CN112664294A - Engine oil liquid level detection method and device - Google Patents
Engine oil liquid level detection method and device Download PDFInfo
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- CN112664294A CN112664294A CN202110140757.0A CN202110140757A CN112664294A CN 112664294 A CN112664294 A CN 112664294A CN 202110140757 A CN202110140757 A CN 202110140757A CN 112664294 A CN112664294 A CN 112664294A
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- 239000010705 motor oil Substances 0.000 title claims abstract description 62
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 title claims description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 106
- 239000003921 oil Substances 0.000 claims abstract description 88
- 238000005070 sampling Methods 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 57
- 238000009825 accumulation Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000011897 real-time detection Methods 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention discloses a method and a device for detecting the oil level.A heating circuit of an oil level sensor is started, and the heating circuit is closed after the heating circuit operates for a certain time; reading a sampling voltage U0 of an oil level sensor and a sampling temperature T0 of an oil temperature sensor in response to the starting process of the heating circuit; reading a sampling voltage U1 of the oil level sensor in response to the closing process of the heating circuit; calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor; and acquiring the oil level according to the sampling temperature T0 and the voltage difference value delta U. The engine oil level detection is realized through an electric control software algorithm and an engine oil level and temperature sensor, and the reliability is higher; the engine is suitable for different engine models, and the universality and the applicability are higher; the traditional method for manually observing the oil level indicator is replaced to realize the detection of the oil level, so that the safety is higher; the engine oil level can be detected in real time, and the real-time performance is high.
Description
Technical Field
The invention relates to the field of engine oil liquid level detection, in particular to an engine oil liquid level detection method and device.
Background
Under the general condition, the engine oil level of the engine is judged by inserting an engine oil scale of an engine lubricating system, the operation method is complicated, an engine protecting cover or a turnover cab needs to be opened, and the potential safety hazard is very high. Meanwhile, the traditional method for measuring the oil level by using the oil level gauge cannot accurately measure the oil level and can be carried out under the specific condition of parking, cannot realize real-time continuous monitoring and alarming of the oil level, and has great limitation on the aspect of protecting an engine under all-round and full-working conditions.
Along with the rapid development of the vehicle electric control technology level, the vehicle intelligence level is further improved, and an engine oil liquid level detection alarm system with high real-time performance, high accuracy and high safety is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides the engine oil liquid level detection method and the engine oil liquid level detection device, and the method and the device can improve the rapidness, convenience, accuracy, safety and instantaneity of engine oil liquid level monitoring.
The technical scheme of the invention is as follows: an engine oil liquid level detection method comprises the following steps:
starting a heating circuit of the engine oil level sensor, and closing the heating circuit after running for a certain time;
reading a sampling voltage U0 of an oil level sensor and a sampling temperature T0 of an oil temperature sensor in response to the starting process of the heating circuit;
reading a sampling voltage U1 of the oil level sensor in response to the closing process of the heating circuit;
calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor;
and acquiring the oil level according to the sampling temperature T0 and the voltage difference value delta U.
Further, the method comprises the following steps:
and (4) after the heating circuit is closed for a certain time, restarting the heating circuit, and repeatedly executing the steps to circularly realize the real-time detection of the engine oil liquid level.
Further, the method comprises the following steps:
setting a heating identifier of the heating circuit;
in the operating state of the heating circuit, the heating identifier is set to be 1; in the off state of the heating circuit, the heating identifier is set to 0;
the start-up process in response to the heating circuit refers to a rising edge setting process in response to the heating identifier changing from 0 to 1;
the shutdown process in response to the heating circuit refers to a falling edge set process in response to the heating flag being changed from 1 to 0.
Further, when a vehicle key is powered on, a heating circuit for starting the engine oil level sensor for the first time is triggered.
Further, the method comprises the following steps:
the engine oil temperature sensor collects the engine oil temperature T in real time;
in response to the start-up procedure of the heating circuit, the oil temperature T collected during this procedure is assigned to the sampling temperature T0.
