CN114812717A - Vehicle-mounted oil consumption meter, oil consumption detection system and measurement method - Google Patents

Abstract

The invention belongs to the technical field of engine performance testing, and discloses a vehicle-mounted oil consumption instrument, an oil consumption detection system and a measurement method, wherein the vehicle-mounted oil consumption instrument is arranged between an oil tank and an engine and comprises an oil inlet measurement unit and an oil return measurement unit; the fuel oil flowing out of the engine flows back into the oil tank through the oil return pipe and the oil return pipe assembly, and the fourth thermistor, the second heater and the third thermistor are sequentially arranged on the oil return pipe assembly along the flow direction of the fuel oil. According to the invention, the fuel oil flowing out of the engine flows through the oil return measuring unit of the vehicle-mounted oil consumption meter and then returns to the oil tank, so that the measuring precision is higher.

Description

Vehicle-mounted oil consumption meter, oil consumption detection system and measurement method

Technical Field

The invention relates to the technical field of engine performance testing, in particular to a vehicle-mounted oil consumption meter, an oil consumption detection system and a measurement method.

Background

The fuel consumption of the engine is one of the most concerned important performance indexes of engine manufacturers, finished automobile manufacturers and users, and the fuel consumption in an engine laboratory has a mature testing technology for measuring the instantaneous hour fuel consumption, for example, a fuel consumption instrument using the Coriolis principle is additionally provided with a fuel cooling system and a pressure regulating system, so that the fuel state entering the engine can be ensured, and the hour fuel consumption can be accurately measured. However, such a detection scheme cannot be implemented on the whole vehicle, and there is no extra position on the whole vehicle for installing such a test system with a large floor space, and there is no way to provide a cooling medium for adjusting the fuel inlet temperature of the fuel, so in practical application, a fuel consumption meter similar to that used on a test bench is mostly adopted for measuring the fuel consumption of the whole vehicle, but the fuel inlet temperature of the engine is not adjusted, as disclosed in the patent document engineering machinery fuel consumption monitoring system (No. CN207963970U), the fuel consumption meters used therein are connected with the fuel tank through a fuel supply pipe, the engine return pipe is changed from the original mode of directly returning fuel to the fuel tank to return to the outlet of the fuel consumption meter and then to enter the engine after being mixed with the fuel introduced from the fuel tank by the fuel consumption meter, and such a mode has huge technical problems on the whole vehicle test, namely, the oil return temperature of the dispenser is high and the oil return amount is large, the oil is mixed with the oil from the oil tank introduced by the oil consumption meter and then enters the engine, so that the oil inlet temperature of the engine is increased sharply, and particularly when the load is large, the oil inlet temperature of the engine is increased to cause the density of the fuel oil to be reduced, so that the weight of the fuel oil actually entering the engine is obviously reduced, and the oil consumption measurement at the moment can not reflect the actual working condition.

Disclosure of Invention

One object of the present invention is: the fuel oil flowing out of the engine flows through the oil return measuring unit of the vehicle-mounted oil consumption instrument and then returns to the oil tank, and the measuring accuracy is higher.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, an on-vehicle fuel consumption meter is provided and is arranged between a fuel tank and an engine, the on-vehicle fuel consumption meter comprises:

the fuel oil inlet measuring unit comprises a fuel oil inlet pipe assembly, a first thermistor, a second thermistor and a first heater, the fuel oil inlet pipe assembly is connected between the fuel tank and a fuel oil inlet pipe of the engine, fuel oil flowing out of the fuel tank flows into the engine through the fuel oil inlet pipe assembly and the fuel oil inlet pipe, and the first thermistor, the first heater and the second thermistor are sequentially arranged on the fuel oil inlet pipe assembly along the flow direction of the fuel oil;

the oil return measuring unit comprises an oil return pipe assembly, a third thermistor, a fourth thermistor and a second heater, wherein the oil return pipe assembly is connected between the oil tank and an oil return pipe of the engine, fuel oil flowing out of the engine flows through the oil return pipe and the oil return pipe assembly flows back to the inside of the oil tank, and the fourth thermistor, the second heater and the third thermistor are sequentially arranged on the oil return pipe assembly along the flowing direction of the fuel oil.

