An anti-explosion diesel engine smoke control system and method

Abstract

The present application relates to a kind of anti-explosion diesel engine smoke control system and method, system includes: data acquisition unit, for the rotating speed data of anti-explosion diesel engine, intake pressure data, cooling water temperature data, intake temperature data and atmospheric pressure data;Data processing unit is used to calculate the intake flow data of anti-explosion diesel engine according to rotating speed data, intake pressure data and intake temperature data, stroke intake volume and air-fuel ratio limit;According to rotating speed data, stroke intake volume and air-fuel ratio limit, calculate smoke limit oil quantity;According to smoke limit oil quantity, calculate the injection pulse width of anti-explosion diesel engine;Injection control unit is used to output valve control signal according to injection pulse width;Injection control valve is used to change the opening and closing state of itself under the control of valve control signal, to control the injection quantity of anti-explosion diesel engine;The present application can effectively prevent anti-explosion diesel engine from appearing smoke phenomenon.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion-proof diesel engines, in particular to an explosion-proof diesel engine smoke control system and method. BACKGROUND

[0002] The explosion-proof diesel engine has become the core power source of the auxiliary transportation equipment in coal mines due to its excellent power performance and outstanding mobility. With the continuous expansion of coal mine construction, the application range of the explosion-proof diesel engine is also increasingly wide. However, the ventilation conditions in the coal mine are often poor, and once the explosion-proof diesel engine emission is abnormal, it will seriously threaten the physical and mental health of the underground workers.

[0003] Under certain working conditions, such as diesel engine rapid acceleration, low atmospheric pressure, and blocked intake system, the diesel engine may have insufficient intake. At this time, due to excessive fuel injection, the combustion efficiency will decrease, the emission condition will deteriorate, and the smoke phenomenon will occur. SUMMARY

[0004] In order to solve the technical problems in the prior art that excessive fuel injection of the explosion-proof diesel engine leads to decreased combustion efficiency, deteriorated emission condition, and occurrence of smoke phenomenon, the present application provides an explosion-proof diesel engine smoke control system and method.

[0005] The technical solution of the present application to solve the above technical problems is as follows:

[0006] An explosion-proof diesel engine smoke control system for preventing abnormal smoke phenomenon of the explosion-proof diesel engine, comprising:

[0007] A data acquisition unit for acquiring rotation speed data, intake supercharging pressure data, cooling water temperature data, intake temperature data, and atmospheric pressure data of the explosion-proof diesel engine;

[0008] A data processing unit for calculating intake flow data of the explosion-proof diesel engine according to the rotation speed data, the intake supercharging pressure data, and the intake temperature data; calculating stroke intake amount according to the intake flow data, the rotation speed data, the number of cylinders of the explosion-proof diesel engine, and the number of strokes of the explosion-proof diesel engine; wherein the stroke intake amount is the intake flow of the cylinder of the explosion-proof diesel engine in one stroke; calculating air-fuel ratio limit value according to the intake supercharging pressure data, the intake temperature data, the rotation speed data, the cooling water temperature data, and the atmospheric pressure data; calculating smoke limiting oil amount according to the rotation speed data, the stroke intake amount, and the air-fuel ratio limit value; and calculating fuel injection pulse width of the explosion-proof diesel engine according to the smoke limiting oil amount;

[0009] A fuel injection control unit for outputting a valve control signal according to the fuel injection pulse width;

[0010] The oil injection control valve is used for changing its opening and closing state under the control of the valve control signal, thereby controlling the oil injection amount of the explosion-proof diesel engine.

[0011] The present application has the beneficial effect that the smoke limiting oil amount is calculated by collecting the rotation speed data, the intake supercharging pressure data, the cooling water temperature data, the intake temperature data and the atmospheric pressure data of the explosion-proof diesel engine, and the oil injection control valve is controlled by the smoke limiting oil amount, so as to prevent the explosion-proof diesel engine from appearing smoke phenomenon by accurately controlling the oil injection limiting amount when the explosion-proof diesel engine appears excessive oil injection amount.

[0012] On the basis of the above technical solution, the present application can be further improved as follows.

[0013] Further, the data processing unit is specifically configured to construct an air flow table and an intake temperature correction table; wherein the air flow table is a two-dimensional table, the rows of the air flow table represent the rotation speed data, the columns of the air flow table represent the intake supercharging pressure data, and the domains of the air flow table represent the intake flow basic data; the intake temperature correction table is a one-dimensional table, the rows of the intake temperature correction table represent the intake temperature data, and the domains of the intake temperature correction table represent temperature correction coefficients;

[0014] The data processing unit is further specifically configured to query the air flow table according to the rotation speed data and the intake supercharging pressure data to obtain the intake flow basic data corresponding to the rotation speed data and the intake supercharging pressure data; query the intake temperature correction table according to the intake temperature data to obtain the temperature correction coefficient corresponding to the intake temperature data; and calculate the intake flow data according to the intake flow basic data and the temperature correction coefficient.

[0015] Further, the data processing unit is further specifically configured to preset a plurality of different rotation speed data and a plurality of different intake supercharging pressure data.

[0016] The data acquisition unit is specifically configured to acquire the theoretical intake amount of the explosion-proof diesel engine under a plurality of different rotation speed data respectively, and correspondingly obtain a plurality of theoretical intake amounts.

[0017] The data processing unit is further specifically configured to calculate the charge efficiency corresponding to each rotation speed data by using each rotation speed data and the corresponding theoretical intake amount, and correspondingly obtain a plurality of charge efficiencies.

[0018] The data acquisition unit is further specifically configured to acquire the intake temperature of the explosion-proof diesel engine under any rotation speed data and any intake supercharging pressure data, and correspondingly obtain a plurality of intake temperature data.

[0019] The data processing unit is further configured to calculate air density by using any of the rotation speed data, any of the intake boost pressure data and the corresponding intake temperature data, and obtain multiple air density data; calculate the intake flow of the explosion-proof diesel engine under the combination of any of the rotation speed data and any of the intake boost pressure data according to any of the rotation speed data, the corresponding charge efficiency, the corresponding air density data and the displacement of the explosion-proof diesel engine, and obtain multiple intake flow basic data.