Further, the oil level is obtained according to the sampling temperature T0 and the voltage difference value delta U, and the method specifically comprises the following steps:
and obtaining the oil level through table lookup according to the sampling temperature T0 and the voltage difference value delta U.
Further, the method further comprises a fault detection process, which specifically comprises:
detecting whether the original sampling voltage of the engine oil temperature sensor is within a certain temperature threshold range, if so, judging whether the continuous accumulation time which does not conform to the temperature threshold range exceeds a certain time threshold, if so, judging that the engine oil temperature sensor fails, otherwise, judging that the engine oil temperature sensor does not have a fault;
detecting whether the sampling voltage U0 is within a certain voltage threshold range, if so, determining no fault, otherwise, determining whether the continuous accumulation time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, determining a fault, otherwise, determining no fault;
detecting whether the sampling voltage U1 is within a certain voltage threshold range, if so, determining no fault, otherwise, determining whether the continuous accumulation time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, determining a fault, otherwise, determining no fault;
detecting whether the voltage difference value delta U is within a certain voltage threshold range, if so, judging whether the continuous accumulated time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, judging that the voltage difference value delta U fails, and otherwise, judging that the voltage difference value delta U does not conform to the voltage threshold range does not exceed a certain time threshold;
and detecting whether the oil level is within a certain liquid level threshold range, if so, having no fault, otherwise, judging whether the continuous accumulated time which is not in accordance with the liquid level threshold range exceeds a certain time threshold, if so, having a fault, otherwise, having no fault.
The technical scheme of the invention also comprises an engine oil liquid level detection device, which comprises,
a heating circuit control module: controlling the heating circuit to be started and closed;
heating circuit state monitoring module: monitoring the operating state of the heating circuit;
a temperature reading module: reading the sampling temperature T0 of the oil temperature sensor in response to the starting process of the heating circuit;
a first voltage reading module: reading a sampling voltage U0 of an oil level sensor in response to a starting process of a heating circuit;
a second voltage reading module: reading a sampling voltage U1 of the oil level sensor in response to the closing process of the heating circuit;
a voltage difference value calculation module: calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor;
an engine oil level acquisition module: and acquiring the oil level according to the sampling temperature T0 and the voltage difference value delta U.
Compared with the prior art, the method and the device for detecting the oil level have the following beneficial effects:
1) the detection of the engine oil liquid level is realized through an electric control software algorithm and an engine oil liquid level and temperature sensor, and the reliability is higher;
2) the application range is wide, the engine oil lubricating oil is suitable for all commercial vehicle diesel engines and passenger vehicle gasoline engines lubricated by engine oil, is suitable for different engine models, and has high universality and applicability;
3) the oil level detection can be realized by replacing the traditional method of manually observing an oil gauge, and the safety is higher;
4) the engine oil level detection device is realized in the form of electric control software and a sensor, can detect the engine oil level in real time, covers the whole operating condition of a vehicle, and has high real-time performance.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a second structure according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.
Example one
As shown in fig. 1, the embodiment provides an engine oil level detection method, which includes the following steps:
s1, starting a heating circuit of the engine oil level sensor, and closing the heating circuit after running for a certain time;
s2, responding to the starting process of the heating circuit, reading the sampling voltage U0 of the oil level sensor and the sampling temperature T0 of the oil temperature sensor;
s3, responding to the closing process of the heating circuit, reading the sampling voltage U1 of the oil level sensor;
s4, calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor;
and S5, acquiring the oil level according to the sampling temperature T0 and the voltage difference delta U.
It should be noted that, because the performance of the engine oil, the engine oil liquid level is influenced by the temperature, so this embodiment detects the engine oil liquid level with the temperature as a factor, improves the precision of detecting. Therefore, when the method is implemented, the engine oil temperature is detected through the engine oil temperature sensor, and the engine oil level is finally determined by detecting the related voltage through the engine oil level sensor. The engine oil level sensor is a sensor with a heating circuit, and when the sensor detects a signal, the heating circuit needs to be started to align for heating (the engine oil level sensor only needs to adopt the existing sensor, and the details are not repeated here).