As an optional technical solution, a distance between the first thermistor and the first heater is equal to a distance between the second thermistor and the first heater;

and a distance between the fourth thermistor and the second heater is equal to a distance between the third thermistor and the second heater.

As an optional technical scheme, the oil inlet pipe assembly comprises an oil inlet main pipe, one end of the oil inlet main pipe is communicated with the oil tank, the other end of the oil inlet main pipe is communicated with the oil inlet pipe, and the pipe diameter of the oil inlet main pipe is equal to that of the oil inlet pipe;

and the oil return pipe assembly comprises an oil return main pipe, one end of the oil return main pipe is communicated with the oil tank, the other end of the oil return main pipe is communicated with the oil return pipe, and the pipe diameter of the oil return main pipe is equal to that of the oil return pipe.

As an optional technical scheme, the pipe diameter of the oil inlet main pipe is equal to that of the oil return main pipe.

As an optional technical scheme, the oil inlet pipe assembly further comprises an oil inlet bypass pipe, one end of the oil inlet bypass pipe is connected to the upstream of the oil inlet main pipe, the other end of the oil inlet bypass pipe is connected to the downstream of the oil inlet main pipe, and the first thermistor, the first heater and the second thermistor are sequentially arranged on the oil inlet bypass pipe along the flow direction of fuel oil;

and, the oil return pipe assembly still includes the oil return bypass pipe, the one end of oil return bypass pipe connect in the upper reaches that the oil return was responsible for, the other end of oil return bypass pipe connect in the low reaches that the oil return was responsible for, the fourth thermistor the second heater and the third thermistor set gradually in along fuel flow direction on the oil return bypass pipe.

As an optional technical scheme, the pipe diameter of the oil inlet bypass pipe is equal to that of the oil return bypass pipe.

In a second aspect, a fuel consumption detection system is provided, where the fuel consumption detection system includes a central controller and the vehicle-mounted fuel consumption meter as described above, and the central controller is configured to control the heating power of the first heater and the heating power of the second heater.

As an optional technical solution, the oil consumption detection system further includes a filter, and the filter is disposed between the oil tank and the oil inlet measurement unit.

In a third aspect, a measurement method is provided, which is applied to the above oil consumption detection system, and the measurement method includes the following steps:

step S100, controlling the heating power of the first heater and the heating power of the second heater through the central controller, so that the first heater heats the fuel oil flowing through the oil inlet pipe assembly at constant power and the second heater heats the fuel oil flowing through the oil return pipe assembly at constant power;

step S200, acquiring a first temperature difference delta 1 between the second thermistor and the first thermistor and acquiring a second temperature difference delta 2 between the third thermistor and the fourth thermistor;

step S300, enabling a temperature difference value delta 3 between the first temperature difference delta 1 and the second temperature difference delta 2 to be in direct proportion to a fuel flow rate difference value between the oil inlet pipe assembly and the oil return pipe assembly, and enabling the fuel flow rate difference value to serve as an actual instantaneous oil consumption value of the engine.

As an alternative solution, before the engine is started, the first temperature difference Δ 1 and the second temperature difference Δ 2 in step S200 are acquired;

if the first temperature difference Δ 1 is not equal to 0, adjusting a distance between the first thermistor and the first heater and a distance between the second thermistor and the first heater such that the distance between the first thermistor and the first heater is equal to the distance between the second thermistor and the first heater;

if the second temperature difference Δ 2 is not equal to 0, adjusting a distance between the fourth thermistor and the second heater and a distance between the third thermistor and the second heater such that the distance between the fourth thermistor and the second heater is equal to the distance between the third thermistor and the second heater.