[0020] Further, the data acquisition unit is further configured to acquire the intake flow of the explosion-proof diesel engine under the corresponding rotation speed data at each of the intake temperature data by using the gas flow meter, and obtain multiple actual intake flow data.

[0021] The data processing unit is further configured to calculate the temperature correction coefficient corresponding to each of the intake temperature data according to the corresponding intake flow basic data and the actual intake flow data of each of the intake temperature data.

[0022] Further, the data processing unit is further configured to obtain the intake flow data by multiplying the intake flow basic data and the temperature correction coefficient.

[0023] Further, the data processing unit is further configured to obtain a first product value by multiplying the intake flow data and the number of strokes of the explosion-proof diesel engine, obtain a second product value by multiplying the rotation speed data and the number of cylinders of the explosion-proof diesel engine, obtain a third product value by multiplying the second product value by 2, and obtain the stroke intake amount by dividing the first product value by the third product value.

[0024] The data processing unit is also specifically configured to construct an air-fuel ratio limit value basic mapping table, a water temperature correction offset table, a water temperature correction coefficient mapping table, an atmospheric pressure correction offset mapping table, and an atmospheric pressure correction coefficient mapping table; wherein the air-fuel ratio limit value basic mapping table, the water temperature correction offset table, the atmospheric pressure correction offset mapping table, and the atmospheric pressure correction coefficient mapping table are two-dimensional tables, and the water temperature correction coefficient mapping table is a one-dimensional table; the rows of the air-fuel ratio limit value basic mapping table represent the rotation speed data, the columns of the air-fuel ratio limit value basic mapping table represent the intake supercharging pressure data, and the domains of the air-fuel ratio limit value basic mapping table represent air-fuel ratio limit value basic values; the rows of the water temperature correction offset table represent the rotation speed data, the columns of the water temperature correction offset table represent the intake supercharging pressure data, and the domains of the water temperature correction offset table represent water temperature correction offset values; the rows of the water temperature correction coefficient mapping table represent the cooling water temperature data, and the domains of the water temperature correction coefficient mapping table represent water temperature correction coefficients; the rows of the atmospheric pressure correction offset mapping table represent the rotation speed data, the columns of the atmospheric pressure correction offset mapping table represent the intake supercharging pressure data, and the domains of the atmospheric pressure correction offset mapping table represent atmospheric pressure correction offset values; and the rows of the atmospheric pressure correction coefficient mapping table represent the cooling water temperature data, the columns of the atmospheric pressure correction coefficient mapping table represent the intake supercharging pressure data, and the domains of the atmospheric pressure correction coefficient mapping table represent atmospheric pressure correction coefficients.

[0025] The data processing unit is also specifically configured to query, in the air-fuel ratio limit value basic mapping table, the air-fuel ratio limit value basic value corresponding to the combination of the rotation speed data and the intake supercharging pressure data; query, in the water temperature correction offset table, the water temperature correction offset value corresponding to the combination of the rotation speed data and the intake supercharging pressure data; query, in the water temperature correction coefficient mapping table, the water temperature correction coefficient corresponding to the cooling water temperature data; query, in the atmospheric pressure correction offset mapping table, the atmospheric pressure correction offset value corresponding to the combination of the rotation speed data and the intake supercharging pressure data; and query, in the atmospheric pressure correction coefficient mapping table, the atmospheric pressure correction coefficient corresponding to the combination of the cooling water temperature data and the intake supercharging pressure data.

[0026] The data processing unit is also specifically configured to calculate the air-fuel ratio limit value by using the air-fuel ratio limit value basic value, the water temperature correction offset value, the water temperature correction coefficient, the atmospheric pressure correction offset value, and the atmospheric pressure correction coefficient.

[0027] Further, the data processing unit is also specifically configured to obtain the smoke-limiting oil amount by dividing the stroke intake amount by the air-fuel ratio limit value.

[0028] Furthermore, the data processing unit is specifically used to construct a fuel quantity pulse width mapping table; wherein the fuel quantity pulse width mapping table is a two-dimensional table, the rows of the fuel quantity pulse width mapping table represent the speed data, the columns of the fuel quantity pulse width mapping table represent the smoke-limiting fuel quantity, and the fields of the fuel quantity pulse width mapping table represent the fuel injection pulse width.

[0029] The data processing unit is also specifically used to query the injection pulse width under the combination of the smoke-limiting fuel quantity and the rotation speed data in the fuel quantity pulse width mapping table.

[0030] To address the aforementioned technical issues, this invention also provides a method for controlling smoke emission from an explosion-proof diesel engine, the specific technical solution of which is as follows:

[0031] A method for controlling smoke from an explosion-proof diesel engine, applied to the aforementioned smoke control system for an explosion-proof diesel engine, includes the following steps:

[0032] The data acquisition unit collects data on the speed, intake boost pressure, coolant temperature, gear position, intake air temperature, and atmospheric pressure of the explosion-proof diesel engine.

[0033] The data processing unit calculates the intake air flow rate data of the explosion-proof diesel engine based on the rotational speed data, the intake boost pressure data, and the intake air temperature data.

[0034] The data processing unit calculates the stroke intake volume based on the intake flow data, the rotational speed data, the number of cylinders of the explosion-proof diesel engine, and the number of strokes of the explosion-proof diesel engine; wherein, the stroke intake volume is the intake flow rate of a cylinder of the explosion-proof diesel engine in one stroke.

[0035] The air-fuel ratio limit is calculated using the data processing unit based on the intake boost pressure data, the intake temperature data, the engine speed data, the coolant temperature data, and the atmospheric pressure data.

[0036] The data processing unit calculates the smoke-limiting fuel quantity based on the rotational speed data, the stroke intake air volume, and the air-fuel ratio limit; and calculates the injection pulse width of the explosion-proof diesel engine based on the smoke-limiting fuel quantity.

[0037] The fuel injection control unit outputs a valve control signal based on the fuel injection pulse width.

