is abnormal or not by the vehicle fuel quantity abnormality judgment unit (21) under the condition that the ignition state detection unit (22) judges that the ignition is in the off state, the post fuel quantity information is the percentage value of the currently detected fuel quantity, the pre fuel quantity information is the percentage value of the fuel quantity recorded and stored when the key ignition state is in the off state, and under the condition that the vehicle fuel quantity abnormality judgment unit (21) judges that the fuel quantity is abnormal, the output unit sends out fuel quantity abnormality alarm information, carries out fuel alarm voice broadcast through the alarm (3) and sends the fuel quantity abnormality message to a client terminal through a vehicle bus; the fuel quantity abnormal judgment unit (21) is used for judging that the fuel quantity is abnormal, the ignition state detection unit (22) is judged to be in an ignition on state, and the fuel tank switching judgment unit (24) does not detect the situation that the fuel tank is switched, sending fuel quantity abnormal alarm information, carrying out fuel alarm voice broadcast through an alarm (3) and sending a fuel quantity abnormal message to a client terminal through a vehicle bus;
a vehicle speed sensor (5) for detecting a current vehicle speed in a case where the ignition state detection unit (22) determines that the ignition is on;
the meter (2) further comprises:
a pre-fuel information update storage unit (25) for updating and storing current fuel information as the pre-fuel information in a case where the vehicle fuel abnormality determination unit (21) determines that the fuel is abnormal, the ignition state detection unit (22) determines that the ignition is on, the fuel tank switching determination unit (24) determines that the fuel tank is switched, and the current vehicle speed detected by the vehicle speed sensor (5) is less than a first preset vehicle speed value; the comparison difference between the front fuel quantity information and the rear fuel quantity information in the vehicle fuel quantity abnormity judgment unit (21) is obtained by the comparison difference between the front fuel quantity information and the rear fuel quantity information of the same oil tank.
5. The fuel quantity abnormality warning device for the automobile according to claim 4, wherein the self-awakening period (T1) is set to 3s, and the sleeping period (T2) is set to 180 s.
6. The abnormal fuel quantity alarm device of the automobile as claimed in claim 4, wherein the fuel tank switching judgment unit (24) detects whether the fuel tank is switched by detecting the fuel switch status signal; and under the condition that the fuel switch state signal is switched in two different states, judging that the fuel oil tank is switched.
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