The invention has the beneficial effects that:

the invention provides a vehicle-mounted oil consumption instrument, an oil consumption detection system and a measurement method, when an engine works, fuel oil flowing out of an oil tank flows into the engine through an oil inlet pipe assembly and an oil inlet pipe, the fuel oil sequentially passes through a first thermistor, a first heater and a second thermistor in the oil inlet pipe assembly, the first heater heats the fuel oil, the temperature of the fuel oil measured by the second thermistor is larger than that of the fuel oil measured by the first thermistor, a first temperature difference delta 1 between the second thermistor and the first thermistor is obtained, the first temperature difference delta 1 is in direct proportion to the flow rate value of the fuel oil of the oil inlet pipe assembly, the fuel oil flowing out of the engine flows back into the oil tank through an oil return pipe and an oil return pipe assembly, the fuel oil sequentially passes through a fourth thermistor, the second heater and a third thermistor in the oil return pipe assembly, the second heater heats the fuel oil, and the fuel temperature measured by the third thermistor is larger than the fuel temperature measured by the fourth thermistor, a second temperature difference delta 2 between the third thermistor and the fourth thermistor is obtained, the second temperature difference delta 2 is in direct proportion to the fuel flow rate value of the oil return pipe assembly, a temperature difference delta 3 between the first temperature difference delta 1 and the second temperature difference delta 2 is in direct proportion to the fuel flow rate difference between the oil inlet pipe assembly and the oil return pipe assembly, and the fuel flow rate difference is used as the actual instantaneous oil consumption value of the engine. In the test process, the actual flow velocity of an oil inlet pipe and the actual flow velocity of an oil return pipe of the engine do not need to be considered, the oil consumption value of the engine can be obtained only by measuring the flow velocity difference value of the oil inlet pipe and the oil return pipe, the flow velocity difference value can be reflected by the temperature difference value of the oil inlet pipe and the oil return pipe, and the fuel oil flow velocity difference value is used as the actual instantaneous oil consumption value of the engine accurately. In the invention, the fuel oil which flows back from the engine returns to the oil tank after flowing through the oil return measuring unit of the vehicle-mounted oil consumption instrument and is mixed with the residual fuel oil in the oil tank, so that the temperature of the fuel oil which enters the engine again is not too high, the normal operation of the engine is ensured, and the measuring precision of the vehicle-mounted oil consumption instrument is improved.

Drawings

The invention is explained in further detail below with reference to the figures and examples;

fig. 1 is a structural layout diagram of an oil consumption detection system according to an embodiment.

In the figure:

100. an oil tank; 200. an engine;

1. an oil inlet measuring unit; 11. an oil inlet main pipe; 12. an oil inlet by-pass pipe; 13. a first thermistor; 14. a second thermistor; 15. a first heater;

2. an oil return measurement unit; 21. an oil return main pipe; 22. an oil return bypass pipe; 23. a third thermistor; 24. a fourth thermistor; 25. a second heater;

3. a central controller;

4. and (3) a filter.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have a special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, the present embodiment provides a fuel consumption detecting system, which includes a vehicle-mounted fuel consumption meter, where the vehicle-mounted fuel consumption meter is disposed between a fuel tank 100 and an engine 200, the vehicle-mounted fuel consumption meter includes a fuel inlet measuring unit 1 and a fuel return measuring unit 2, the fuel inlet measuring unit 1 includes a fuel inlet pipe assembly, a first thermistor 13, a second thermistor 14 and a first heater 15, the fuel inlet pipe assembly is connected between the fuel tank 100 and a fuel inlet pipe of the engine 200, fuel flowing out of the fuel tank 100 flows into the engine 200 via the fuel inlet pipe assembly and the fuel inlet pipe, and the first thermistor 13, the first heater 15 and the second thermistor 14 are sequentially disposed on the fuel inlet pipe assembly along a flow direction of the fuel; the oil return measuring unit 2 includes an oil return pipe assembly, a third thermistor 23, a fourth thermistor 24 and a second heater 25, the oil return pipe assembly is connected between the oil tank 100 and an oil return pipe of the engine 200, the fuel oil flowing out of the engine 200 flows back into the oil tank 100 through the oil return pipe and the oil return pipe assembly, and the fourth thermistor 24, the second heater 25 and the third thermistor 23 are sequentially arranged on the oil return pipe assembly along the flow direction of the fuel oil.