[0038] The fuel injection control valve changes its on / off state under the control of the valve control signal, thereby controlling the fuel injection quantity of the explosion-proof diesel engine. Attached Figure Description

[0039] Figure 1 This is a structural block diagram of an explosion-proof diesel engine smoke control system according to an embodiment of the present invention;

[0040] Figure 2 A flow chart for calculating the intake flow data of the explosion-proof diesel engine in the embodiment of the present application is shown in the figure.

[0041] Figure 3 A flow chart for calculating the air-fuel ratio limit value in the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0042] The principles and features of the present application are described below in conjunction with the accompanying drawings, which are only used to explain the present application and not intended to limit the scope of the present application.

[0043] As shown in the figure, the embodiment provides a smoke control system for explosion-proof diesel engine for preventing abnormal smoke phenomenon of the explosion-proof diesel engine, which comprises: Figure 1 A data acquisition unit is configured to acquire rotation speed data, intake boost pressure data, cooling water temperature data, intake temperature data and atmospheric pressure data of the explosion-proof diesel engine; wherein the data acquisition unit comprises a rotation speed sensor, a boost pressure sensor, an atmospheric pressure sensor, a water temperature sensor and an intake temperature sensor; the boost pressure sensor and the atmospheric pressure sensor are both intrinsically safe pressure sensors; the boost pressure sensor is of GPD1.0 type and the atmospheric pressure sensor is of GPD0.35 type; the water temperature sensor and the intake temperature sensor are both intrinsically safe temperature sensors; the intake temperature sensor is of WD150 type and the water temperature sensor is of GWD200 type; and the rotation speed sensor is a mine intrinsically safe crankshaft sensor (GSH5000 type) or a cam rotation speed sensor (GSH2500 type).

[0044] The rotation speed sensor is configured to acquire the rotation speed data; the boost pressure sensor is configured to acquire the intake boost pressure data; the intake temperature sensor is configured to acquire the intake temperature data; the atmospheric pressure sensor is configured to acquire the atmospheric pressure data; and the water temperature sensor is configured to acquire the cooling water temperature data.

[0045]

[0046] ​A data processing unit is configured to calculate intake flow data of the explosion-proof diesel engine according to the rotation speed data, the intake supercharging pressure data and the intake temperature data; calculate stroke intake volume according to the intake flow data, the rotation speed data, the number of cylinders of the explosion-proof diesel engine and the number of strokes of the explosion-proof diesel engine; wherein the stroke intake volume is the intake flow of the cylinder of the explosion-proof diesel engine in one stroke; calculate air-fuel ratio limit value according to the intake supercharging pressure data, the intake temperature data, the rotation speed data, the cooling water temperature data and the atmospheric pressure data; calculate smoke-limiting oil amount according to the rotation speed data, the stroke intake volume and the air-fuel ratio limit value; calculate the fuel injection pulse width of the explosion-proof diesel engine according to the smoke-limiting oil amount; wherein the data processing unit further comprises a memory and a calculator; wherein the memory is configured to store the rotation speed data, the intake supercharging pressure data, the cooling water temperature data, the intake temperature data and the atmospheric pressure data; and the calculator is preferably an MCU or a vehicle ECU.

[0047] A fuel injection control unit is configured to output a valve control signal according to the fuel injection pulse width.

[0048] A fuel injection control valve is configured to change its on-off state under the control of the valve control signal, thereby controlling the fuel injection amount of the explosion-proof diesel engine.

[0049] In some embodiments, the data processing unit is specifically configured to construct an air flow table and an intake temperature correction table; wherein the air flow table is a two-dimensional table, the rows of the air flow table represent the rotation speed data, the columns of the air flow table represent the intake supercharging pressure data, and the domains of the air flow table represent the intake flow basic data; the intake temperature correction table is a one-dimensional table, the rows of the intake temperature correction table represent the intake temperature data, and the domains of the intake temperature correction table represent temperature correction coefficients; wherein the air flow table is shown in Table 1, and the intake temperature correction table is shown in Table 2.

[0050] Table 1 Air flow table

[0051]

[0052]

[0053] Table 2 Intake temperature correction table

[0054] -20 -10 0 10 20 30 40 50 60 70 80 90 100 k 1.24 1.19 1.15 1.11 1.07 1.03 1 0.97 0.94 0.91 0.89 0.86 0.84

[0055] The rotation speed and the intake supercharging pressure are obtained by acquisition, the initial value of the intake flow is obtained by querying Table 1, for example, the current rotation speed is 1000 rpm, the supercharging pressure is 120 kpa, and the initial value of the intake flow obtained by table lookup is 120; if the current rotation speed is 1150 rpm and the supercharging pressure is 125 kpa.

[0056] When the rotation speed and the intake supercharging pressure are not in Table 1, i.e. corresponding rotation speed data and intake supercharging pressure data are not queried in Table 1, the intake flow rate basic data corresponding to the rotation speed data and the intake supercharging pressure data combination is calculated by an interpolation algorithm. The linear interpolation algorithm is as follows:

[0057] First step: according to the coordinates (Y1, M11), (Y2, M12), calculate the interpolation MX1 according to the known intake supercharging pressure Y. Y1 and Y2 respectively represent two values adjacent to the intake supercharging pressure data in Table 1; M11 and M12 respectively represent two values adjacent to the rotation speed data in Table 1.

[0058] MX1 = (M12 - M11) * (Y - Y1) / (Y2 - Y1) + M11.

[0059] Second step: according to the coordinates (Y1, M21), (Y2, M22), calculate the interpolation MX1 according to the known supercharging pressure Y.

[0060] MX2 = (M22 - M21) * (Y - Y1) / (Y2 - Y1) + M21.

[0061] Second step: according to the coordinates (X1, MX1), (X2, MX2), calculate the interpolation MY according to the known rotation speed X.

[0062] MY = (MX2 - MX1) * (X - X1) / (X2 - X1) + MX1.

[0063] As shown in Table 1: X1 is 1000, X2 is 1200, Y1 is 110, Y2 is 120; M11 is 120, M12 is 155, M21 is 150, M22 is 185;

[0064] MX1 = (M12 - M11) * (Y - Y1) / (Y2 - Y1) + M11.

[0065] = (155 - 120) * (125 - 120) / (130 - 120) + 120

[0066] = 137.5;

[0067] MX2 = (M22 - M21) * (Y - Y1) / (Y2 - Y1) + M21.