In the step S5 of this embodiment, the oil level is obtained according to the sampling temperature T0 and the voltage difference Δ U, specifically, according to the sampling temperature T0 and the voltage difference Δ U, the oil level is obtained by looking up the table. The method is characterized in that a lookup table is stored in advance, a plurality of groups of relationships among the sampling temperature T0, the voltage difference value delta U and the oil level are stored in the lookup table, and the oil level can be obtained by looking up the table after the sampling temperature T0 and the voltage difference value delta U are obtained. The engine oil level can be informed or displayed to the user immediately after being known, and the alarm is given when the engine oil level is abnormal.
The steps are an interval detection process, the heating circuit is preferably restarted after being turned off for a certain time, and then the steps S1-S5 are executed repeatedly, so that the steps are executed circularly, the liquid level is read once at every fixed time interval, and the real-time detection of the liquid level is realized.
The first time the heating circuit is started is triggered by the power-on of the vehicle key, that is, the heating circuit of the oil level sensor is started to start the detection of each signal once the power-on of the vehicle key is detected.
The present embodiment sets a heating flag of the heating circuit, responds to the open/closed state of the heating circuit by detecting the heating flag, and reads each signal.
Specifically, in the operating state of the heating circuit, the heating identifier of the heating circuit is set to 1; in the off state of the heating circuit, the heating flag thereof is set to 0. The startup process in response to the heating circuit refers to the setting process in response to the rising edge of the heating identifier from 0 to 1, i.e., reading the sampled voltage U0 and adopting the temperature T0 at the rising edge of 0 to 1. The shutdown process in response to the heating circuit refers to a falling edge setting process in response to the heating identifier being changed from 1 to 0, i.e., the sampling voltage U1 is read at the falling edge of 1 to 0.
It should be noted that the oil temperature sensor of the present embodiment detects the oil temperature T in real time, and assigns the oil temperature T detected at this time to the sampling temperature T0 for reading when the heating circuit is started (i.e., from 0 to 1).
In summary, the implementation process of the present embodiment mainly involves the detection and calculation of the following signals: the heating circuit heats the identifier, the oil temperature T0, the sampling voltage U0 of the oil level sensor, the sampling voltage U1 of the oil level sensor, the difference value delta U of the sampling voltage and the oil level. A specific embodiment is provided below to illustrate each signal:
1) the heating circuit heats the identifier: when the vehicle key electricity T15 is powered on for the first time, namely the rising edge of the key electricity state is detected, the heating identifier is set to be 1, namely the heating circuit is opened to heat the oil level sensor for subsequent level signal voltage sampling, the heating identifier is reset to be 0 after the timing 1 is accumulated for 0.6s, and the heating circuit is closed. After that, the timer 2 starts to be executed, the heating identifier is set to 1 every time the timer 2 is accumulated to a certain time threshold, the heating circuit is opened, the timer 1 is executed, and the heating identifier is reset to 0 after the timer 1 is accumulated for 0.6s, and the heating circuit is closed. The method is repeatedly executed to realize the reading of the liquid level once at fixed time intervals, thereby realizing the real-time detection of the liquid level.
2) Temperature T of engine oil: the engine oil liquid level temperature signal is sampled in real time and is input into the central processing unit of the controller through the AD port in the form of analog signals, and the computer oil temperature T is checked according to the signal characteristic value of the temperature sensor.
3) Oil temperature T0: when the heating circuit heating identifier is set at the instant of time when the rising edge is generated (namely, the rising edge is changed from 0 to 1), the oil temperature T at the moment is assigned to the oil temperature T0, namely, the temperature detected by the oil temperature sensor at the rising edge of the heating identifier.
4) Sampling voltage of engine oil level sensor U0: the oil level sensor signal voltage value read when the heater circuit heating identifier is momentarily set producing a rising edge (i.e., from 0 to 1).
5) Sampling voltage of engine oil level sensor U1: the oil level sensor signal voltage value read when the heater circuit heating identifier is momentarily set producing a falling edge (i.e., 1 to 0).
6) Sampling voltage difference value Δ U: the oil level sensor sampling voltage is calculated by the difference value of the oil level sensor sampling voltage U0 and the oil level sensor sampling voltage U1.