Specifically, when the engine 200 works, the oil transfer pump of the engine 200 absorbs oil from an oil inlet of the engine, an oil inlet pipe of the engine 200 generates negative pressure, the higher the power of the engine 200 is, the stronger the oil absorption capacity is, and the higher the oil consumption is, the fuel oil flowing out of the oil tank 100 flows into the engine 200 through the oil inlet pipe assembly and the oil inlet pipe, the fuel oil sequentially passes through the first thermistor 13, the first heater 15 and the second thermistor 14 in the oil inlet pipe assembly, the first heater 15 heats the fuel oil, so that the fuel oil temperature measured by the second thermistor 14 is greater than the fuel oil temperature measured by the first thermistor 13, a first temperature difference Δ 1 between the second thermistor 14 and the first thermistor 13 is obtained, the first temperature difference Δ 1 is in direct proportion to the fuel oil flow rate value of the oil inlet pipe assembly, the fuel oil flowing out of the engine 200 flows back into the oil tank 100 through the oil return pipe and the oil return pipe assembly, the fuel oil sequentially passes through the fourth thermistor 24, the second heater 25 and the third thermistor 23 in the oil return pipe assembly, the second heater 25 heats the fuel oil, the fuel oil temperature measured by the third thermistor 23 is larger than the fuel oil temperature measured by the fourth thermistor 24, a second temperature difference delta 2 between the third thermistor 23 and the fourth thermistor 24 is obtained, the second temperature difference delta 2 is in direct proportion to the fuel oil flow rate value of the oil return pipe assembly, a temperature difference delta 3 between the first temperature difference delta 1 and the second temperature difference delta 2 is in direct proportion to the fuel oil flow rate difference between the oil inlet pipe assembly and the oil return pipe assembly, the fuel oil flow rate difference is used as an actual instantaneous fuel consumption value of the engine 200, and the fuel consumption value in unit time can be calculated according to the actual instantaneous fuel consumption value. In the measurement process, the actual flow rate of the oil inlet pipe and the actual flow rate of the oil return pipe of the engine 200 do not need to be considered, the oil consumption value of the engine 200 can be obtained only by measuring the flow rate difference value of the oil inlet pipe and the oil return pipe, the flow rate difference value can be reflected by the temperature difference value delta 3 of the oil inlet pipe and the oil return pipe, and the fuel oil flow rate difference value is used as the actual instantaneous oil consumption value of the engine 200 accurately. In the embodiment, the fuel oil returned by the engine 200 flows through the return oil measuring unit 2 of the vehicle fuel consumption meter and then returns to the fuel tank 100 to be mixed with the residual fuel oil in the fuel tank 100, so that the temperature of the fuel oil which enters the engine 200 again is not too high, thereby ensuring the normal operation of the engine 200 and improving the measurement accuracy of the vehicle fuel consumption meter.

When the engine 200 does not work or consumes little fuel, the values of the first temperature difference delta 1 and the second temperature difference delta 2 are small, and the temperature difference delta 3 between the first temperature difference delta 1 and the second temperature difference delta 2 is close to 0 or equal to 0; when the engine 200 is operated in a high-power state, the engine 200 consumes more fuel, at this time, the first temperature difference Δ 1 is larger, and the second temperature difference Δ 2 in the oil return pipe assembly is relatively smaller, so the temperature difference Δ 3 is also relatively higher, and at this time, the difference between the actual fuel flow rates of the corresponding oil inlet pipe assembly and the oil return pipe assembly is also larger, that is, it is stated that at this time, the engine 200 actually consumes more fuel.

The oil inlet pipe assembly and the oil return pipe assembly of the present embodiment are both made of a metal material.