[0068] = (185 - 150) * (125 - 120) / (130 - 120) + 150

[0069] = 167.5;

[0070] MY = (MX2 - MX1) * (X - XI) / (X2 - XI) + MX1.

[0071] = (167.5 - 137.5) * (1150 - 1000) / (1200 - 1000) + 137.5

[0072] = 160;

[0073] That is, when the intake pressure boost data is 125, the intake flow basic data is 137.5 when the speed data is 1000; the intake flow basic data is 160 when the speed data is 1150; the intake flow basic data is 167.5 when the speed data is 1200.

[0074] Similarly, when the intake temperature data corresponding to the temperature correction coefficient cannot be directly queried in Table 2, the corresponding temperature correction coefficient is also calculated by using the interpolation algorithm.

[0075] In some embodiments, as shown in Figure 2 the method for calculating the stroke intake amount according to the intake flow data, the speed data, the number of cylinders of the explosion-proof diesel engine, and the number of strokes of the explosion-proof diesel engine is as follows:

[0076] The data processing unit queries the air flow table according to the speed data and the intake pressure boost data to obtain the intake flow basic data corresponding to the speed data and the intake pressure boost data; queries the intake temperature correction table according to the intake temperature data to obtain the temperature correction coefficient corresponding to the intake temperature data; and calculates the intake flow data according to the intake flow basic data and the temperature correction coefficient.

[0077] The data processing unit presets a plurality of different speed data and a plurality of different intake pressure boost data; and the data acquisition unit is specifically configured to acquire the theoretical intake amount of the explosion-proof diesel engine under a plurality of different speed data respectively, to obtain a plurality of theoretical intake amounts correspondingly.

[0078] The data processing unit calculates the charge efficiency corresponding to each speed data by using each speed data and the corresponding theoretical intake amount, to obtain a plurality of charge efficiencies correspondingly.

[0079] The data acquisition unit acquires the intake temperature of the explosion-proof diesel engine under any speed data and any intake pressure boost data, to obtain a plurality of intake temperature data correspondingly.

[0080] The data processing unit calculates the air density by using any of the rotation speed data, any of the intake boost pressure data and the corresponding intake temperature data, and obtains multiple air density data; calculates the intake flow of the explosion-proof diesel engine under the combination of any of the rotation speed data and any of the intake boost pressure data according to any of the rotation speed data, the corresponding charge efficiency, the corresponding air density data and the displacement of the explosion-proof diesel engine, and obtains multiple intake flow basic data.

[0081] The data acquisition unit also acquires the intake flow of the explosion-proof diesel engine under the corresponding rotation speed data of each intake temperature data by using the gas flow meter, and obtains multiple actual intake flow data;

[0082] The data processing unit calculates the temperature correction coefficient corresponding to each intake temperature data according to the corresponding intake flow basic data and the actual intake flow data of each intake temperature data.

[0083] The data processing unit obtains the intake flow data by multiplying the intake flow basic data and the temperature correction coefficient.

[0084] The construction steps of the air flow table and the intake temperature correction table are as follows:

[0085] The data of the intake flow table is obtained through bench test of the diesel engine and formula calculation.

[0086] First step: bench test. The actual air flow (Ma) at each rotation speed point is tested by the gas flow meter.

[0087] Second step: calculation of parameters.

[0088] The charge efficiency η of the engine at each rotation speed point is calculated by using the known engine parameters (theoretical intake amount Ms of the engine).

[0089] The air density ρ (kg / m3) and the air flow W (kg / h) under the current condition are calculated by using the acquired data: rotation speed EngineSpeed (rpm), boost pressure BoostPress (kpa) and intake temperature InletAirTemp (℃).

[0090] ρ = (BoostPress * 1000) / (287.1 * (273 + InletAirTemp)).

[0091] The intake flow is calculated by combining the engine parameters and the engine displacement V (L).

[0092] W = η * ρ * EngineSpeed * V * 30 / 1000.

[0093] Perfecting the intake flow meter.

[0094] The air temperature correction table is calculated by using the calculated intake flow and the actual air flow.

[0095] In some embodiments, the data processing unit is further configured to obtain a first product value by multiplying the intake flow data by the number of strokes of the explosion-proof diesel engine, obtain a second product value by multiplying the rotation speed data by the number of cylinders of the explosion-proof diesel engine, obtain a third product value by multiplying the second product value by 2, and obtain the stroke intake amount by dividing the first product value by the third product value.

[0096] The data processing unit is further configured to construct an air-fuel ratio limit value basic mapping table, a water temperature correction offset table, a water temperature correction coefficient mapping table, an atmospheric pressure correction offset mapping table, and an atmospheric pressure correction coefficient mapping table; wherein the air-fuel ratio limit value basic mapping table, the water temperature correction offset table, the atmospheric pressure correction offset mapping table, and the atmospheric pressure correction coefficient mapping table are two-dimensional tables, and the water temperature correction coefficient mapping table is a one-dimensional table; the rows of the air-fuel ratio limit value basic mapping table represent the rotation speed data, the columns of the air-fuel ratio limit value basic mapping table represent the intake boost pressure data, and the domains of the air-fuel ratio limit value basic mapping table represent air-fuel ratio limit value basic values; the rows of the water temperature correction offset table represent the rotation speed data, the columns of the water temperature correction offset table represent the intake boost pressure data, and the domains of the water temperature correction offset table represent water temperature correction offset values; the rows of the water temperature correction coefficient mapping table represent the cooling water temperature data, and the domains of the water temperature correction coefficient mapping table represent water temperature correction coefficients; the rows of the atmospheric pressure correction offset mapping table represent the rotation speed data, the columns of the atmospheric pressure correction offset mapping table represent the intake boost pressure data, and the domains of the atmospheric pressure correction offset mapping table represent atmospheric pressure correction offset values; the rows of the atmospheric pressure correction coefficient mapping table represent the cooling water temperature data, the columns of the atmospheric pressure correction coefficient mapping table represent the intake boost pressure data, and the domains of the atmospheric pressure correction coefficient mapping table represent atmospheric pressure correction coefficients.