7) Oil level: the temperature is calculated according to the temperature T0 of the engine oil and a lookup table adopting the voltage difference value delta U.
The embodiment further sets a fault detection process, which specifically includes fault detection in the following aspects:
detecting whether the original sampling voltage of the engine oil temperature sensor is within a certain temperature threshold range, if so, determining that no fault exists, otherwise, determining whether the continuous accumulation time which is not in accordance with the temperature threshold range exceeds a certain time threshold, if so, determining that the fault exists, otherwise, determining that the fault does not exist (it needs to be stated that the original sampling signal of the engine oil temperature sensor is a voltage signal, acquiring the engine oil temperature through table lookup after the voltage is acquired, and in the embodiment, determining whether the sampling of the engine oil temperature sensor is in fault through detecting the original voltage signal);
detecting whether the sampling voltage U0 is within a certain voltage threshold range, if so, determining no fault, otherwise, determining whether the continuous accumulation time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, determining a fault, otherwise, determining no fault;
detecting whether the sampling voltage U1 is within a certain voltage threshold range, if so, determining no fault, otherwise, determining whether the continuous accumulation time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, determining a fault, otherwise, determining no fault;
detecting whether the voltage difference value delta U is within a certain voltage threshold range, if so, judging whether the continuous accumulated time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, judging that the voltage difference value delta U fails, and otherwise, judging that the voltage difference value delta U does not conform to the voltage threshold range does not exceed a certain time threshold;
and detecting whether the oil level is within a certain liquid level threshold range, if so, having no fault, otherwise, judging whether the continuous accumulated time which is not in accordance with the liquid level threshold range exceeds a certain time threshold, if so, having a fault, otherwise, having no fault.
It should be noted that, the above process of determining whether a fault occurs detects that whether the time threshold exceeds a certain time threshold is a millisecond time threshold, taking the voltage U0 as an example, when the voltage U0 exceeds the voltage threshold, it is determined whether the time threshold exceeds the certain time threshold, and if so, there is no fault, so as to prevent a detection fault.
Example two
As shown in fig. 2, the present embodiment provides an oil level detection device, which implements the method steps of the first embodiment.
The device can be integrated in vehicle chassis domain control software or engine electronic control software, and is powered, initialized and calculated by a vehicle chassis domain control system or an engine electronic control system.
The device comprises the following functional modules:
heating circuit control module 1: controlling the heating circuit to be started and closed;
heating circuit state monitoring module 2: monitoring the operating state of the heating circuit;
temperature reading module 3: reading the sampling temperature T0 of the oil temperature sensor in response to the starting process of the heating circuit;
the first voltage reading module 4: reading a sampling voltage U0 of an oil level sensor in response to a starting process of a heating circuit;
the second voltage reading module 5: reading a sampling voltage U1 of the oil level sensor in response to the closing process of the heating circuit;
voltage difference value calculation module 6: calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor;
engine oil level acquisition module 7: and acquiring the oil level according to the sampling temperature T0 and the voltage difference value delta U.
The heating circuit control module 1 controls the heating circuit to be started and closed according to set timing duration, and the heating circuit state monitoring module 2 monitors the operation state of the heating circuit by detecting a heating identifier.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. The engine oil liquid level detection method is characterized by comprising the following steps:
starting a heating circuit of the engine oil level sensor, and closing the heating circuit after running for a certain time;
reading a sampling voltage U0 of an oil level sensor and a sampling temperature T0 of an oil temperature sensor in response to the starting process of the heating circuit;
reading a sampling voltage U1 of the oil level sensor in response to the closing process of the heating circuit;
calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor;
and acquiring the oil level according to the sampling temperature T0 and the voltage difference value delta U.
2. The oil level detection method of claim 1, further comprising the steps of:
and (3) restarting the heating circuit after closing the heating circuit for a certain time, and repeatedly executing the steps in the claim 1, thereby circularly realizing the real-time detection of the oil level.