The first thermistor 13, the second thermistor 14, the third thermistor 23, and the fourth thermistor 24 of the present embodiment are all positive temperature coefficient thermistors, and the positive temperature coefficient thermistors are sensor resistors, which are existing products, and the resistance value of the sensor resistors increases with the increase of temperature, so that the change of temperature can be reflected by the change of the resistance value.

In the present embodiment, the distance between the first thermistor 13 and the first heater 15 is equal to the distance between the second thermistor 14 and the first heater 15; and the distance between the fourth thermistor 24 and the second heater 25 is equal to the distance between the third thermistor 23 and the second heater 25.

Specifically, taking the oil inlet pipe assembly as an example, assuming that the fuel in the oil inlet pipe assembly does not flow, the first heater 15 heats the fuel, and since the distances from the first thermistor 13 and the second thermistor 14 to the first heater 15 are equal, the fuel temperatures measured by the first thermistor 13 and the second thermistor 14 are equal, when the engine 200 is started, the fuel in the oil inlet pipe assembly flows, the temperature measured by the second thermistor 14 is greater than the temperature measured by the first thermistor 13, that is, a first temperature difference Δ 1 is obtained, the first temperature difference Δ 1 is unrelated to the fuel temperature in the oil tank 100 and related to the fuel flow rate of the oil inlet pipe assembly, the greater the first temperature difference Δ 1 is, and in the oil return pipe assembly, the greater the temperature measured by the third thermistor 23 is than the temperature measured by the fourth thermistor 24, that is, the second temperature difference Δ 2 is obtained, and the second temperature difference delta 2 is independent of the temperature of the fuel returning from the engine 200 and is dependent on the fuel flow rate of the return duct assembly, the greater the fuel speed of the return duct assembly, the greater the second temperature difference delta 2. In practice, because the engine 200 consumes part of the fuel, the fuel speed of the oil return pipe assembly is slowed down, that is, the temperature difference Δ 3 is obtained, the temperature difference Δ 3 is in direct proportion to the fuel flow rate difference between the oil inlet pipe assembly and the oil return pipe assembly, and the fuel flow rate difference is used as the actual instantaneous oil consumption value of the engine 200. Since the first temperature difference Δ 1 is independent of the temperature of the fuel in the fuel tank 100, the fuel stored in the fuel tank 100 may be normal temperature fuel, for example, 20 degrees celsius or 25 degrees celsius, and the heating power of the first heater 15 is set to the first preset value, so that the heating speed of the fuel by the first heater 15 is kept at a slow level, that is, the fuel output from the fuel tank 100 is still in a normal temperature state after passing through the fuel inlet pipe assembly, so as to avoid the temperature of the fuel entering the engine 200 being too high.

In the present embodiment, the heating powers of the first heater 15 and the second heater 25 are equal.

In the present embodiment, the oil inlet pipe assembly includes an oil inlet main pipe 11, one end of the oil inlet main pipe 11 is communicated with the oil tank 100, the other end of the oil inlet main pipe 11 is communicated with the oil inlet pipe, and the pipe diameter of the oil inlet main pipe 11 is equal to that of the oil inlet pipe; and the oil return pipe assembly comprises an oil return main pipe 21, one end of the oil return main pipe 21 is communicated with the oil tank 100, the other end of the oil return main pipe 21 is communicated with the oil return pipe, and the pipe diameter of the oil return main pipe 21 is equal to that of the oil return pipe. The pipe diameter of the oil inlet main pipe 11 is equal to that of the oil inlet pipe, the pipe diameter of the oil return main pipe 21 is equal to that of the oil return pipe, the vehicle-mounted oil consumption instrument is connected between the oil tank 100 and the engine 200, system pressure cannot be affected, the working state of the engine 200 is basically consistent when the vehicle-mounted oil consumption instrument is connected and the vehicle-mounted oil consumption instrument is not connected, and reliability of measured values is guaranteed.

In this embodiment, the pipe diameter of the oil inlet main pipe 11 is equal to the pipe diameter of the oil return main pipe 21, so that the system resistance characteristic is consistent with the state of the engine 200 when the engine is not tested, and the fluctuation of the measured value is reduced.