[0097] The air-fuel ratio limit value basic mapping table is shown in Table 3, the water temperature correction offset mapping table is shown in Table 4, the water temperature correction coefficient mapping table is shown in Table 5, the atmospheric pressure correction offset mapping table when the gear of the engine is in neutral is shown in Table 6, and the atmospheric pressure correction coefficient mapping table when the gear of the engine is in neutral is shown in Table 7.

[0098] The air-fuel ratio limit value basic mapping table is constructed as follows: it is obtained through a bench test, and the process is as follows:

[0099] First, the initial values of the air-fuel ratio limit value basic table are all set to 23.

[0100] Second step, remove the supercharger, diesel engine in the natural aspiration conditions, while access to gas flow meter test intake flow. Exhaust pipe access smoke meter, test smoke value FSN.

[0101] Third step. Set the speed of the idle 800 rpm, gradually increase the throttle, when the smoke value FSN is about 1.5, record the intake flow AirFlow and fuel consumption Fuel, calculate the air fuel ratio AirFuelRatio = AirFlow / Fuel, and fill in the mapping table, the current boost pressure is atmospheric pressure.

[0102] Fourth step, set the speed to 1000 rpm, repeat the third step operation.

[0103] Fifth step, by analogy, gradually increase 200 rpm, until the maximum speed, repeat the third step operation. From this, the lower limit value of the air fuel ratio is obtained.

[0104] Sixth step, install the supercharger, do the external characteristic test. Set the speed of the idle 800 rpm, throttle 100%, get the boost pressure, speed at this time, through the intake flow AirFlow and fuel consumption Fuel, calculate the air fuel ratio, and fill in the value at this time boost pressure, speed mapping position.

[0105] Seventh step, by analogy, gradually increase 200 rpm, until the maximum speed, repeat the sixth step operation. From this, the upper limit value of the air fuel ratio is obtained.

[0106] Eighth step, after obtaining the upper and lower limits, linear interpolation operation is performed in the middle to complete the entire table.

[0107] Ninth step, verify the results again through the test, fine-tune the data.

[0108] Table 3 air fuel ratio limit value basic mapping table

[0109]

[0110]

[0111] In table 3, the row is the speed data, the column is the intake boost pressure data, and the value in the table is the air fuel ratio.

[0112] Table 4 water temperature correction offset mapping table

[0113] 800 900 1000 1200 1400 1600 1800 2000 2200 2400 10 0 0 0 0.1 0.2 0.3 0.42 0.45 0.56 0.56 20 0 0 0 0.1 0.3 0.3 0.42 0.45 0.56 0.56 30 0 0 0 0.1 0.3 0.3 0.42 0.45 0.56 0.56 40 0 0 0 0.1 0.3 0.3 0.45 0.45 0.56 0.56 50 0 0 0 0.1 0.3 0.3 0.45 0.45 0.56 0.56 60 0 0 0 0.1 0.3 0.3 0.45 0.45 0.56 0.56 70 0 0 0 0.1 0.3 0.3 0.45 0.45 0.56 0.56 80 0 0 0 0.1 0.3 0.3 0.46 0.46 0.56 0.56 90 0 0 0 0.2 0.3 0.3 0.47 0.47 0.56 0.56 100 0 0 0 0.2 0.3 0.3 0.48 0.48 0.56 0.56 110 0 0 0 0.2 0.3 0.3 0.48 0.48 0.56 0.56 120 0 0.1 0.2 0.2 0.3 0.3 0.48 0.48 0.56 0.56 130 0.1 0.2 0.2 0.2 0.3 0.3 0.48 0.48 0.56 0.56 140 0.2 0.2 0.2 0.2 0.3 0.3 0.48 0.48 0.56 0.56 150 0.2 0.2 0.2 0.2 0.3 0.3 0.48 0.48 0.56 0.56

[0114] In table 4, the row represents the speed data, and the column represents the intake boost pressure data. The value in the table is the correction offset value.

[0115] Table 5 water temperature correction coefficient mapping table

[0116] -30 -20 -10 0 10 20 30 40 50 60 … K 1.5 1.4 1.3 1.2 1.4 1 1 1 1 0.9

[0117] In Table 5, the row represents the cooling water temperature data, and the value in the table represents the water temperature correction coefficient K.

[0118] Table 6 Atmospheric pressure correction offset mapping table (neutral gear)

[0119]

[0120]

[0121] Table 7 Atmospheric pressure correction coefficient mapping table (neutral gear)

[0122] \ -20 -10 0 10 20 30 40 60 70 80 90 98 40 1.3 1.25 1.2 1.13 1.1 1.08 1.05 1.0 0.94 0.9 0.86 0.8 50 1.3 1.25 1.21 1.13 1.13 1.08 1.05 1.02 0.94 0.91 0.86 0.82 62 1.32 1.28 1.21 1.13 1.13 1.1 1.08 1.03 0.95 0.92 0.86 0.82 72 1.35 1.28 1.21 1.15 1.13 1.1 1.08 1.03 0.96 0.92 0.86 0.82 80 1.38 1.28 1.21 1.15 1.13 1.1 1.08 1.03 0.97 0.92 0.86 0.83 90 1.4 1.28 1.21 1.15 1.13 1.22 1.08 1.05 0.98 0.92 0.86 0.83 100 1.41 1.29 1.25 1.16 1.13 1.12 1.08 1.05 0.98 0.93 0.86 0.83 110 1.41 1.32 1.26 1.18 1.13 1.12 1.08 1.05 0.99 0.93 0.87 0.83 120 1.41 1.32 1.26 1.20 1.13 1.12 1.08 1.05 0.99 0.93 0.88 0.85 130 1.41 1.32 1.26 1.20 1.13 1.12 1.08 1.05 1.0 0.93 0.88 0.85 …

[0123] There are 7 atmospheric pressure correction offset mapping tables, which are the neutral gear atmospheric pressure correction coefficient table and the 1-6 gear atmospheric pressure correction coefficient table; similarly, there are also 7 atmospheric pressure correction offset tables, which are the neutral gear atmospheric pressure correction offset table and the 1-6 gear atmospheric pressure correction offset table.