3. The oil level detection method of claim 1 or 2, further comprising the steps of:
setting a heating identifier of the heating circuit;
in the operating state of the heating circuit, the heating identifier is set to be 1; in the off state of the heating circuit, the heating identifier is set to 0;
the start-up process in response to the heating circuit refers to a rising edge setting process in response to the heating identifier changing from 0 to 1;
the shutdown process in response to the heating circuit refers to a falling edge set process in response to the heating flag being changed from 1 to 0.
4. The oil level detection method of claim 3, wherein a heating circuit that first activates the oil level sensor is triggered when a vehicle key is powered on.
5. The oil level detection method of claim 1, 2 or 4, further comprising the steps of:
the engine oil temperature sensor collects the engine oil temperature T in real time;
in response to the start-up procedure of the heating circuit, the oil temperature T collected during this procedure is assigned to the sampling temperature T0.
6. The oil level detection method according to claim 1, 2 or 4, characterized in that the oil level is obtained from the sampled temperature T0 and the voltage difference Δ U, specifically:
and obtaining the oil level through table lookup according to the sampling temperature T0 and the voltage difference value delta U.
7. The oil level detection method according to claim 1, 2 or 4, characterized in that the method further comprises a fault detection process, in particular comprising:
detecting whether the original sampling voltage of the engine oil temperature sensor is within a certain temperature threshold range, if so, judging whether the continuous accumulation time which does not conform to the temperature threshold range exceeds a certain time threshold, if so, judging that the engine oil temperature sensor fails, otherwise, judging that the engine oil temperature sensor does not have a fault;
detecting whether the sampling voltage U0 is within a certain voltage threshold range, if so, determining no fault, otherwise, determining whether the continuous accumulation time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, determining a fault, otherwise, determining no fault;
detecting whether the sampling voltage U1 is within a certain voltage threshold range, if so, determining no fault, otherwise, determining whether the continuous accumulation time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, determining a fault, otherwise, determining no fault;
detecting whether the voltage difference value delta U is within a certain voltage threshold range, if so, judging whether the continuous accumulated time which does not conform to the voltage threshold range exceeds a certain time threshold, if so, judging that the voltage difference value delta U fails, and otherwise, judging that the voltage difference value delta U does not conform to the voltage threshold range does not exceed a certain time threshold;
and detecting whether the oil level is within a certain liquid level threshold range, if so, having no fault, otherwise, judging whether the continuous accumulated time which is not in accordance with the liquid level threshold range exceeds a certain time threshold, if so, having a fault, otherwise, having no fault.
8. An engine oil liquid level detection device is characterized by comprising,
a heating circuit control module: controlling the heating circuit to be started and closed;
heating circuit state monitoring module: monitoring the operating state of the heating circuit;
a temperature reading module: reading the sampling temperature T0 of the oil temperature sensor in response to the starting process of the heating circuit;
a first voltage reading module: reading a sampling voltage U0 of an oil level sensor in response to a starting process of a heating circuit;
a second voltage reading module: reading a sampling voltage U1 of the oil level sensor in response to the closing process of the heating circuit;
a voltage difference value calculation module: calculating a voltage difference value delta U between a sampling voltage U0 and a sampling voltage U1 of the oil level sensor;
an engine oil level acquisition module: and acquiring the oil level according to the sampling temperature T0 and the voltage difference value delta U.
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| CN202110140757.0A CN112664294A (en) | 2021-02-02 | 2021-02-02 | Engine oil liquid level detection method and device |
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| CN202110140757.0A CN112664294A (en) | 2021-02-02 | 2021-02-02 | Engine oil liquid level detection method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739871A (en) * | 2021-08-27 | 2021-12-03 | 上海金脉汽车电子有限公司 | Engine oil liquid level detection device and detection method thereof |
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| US10760460B1 (en) * | 2019-06-12 | 2020-09-01 | Ford Global Technologies, Llc | Method and system for engine oil level sensing |
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2021
- 2021-02-02 CN CN202110140757.0A patent/CN112664294A/en active Pending
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| CN101441131A (en) * | 2008-12-08 | 2009-05-27 | 奇瑞汽车股份有限公司 | Engine oil consumption quantity measuring instrument |
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Application publication date: 20210416 |