In this embodiment, the oil inlet pipe assembly further includes an oil inlet bypass pipe 12, one end of the oil inlet bypass pipe 12 is connected to the upstream of the oil inlet main pipe 11, the other end of the oil inlet bypass pipe 12 is connected to the downstream of the oil inlet main pipe 11, and the first thermistor 13, the first heater 15 and the second thermistor 14 are sequentially disposed on the oil inlet bypass pipe 12 along the flow direction of the fuel oil; and the oil return pipe assembly further comprises an oil return bypass pipe 22, one end of the oil return bypass pipe 22 is connected to the upstream of the oil return main pipe 21, the other end of the oil return bypass pipe 22 is connected to the downstream of the oil return main pipe 21, and the fourth thermistor 24, the second heater 25 and the third thermistor 23 are sequentially arranged on the oil return bypass pipe 22 along the flowing direction of the fuel oil. The main oil inlet pipe 11 is used as main oil inlet flow, the bypass oil inlet pipe 12 is used as branch oil inlet flow, most of the fuel oil flowing out of the oil tank 100 enters the engine 200 through the main oil inlet pipe 11, the blocking of the first thermistor 13, the first heater 15 and the second thermistor 14 to the fuel oil is reduced, the resistance of the oil inlet flow is reduced, the rest of the fuel oil flowing out of the oil tank 100 enters the engine 200 through the bypass oil inlet pipe 12, and the first temperature difference delta 1 is measured by the first thermistor 13, the first heater 15 and the second thermistor 14 in the bypass oil inlet pipe 12. Similarly, the main oil return pipe 21 serves as a main oil return flow, the bypass oil inlet pipe 12 serves as a branch oil return flow, most of the fuel oil flowing out of the engine 200 flows back to the oil tank 100 through the main oil return pipe 21, the blockage of the fourth thermistor 24, the second heater 25 and the third thermistor 23 to the fuel oil is reduced, the oil return resistance is reduced, the rest of the fuel oil flowing out of the engine 200 flows back to the oil tank 100 through the bypass oil return pipe 22, and the second temperature difference Δ 2 is measured by the fourth thermistor 24, the second heater 25 and the third thermistor 23 in the bypass oil return pipe 22.

In other embodiments, when both the oil inlet speed and the oil return speed of the engine 200 are slow, the oil inlet bypass pipe 12 and the oil return bypass pipe 22 are not used, the first thermistor 13, the first heater 15, and the second thermistor 14 are sequentially disposed on the oil inlet main pipe 11 in the flow direction of the fuel, and the fourth thermistor 24, the second heater 25, and the third thermistor 23 are sequentially disposed on the oil return main pipe 21 in the flow direction of the fuel, even if the oil consumption of the engine 200 is low, although the flow speed of the fuel in the oil inlet main pipe 11 is slow and at least in a flowing state, the first temperature difference Δ 1 can be measured by the first thermistor 13, the first heater 15, and the second thermistor 14 disposed on the oil inlet main pipe 11, but when the oil inlet speed is slow, if the oil inlet bypass pipe 12 is disposed and used, the flow speed of the fuel in the oil inlet main pipe 11 is further reduced, the first temperature difference Δ 1 is close to 0 and no effective measurement can be made. When the oil intake speed is slow and the consumption of the engine 200 is performed, the oil return speed is further reduced, the second temperature difference Δ 2 is infinitely close to 0, and if the fourth thermistor 24, the second heater 25, and the third thermistor 23 are not disposed on the oil return main pipe 21, the second temperature difference Δ 2 may be made larger, so that the temperature difference Δ 3 between the first temperature difference Δ 1 and the second temperature difference Δ 2 is higher, which is not in accordance with the actual situation.

In the present embodiment, the pipe diameter of the oil inlet bypass pipe 12 is equal to the pipe diameter of the return bypass pipe 22.