[0124] In some embodiments, the data processing unit is further specifically configured to: query the air-fuel ratio limit value basic value corresponding to the combination of the rotation speed data and the intake supercharging pressure data in the air-fuel ratio limit value basic mapping table; query the water temperature correction offset value corresponding to the combination of the rotation speed data and the intake supercharging pressure data in the water temperature correction offset table; query the water temperature correction coefficient corresponding to the cooling water temperature data in the water temperature correction coefficient mapping table; query the atmospheric pressure correction offset value corresponding to the combination of the rotation speed data and the intake supercharging pressure data in the atmospheric pressure correction offset mapping table; and query the atmospheric pressure correction coefficient corresponding to the combination of the cooling water temperature data and the intake supercharging pressure data in the atmospheric pressure correction coefficient mapping table.

[0125] The data processing unit is further specifically configured to calculate the air-fuel ratio limit value by using the air-fuel ratio limit value basic value, the water temperature correction offset value, the water temperature correction coefficient, the atmospheric pressure correction offset value, and the atmospheric pressure correction coefficient.

[0126] Specifically, the air-fuel ratio limit value calculation formula is as follows:

[0127]

[0128] Wherein, AFRO represents the air-fuel ratio limit value base value, KCW represents the water temperature correction coefficient, BCW represents the water temperature correction offset value, AFR1 represents the air-fuel ratio limit value base correction value, KIA represents the atmospheric pressure correction coefficient, BIA represents the atmospheric pressure correction offset value, and AFR represents the air-fuel ratio limit value.

[0129] The data processing unit is further specifically configured to obtain the quotient of the stroke intake amount and the air-fuel ratio limit value to obtain the smoke-limiting fuel amount.

[0130] The data processing unit is further specifically configured to construct a fuel amount to pulse width mapping table; wherein the fuel amount to pulse width mapping table is a two-dimensional table, the rows of the fuel amount to pulse width mapping table represent the speed data, the columns of the fuel amount to pulse width mapping table represent the smoke-limiting fuel amount, and the domains of the fuel amount to pulse width mapping table represent the fuel injection pulse width; specifically, the fuel amount to pulse width mapping table is as shown in Table 8.

[0131] The data processing unit is further specifically configured to query the fuel injection pulse width under the combination of the smoke-limiting fuel amount and the speed data in the fuel amount to pulse width mapping table.

[0132] Table 8 Fuel amount to pulse width mapping table

[0133] 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2400 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 25.63 25.63 20.63 15.63 12.09 5 0 0 0 0 0 0 0 0 0 0 8 30.96 30.96 28.96 23.96 17.96 12.88 6.5 0 0 0 0 0 0 0 0 0 10 35.2 35.2 33.2 31.2 26.2 19.95 14.91 7 0 0 0 0 0 0 0 0 15 40 40 40 40 37 32 24.67 17.34 7.5 0 0 0 0 0 0 0 20 45 45 45 45 45 42 37 25.93 16.86 8 0 0 0 0 0 0 25 50 50 50 50 50 49 43 35 25.25 15.5 8.5 0 0 0 0 0 30 55 55 55 55 55 55 50 45 35 25.75 17.5 9 0 0 0 0 35 60 60 60 60 60 60 57 54 46 36 26.59 20.19 9.5 0 0 0 40 65 65 65 65 65 65 65 62 55 47 37 27.86 20.72 10.29 0 0 45 70 70 70 70 70 70 70 70 64 56 48 38 29.63 21.52 12.24 0 50 75 75 75 75 75 75 75 75 75 70 60 51 42.63 33.73 25.3 14.65 55 80 80 80 80 80 80 80 80 80 79 75 67 59 48.2 39.67 27.01 60 85 85 85 85 85 85 85 85 85 85 84 79 72 64 56.23 47.47 65 90 90 90 90 90 90 90 90 90 90 90 87 81.5 76 69.5 62 …

[0134] The embodiment of the present application calculates the smoke-limiting fuel amount by collecting the speed data, intake supercharging pressure data, cooling water temperature data, intake temperature data and atmospheric pressure data of the explosion-proof diesel engine, and controls the fuel injection control valve through the smoke-limiting fuel amount to prevent the explosion-proof diesel engine from appearing smoke phenomenon when the fuel injection amount is too much.

[0135] In some other embodiments, an explosion-proof diesel engine smoke control method is also provided, and the specific technical scheme is as follows:

[0136] An explosion-proof diesel engine smoke control method is applied to the above explosion-proof diesel engine smoke control device, and includes the following steps:

[0137] The speed data, intake supercharging pressure data, cooling water temperature data, gear data, intake temperature data and atmospheric pressure data of the explosion-proof diesel engine are collected by using a data collection unit;

[0138] The intake flow data of the explosion-proof diesel engine is calculated by using a data processing unit according to the speed data, the intake supercharging pressure data and the intake temperature data;

[0139] The data processing unit calculates the stroke intake air volume according to the intake air flow data, the rotation speed data, the number of cylinders of the explosion-proof diesel engine and the number of strokes of the explosion-proof diesel engine; wherein the stroke intake air volume is the intake air flow of the cylinder of the explosion-proof diesel engine in one stroke;

[0140] The data processing unit calculates the air-fuel ratio limit value according to the intake air supercharging pressure data, the intake air temperature data, the rotation speed data, the cooling water temperature data and the atmospheric pressure data;

[0141] The data processing unit calculates the smoke limit oil amount according to the rotation speed data, the stroke intake air volume and the air-fuel ratio limit value; and calculates the fuel injection pulse width of the explosion-proof diesel engine according to the smoke limit oil amount;

[0142] The fuel injection control unit outputs a valve control signal according to the fuel injection pulse width;

[0143] The fuel injection control valve changes its opening and closing state under the control of the valve control signal, thereby controlling the fuel injection amount of the explosion-proof diesel engine.