Optionally, the pipe diameter of the oil inlet main pipe 11 is larger than that of the oil inlet bypass pipe 12, and the pipe diameter of the oil return main pipe 21 is larger than that of the oil return bypass pipe 22.

The fuel consumption detection system of the present embodiment further includes a central controller 3, and the central controller 3 is configured to control the heating power of the first heater 15 and the heating power of the second heater 25. The central controller 3 controls the first heater 15 and the second heater 25 to constantly heat the fuel at the same power.

In this embodiment, the oil consumption detection system further includes a filter 4, the filter 4 is disposed between the oil tank 100 and the oil inlet measurement unit 1, and the filter 4 is configured to remove impurities doped in the fuel oil output by the oil tank 100, so as to reduce interference on the measurement result.

The embodiment also provides a measurement method applied to the oil consumption detection system, and the measurement method includes the following steps:

step S100, controlling the heating power of the first heater 15 and the heating power of the second heater 25 through the central controller 3, so that the first heater 15 heats the fuel oil flowing through the oil inlet pipe assembly at constant power, and the second heater 25 heats the fuel oil flowing through the oil return pipe assembly at constant power;

step S200, acquiring a first temperature difference Δ 1 between the second thermistor 14 and the first thermistor 13, and acquiring a second temperature difference Δ 2 between the third thermistor 23 and the fourth thermistor 24;

step S300, a temperature difference Δ 3 between the first temperature difference Δ 1 and the second temperature difference Δ 2 is proportional to a fuel flow rate difference between the oil inlet pipe assembly and the oil return pipe assembly, and the fuel flow rate difference is used as an actual instantaneous oil consumption value of the engine 200.

In the present embodiment, before the engine 200 is started, the first temperature difference Δ 1 and the second temperature difference Δ 2 in step S200 are acquired;

if the first temperature difference Δ 1 is not equal to 0, adjusting the distance between the first thermistor 13 and the first heater 15 and the distance between the second thermistor 14 and the first heater 15 such that the distance between the first thermistor 13 and the first heater 15 is equal to the distance between the second thermistor 14 and the first heater 15;

if the second temperature difference Δ 2 is not equal to 0, the distance between the fourth thermistor 24 and the second heater 25 and the distance between the third thermistor 23 and the second heater 25 are adjusted such that the distance between the fourth thermistor 24 and the second heater 25 is equal to the distance between the third thermistor 23 and the second heater 25.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. An on-vehicle oil consumption appearance sets up between oil tank (100) and engine (200), its characterized in that, on-vehicle oil consumption appearance includes:

the fuel inlet measuring unit (1) comprises a fuel inlet pipe assembly, a first thermistor (13), a second thermistor (14) and a first heater (15), the fuel inlet pipe assembly is connected between the fuel tank (100) and an oil inlet pipe of the engine (200), fuel flowing out of the fuel tank (100) flows into the engine (200) through the fuel inlet pipe assembly and the oil inlet pipe, and the first thermistor (13), the first heater (15) and the second thermistor (14) are sequentially arranged on the fuel inlet pipe assembly along the flow direction of the fuel;

oil return measuring unit (2), oil return measuring unit (2) is including returning oil pipe subassembly, third thermistor (23), fourth thermistor (24) and second heater (25), oil return pipe assembly connect in oil tank (100) with between the oil return pipe of engine (200), the fuel that engine (200) flowed out via return oil pipe and the oil return pipe subassembly backward flow extremely in oil tank (100), fourth thermistor (24) second heater (25) and third thermistor (23) set gradually in along the fuel flow direction on the oil return pipe subassembly.

2. The vehicle fuel consumption meter according to claim 1, characterized in that the distance between the first thermistor (13) and the first heater (15) is equal to the distance between the second thermistor (14) and the first heater (15);

and the distance between the fourth thermistor (24) and the second heater (25) is equal to the distance between the third thermistor (23) and the second heater (25).