[0144] As shown in Figure 2 The step of calculating the intake air flow data of the explosion-proof diesel engine is as follows:

[0145] The rotation speed and the supercharging pressure are collected;

[0146] The corresponding air flow basic value WO is obtained from the air flow meter according to the rotation speed and the supercharging pressure;

[0147] The intake air temperature is collected;

[0148] The corresponding intake air temperature correction value K is obtained from the intake air temperature correction table according to the intake air temperature;

[0149] The air flow AirFlow under the current working condition is calculated as WO*K;

[0150] The cylinder single-stroke intake air flow AirFlowCyl under the current working condition, i.e. the intake air flow of the cylinder of the explosion-proof diesel engine in one stroke, is calculated according to the number of strokes CylinderStroke, the number of cylinders CylinderNum and the air flow AirFlow:

[0151] AirFlowCyl=(AirFlow*CylinderStroke) / (EngineSpeed*CylinderNum*2).

[0152] As shown in Figure 3 The step of calculating the air-fuel ratio limit value is as follows:

[0153] Collecting the rotating speed, the supercharging pressure, the cooling water temperature;

[0154] According to the rotating speed and the supercharging pressure, the air-fuel ratio limit value basic table is inquired to obtain an air-fuel ratio basic limit value AFRO;

[0155] According to the cooling water temperature, a water temperature correction coefficient table is inquired to obtain a water temperature correction coefficient KCW;

[0156] According to the rotating speed and the supercharging pressure, a water temperature correction offset table is inquired to obtain a water temperature correction offset value BCW;

[0157] The air-fuel ratio basic limit correction value AFR1 is calculated by using the air-fuel ratio basic limit value AFRO, the water temperature correction coefficient KCW and the water temperature correction offset value BCW; the calculation formula is: AFR1 = AFRO*KCW+BCW;

[0158] The gear information is collected, and according to the gear information, the cooling water temperature and the atmospheric pressure, an atmospheric pressure correction coefficient table is inquired to obtain an atmospheric pressure correction coefficient KIA; wherein different gears correspond to different gear information, and different gear information corresponds to different atmospheric pressure correction coefficient tables;

[0159] According to the gear information, the rotating speed and the supercharging pressure, an atmospheric pressure correction offset table is inquired to obtain a water temperature correction offset BIA;

[0160] The air-fuel ratio limit value AFR is calculated by using the air-fuel ratio basic limit correction value AFR1, the atmospheric pressure correction coefficient KIA and the water temperature correction offset BIA; the calculation formula is: AFR = AFR1*KIA+BIA.

[0161] Wherein, the rotating speed represents the above rotating speed data, the supercharging pressure represents the above intake supercharging pressure data, the air flow basic value WO represents the above intake flow basic data; the intake temperature represents the above intake temperature data, the atmospheric pressure represents the above atmospheric pressure data, and the cooling water temperature represents the above cooling water temperature data.

[0162] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. within the concept and principle of the present application, should be included in the protection scope of the present application.

Claims

1. An anti-knock diesel smoke control system characterized by comprising: The application relates to a device for preventing abnormal smoke of an explosion-proof diesel engine, comprising: a data acquisition unit for acquiring rotation speed data, intake supercharging pressure data, cooling water temperature data, intake temperature data and atmospheric pressure data of the explosion-proof diesel engine; a data processing unit for calculating intake flow data of the explosion-proof diesel engine according to the rotation speed data, the intake supercharging pressure data and the intake temperature data; calculating stroke intake amount according to the intake flow data, the rotation speed data, cylinder number of the explosion-proof diesel engine and stroke number of the explosion-proof diesel engine; wherein the stroke intake amount is the intake flow of the cylinder of the explosion-proof diesel engine in one stroke; calculating air-fuel ratio limit value according to the intake supercharging pressure data, the intake temperature data, the rotation speed data, the cooling water temperature data and the atmospheric pressure data; calculating smoke limiting oil amount according to the rotation speed data, the stroke intake amount and the air-fuel ratio limit value; and calculating injection pulse width of the explosion-proof diesel engine according to the smoke limiting oil amount; an injection control unit for outputting valve control signals according to the injection pulse width; an injection control valve for changing the opening and closing state of the valve under the control of the valve control signals, so as to control the injection amount of the explosion-proof diesel engine; the data processing unit is specifically used for constructing an air flow table and an intake temperature correction table; wherein the air flow table is a two-dimensional table, the rows of the air flow table represent the rotation speed data, the columns of the air flow table represent the intake supercharging pressure data, and the domains of the air flow table are intake flow basic data; the intake temperature correction table is a one-dimensional table, the rows of the intake temperature correction table represent the intake temperature data, and the domains of the intake temperature correction table represent temperature correction coefficients; the data processing unit is further specifically used for querying the air flow table according to the rotation speed data and the intake supercharging pressure data to obtain intake flow basic data corresponding to the rotation speed data and the intake supercharging pressure data; querying the intake temperature correction table according to the intake temperature data to obtain the temperature correction coefficient corresponding to the intake temperature data; and calculating the intake flow data according to the intake flow basic data and the temperature correction coefficient; the data processing unit is further specifically used for presetting a plurality of different rotation speed data and a plurality of different intake supercharging pressure data; the data acquisition unit is specifically used for acquiring theoretical intake amounts of the explosion-proof diesel engine under a plurality of different rotation speed data respectively, and obtaining a plurality of theoretical intake amounts correspondingly; the data processing unit is further specifically used for calculating the charge efficiency corresponding to each rotation speed data by using each rotation speed data and the corresponding theoretical intake amount, and obtaining a plurality of charge efficiencies correspondingly; the data acquisition unit is further specifically used for acquiring intake temperatures of the explosion-proof diesel engine under any rotation speed data and any intake supercharging pressure data, and obtaining a plurality of intake temperature data correspondingly. The data processing unit is further configured to calculate air density by using any of the rotation speed data, any of the intake boost pressure data, and the corresponding intake temperature data, thereby obtaining a plurality of air density data; and calculate the intake flow of the explosion-proof diesel engine under the combination of any of the rotation speed data and any of the intake boost pressure data according to any of the rotation speed data, the corresponding charge efficiency, the corresponding air density data, and the displacement of the explosion-proof diesel engine, thereby obtaining a plurality of the intake flow basic data.

2. The smoke control system of the explosion-proof diesel engine according to claim 1, wherein The data acquisition unit is further configured to acquire the intake flow of the explosion-proof diesel engine under the condition of each of the rotation speed data corresponding to the intake temperature data by using a gas flow meter, thereby obtaining a plurality of actual intake flow data. The data processing unit is further configured to calculate the temperature correction coefficient corresponding to each of the intake temperature data according to the intake flow basic data corresponding to each of the intake temperature data and the actual intake flow data.

3. The smoke control system of the explosion-proof diesel engine according to claim 1, wherein The data processing unit is further configured to obtain the intake flow data by multiplying the intake flow basic data and the temperature correction coefficient.

4. The smoke control system of the explosion-proof diesel engine according to claim 3, wherein The data processing unit is further configured to obtain a first product value by multiplying the intake flow data and the number of strokes of the explosion-proof diesel engine, and obtain a second product value by multiplying the rotation speed data and the number of cylinders of the explosion-proof diesel engine; The data processing unit is further configured to obtain a third product value by multiplying the second product value by 2, and obtain the stroke intake amount by dividing the first product value by the third product value.

5. The smoke control system of the explosion-proof diesel engine according to claim 1, wherein The data processing unit is also specifically configured to construct an air-fuel ratio limit value basic mapping table, a water temperature correction offset table, a water temperature correction coefficient mapping table, an atmospheric pressure correction offset mapping table, and an atmospheric pressure correction coefficient mapping table; the air-fuel ratio limit value basic mapping table, the water temperature correction offset table, the atmospheric pressure correction offset mapping table, and the atmospheric pressure correction coefficient mapping table are two-dimensional tables, and the water temperature correction coefficient mapping table is a one-dimensional table; the rows of the air-fuel ratio limit value basic mapping table represent the rotation speed data, the columns of the air-fuel ratio limit value basic mapping table represent the intake supercharging pressure data, and the domains of the air-fuel ratio limit value basic mapping table represent air-fuel ratio limit value basic values; the rows of the water temperature correction offset table represent the rotation speed data, the columns of the water temperature correction offset table represent the intake supercharging pressure data, and the domains of the water temperature correction offset table represent water temperature correction offset values; the rows of the water temperature correction coefficient mapping table represent the cooling water temperature data, and the domains of the water temperature correction coefficient mapping table represent water temperature correction coefficients; the rows of the atmospheric pressure correction offset mapping table represent the rotation speed data, the columns of the atmospheric pressure correction offset mapping table represent the intake supercharging pressure data, and the domains of the atmospheric pressure correction offset mapping table represent atmospheric pressure correction offset values; and the rows of the atmospheric pressure correction coefficient mapping table represent the cooling water temperature data, the columns of the atmospheric pressure correction coefficient mapping table represent the intake supercharging pressure data, and the domains of the atmospheric pressure correction coefficient mapping table represent atmospheric pressure correction coefficients. The data processing unit is also specifically configured to query the air-fuel ratio limit value basic values corresponding to the rotation speed data and the intake supercharging pressure data in the air-fuel ratio limit value basic mapping table, query the water temperature correction offset values corresponding to the rotation speed data and the intake supercharging pressure data in the water temperature correction offset table, query the water temperature correction coefficients corresponding to the cooling water temperature data in the water temperature correction coefficient mapping table, query the atmospheric pressure correction offset values corresponding to the rotation speed data and the intake supercharging pressure data in the atmospheric pressure correction offset mapping table, and query the atmospheric pressure correction coefficients corresponding to the cooling water temperature data and the intake supercharging pressure data in the atmospheric pressure correction coefficient mapping table. The data processing unit is also specifically configured to calculate the air-fuel ratio limit value by using the air-fuel ratio limit value basic values, the water temperature correction offset values, the water temperature correction coefficients, the atmospheric pressure correction offset values, and the atmospheric pressure correction coefficients.

6. The smoke control system for an anti-explosion diesel engine according to claim 5, wherein The data processing unit is also specifically configured to obtain the smoke limiting fuel amount by calculating the quotient of the stroke intake amount and the air-fuel ratio limit value.

7. The smoke control system for an anti-explosion diesel engine according to claim 6, wherein The data processing unit is further configured to construct an oil quantity to pulse width mapping table, wherein the oil quantity to pulse width mapping table is a two-dimensional table, rows of the oil quantity to pulse width mapping table represent the rotation speed data, columns of the oil quantity to pulse width mapping table represent the smoke-limiting oil quantity, and domains of the oil quantity to pulse width mapping table represent the fuel injection pulse width; The data processing unit is further configured to query the fuel injection pulse width corresponding to the smoke-limiting oil quantity and the rotation speed data in the oil quantity to pulse width mapping table.

8. A method of controlling smoke from an anti-knock diesel engine, characterized by, The application is applied to the smoke control system of the explosion-proof diesel engine according to any one of claims 1 to 7, and comprises the following steps: The rotation speed data, the intake supercharging pressure data, the cooling water temperature data, the intake temperature data and the atmospheric pressure data of the explosion-proof diesel engine are collected by using the data collection unit; The intake flow data of the explosion-proof diesel engine is calculated by using the data processing unit according to the rotation speed data, the intake supercharging pressure data and the intake temperature data; The stroke intake quantity is calculated by using the data processing unit according to the intake flow data, the rotation speed data, the number of cylinders of the explosion-proof diesel engine and the number of strokes of the explosion-proof diesel engine, wherein the stroke intake quantity is the intake flow of the cylinder of the explosion-proof diesel engine in one stroke; The air-fuel ratio limit value is calculated by using the data processing unit according to the intake supercharging pressure data, the intake temperature data, the rotation speed data, the cooling water temperature data and the atmospheric pressure data; The smoke-limiting oil quantity is calculated by using the data processing unit according to the rotation speed data, the stroke intake quantity and the air-fuel ratio limit value, and the fuel injection pulse width of the explosion-proof diesel engine is calculated according to the smoke-limiting oil quantity; The valve control signal is output by using the fuel injection control unit according to the fuel injection pulse width; The opening and closing state of the fuel injection control valve is changed under the control of the valve control signal, so as to control the fuel injection quantity of the explosion-proof diesel engine.

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