3. The vehicle fuel consumption meter according to claim 1, wherein the fuel inlet pipe assembly comprises a fuel inlet main pipe (11), one end of the fuel inlet main pipe (11) is communicated with the fuel tank (100), the other end of the fuel inlet main pipe (11) is communicated with the fuel inlet pipe, and the pipe diameter of the fuel inlet main pipe (11) is equal to that of the fuel inlet pipe;

and, it includes that the oil return is responsible for (21) to return the oil pipe subassembly, the oil return be responsible for (21) one end with oil tank (100) intercommunication, the oil return be responsible for (21) the other end with return the oil pipe intercommunication, the oil return be responsible for (21) the pipe diameter with the pipe diameter that returns the oil pipe equals.

4. The vehicle fuel consumption meter according to claim 3, wherein the pipe diameter of the fuel inlet main pipe (11) is equal to the pipe diameter of the fuel return main pipe (21).

5. The vehicle fuel consumption meter according to claim 3, wherein the fuel inlet pipe assembly further comprises a fuel inlet bypass pipe (12), one end of the fuel inlet bypass pipe (12) is connected to the upstream of the fuel inlet main pipe (11), the other end of the fuel inlet bypass pipe (12) is connected to the downstream of the fuel inlet main pipe (11), and the first thermistor (13), the first heater (15) and the second thermistor (14) are sequentially arranged on the fuel inlet bypass pipe (12) along the flow direction of fuel;

and, the oil return pipe assembly still includes oil return bypass pipe (22), the one end of oil return bypass pipe (22) connect in the upper reaches of being responsible for (21) of oil return, the other end of oil return bypass pipe (22) connect in the lower reaches of being responsible for (21) of oil return, fourth thermistor (24) second heater (25) and third thermistor (23) set gradually along the flow direction of fuel on oil return bypass pipe (22).

6. The vehicle fuel consumption meter according to claim 5, wherein the pipe diameter of the oil inlet bypass pipe (12) is equal to the pipe diameter of the oil return bypass pipe (22).

7. A fuel consumption detection system, characterized in that the fuel consumption detection system comprises a central controller (3) and an on-board fuel consumption meter according to any one of claims 1-6, the central controller (3) being configured to control the heating power of the first heater (15) and the heating power of the second heater (25).

8. The fuel consumption detection system according to claim 7, further comprising a filter (4), wherein the filter (4) is disposed between the fuel tank (100) and the fuel inlet measurement unit (1).

9. A measurement method applied to the fuel consumption detection system according to claim 7 or 8, characterized by comprising the steps of:

step S100, controlling the heating power of the first heater (15) and the heating power of the second heater (25) through the central controller (3), so that the first heater (15) heats the fuel oil flowing through the oil inlet pipe assembly at constant power, and the second heater (25) heats the fuel oil flowing through the oil return pipe assembly at constant power;

step S200, acquiring a first temperature difference delta 1 between the second thermistor (14) and the first thermistor (13), and acquiring a second temperature difference delta 2 between the third thermistor (23) and the fourth thermistor (24);

step S300, a temperature difference value delta 3 between the first temperature difference delta 1 and the second temperature difference delta 2 is in direct proportion to a fuel flow rate difference value between the oil inlet pipe assembly and the oil return pipe assembly, and the fuel flow rate difference value is used as an actual instantaneous oil consumption value of the engine (200).

10. The measurement method according to claim 9, characterized in that, before the engine (200) is started, the first temperature difference Δ 1 and the second temperature difference Δ 2 in the step S200 are acquired;

if the first temperature difference Δ 1 is not equal to 0, adjusting the distance between the first thermistor (13) and the first heater (15) and the distance between the second thermistor (14) and the first heater (15) such that the distance between the first thermistor (13) and the first heater (15) is equal to the distance between the second thermistor (14) and the first heater (15);

if the second temperature difference Δ 2 is not equal to 0, the distance between the fourth thermistor (24) and the second heater (25) and the distance between the third thermistor (23) and the second heater (25) are adjusted such that the distance between the fourth thermistor (24) and the second heater (25) is equal to the distance between the third thermistor (23) and the second heater (25).

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