KR100295858B1 - Apparatus for controlling lean burn - Google Patents

Abstract

PURPOSE: A lean burn control apparatus is provided to improve an acceleration force and an air/fuel ratio of a vehicle by detecting the transmission steps according to the states of the vehicle to be driven. CONSTITUTION: A lean burn control apparatus comprises a vehicle information detecting section(10), a control section(20), an injector(30), and a manifold throttle valve(40). The vehicle information detecting section(10) detects the state of the vehicle which can be varied depending on environment around the vehicle. The vehicle information detecting section(10) includes an engine RPM detecting section(11) which detects an RPM of the engine and outputs a predetermined electric signal corresponding to the RPM of the engine, a vehicle speed sensor(12) which detects a vehicle speed and outputs a predetermined electric signal corresponding to the vehicle speed, and a throttle position sensor(13) for detecting an opening degree of a throttle valve.

Description

Lean burn control device

The present invention relates to a lean burn engine, and more particularly, to detect a shift stage according to a relationship between a vehicle speed and an engine speed of a running vehicle, and to accurately determine a state of the vehicle according to the detected shift stage. A lean burn control device is provided to provide stability.

In general, the lean burn engine determines whether the vehicle is in an accelerated state in preparation for high oil prices and depletion of petroleum resources, and operates at the theoretical air-fuel ratio when the vehicle is in an accelerated state. By improving the fuel efficiency of the engine and the emission of harmful exhaust gases by operating in a lean burn zone burned at a ratio of fuel and fuel, the conventional lean burn zone determination method detects and analyzes information on the engine speed, load, and vehicle speed The combustion zone was detected and the amount of fuel injected was adjusted.

As described above, the detection of the lean burn region applied to a conventional vehicle has a problem of deteriorating the operability such as rapid acceleration due to an imbalance between the state of the vehicle and the engine output due to the relationship not considering the gear shift stage of the vehicle.

The present invention has been made in view of the above-described problems, and its object is to detect the number of stages of each gear stage according to the state of the vehicle being driven and to determine whether it is in an acceleration state or a steady state according to the engine speed corresponding to each stage. Judging from the acceleration of the fuel in the theoretical state, and in the steady state in the case of the normal air-fuel ratio is less than the theoretical fuel ratio to operate the ratio of air and fuel to improve the acceleration and fuel economy.

The present invention for achieving the above object comprises a vehicle information detecting means for detecting a state of the vehicle changes according to the surrounding environment of the vehicle being driven;

Control means for detecting a shift stage in accordance with a signal applied from the vehicle information detecting means and adjusting the amount of injected fuel in accordance with the state of the shift stage and the vehicle;

An injector for injecting a corresponding fuel amount in accordance with a signal applied from the control means;

And a manifold throttle valve which forms a vortex in the combustion chamber to dilute the injected fuel.

1 is a block diagram showing a lean burn control device in a lean burn engine according to an embodiment of the present invention.

FIG. 2 is a flowchart of one embodiment for executing lean burn control in the embodiment of the present invention of FIG.

<Description of the symbols for the main parts of the drawings>

10: vehicle information detection unit

11: engine speed detection unit

12: vehicle speed sensor

13: Throttle Position Sensor

20: control unit

30: injector

40: Manifold Throttle Valve

Below. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen in Figure 1, in the lean burn engine according to an embodiment of the present invention, the lean burn control device includes a vehicle information detector 10, a controller 20, an injector 30, and a manifold throttle valve ( 40), the vehicle information detection unit 10 detects a state of the vehicle that changes depending on the surrounding environment of the vehicle being driven.

At this time, the vehicle information detection unit 10 detects the engine speed fluctuating during operation and outputs a predetermined electrical signal corresponding to the engine speed detection unit 11, and detects the vehicle speed of the vehicle being driven A vehicle speed sensor 12 for outputting a predetermined electrical signal and a throttle position sensor 13 for detecting an opening degree of a throttle valve for controlling the amount of air sucked into the engine according to the accelerator pedal and outputting a corresponding electrical signal. Consists of

The control unit 20 compares the vehicle speed and the engine speed of the vehicle according to the signal applied from the vehicle information detection unit 10 to detect the number of stages of the transmission according to the driving state of the vehicle, thereby accelerating and constant speed according to each stage of the transmission. The state is judged and the overall control signal for controlling the theoretical performance ratio operation and the lean burn region operation is outputted.

For example, the number of stages of the transmission in accordance with the driving state of the vehicle can be obtained as follows.

N / V RATIO = (ENG RPM) / (VEHICLE SPEED) ..... Equation (1)

(N / V RATIO = ratio of engine speed to vehicle speed

ENG RPM = engine speed

VEHICLE SPEED = vehicle speed

In the formula (1), the engine speed (ENG RPM) is calculated by detecting the constant value in the control unit 20 according to the signal applied from the engine speed detection unit 11 of the vehicle information detection unit 10, the vehicle speed ( VEHICLE SPEED calculates and detects a predetermined value in the control unit 20 according to a signal applied from the vehicle speed sensor 12 of the vehicle information detection unit 10.

At this time, in the case of a vehicle having a gear ratio (GEAR RATIO) as shown in Table 1, it is possible to easily know the current gear stage by the calculation as in Equation 1.

division 1 stage 2-stage 3-stage 4-stage 5 steps Longitudinal deceleration gear ratio (FGR) Gear ratio 3.462 1.95 1.393 1.061 0.837 3.842 Total gear ratio 13.30 7.49 5.35 4.08 3.22

here, V : Speed of the vehicle, RPM : Engine speed, R _r = Radius of the tire, TOTAL G / RATIO Overall gear ratio

In addition, the engine speed (ENG RPM) according to each vehicle speed and gear stage is calculated as shown in Table 2.

Vehicle speed (KPH) 1 stage 2-stage 3-stage 4-stage 5 steps 10 1261 710 507 20 2521 1420 1015 30 3782 2130 1522 1159 40 5043 2840 2029 1545 1219 50 3551 2536 1932 1524 60 4261 3044 2318 1829 70 4971 3551 2705 2134 80 5681 4058 3091 2438 90 6391 4565 3477 2743 100 5073 3864 3048 110 5580 4250 3353 120 4636 3658

In this case, the ratio of engine speed to vehicle speed, ie, N / V RATIO, of each stage is calculated as shown in Table 3 below.

Vehicle speed (KPH) 1-speed NVR 2-stage NVR 3-stage NVR 4-speed NVR 5-speed NVR 10 126.07 71.01 50.73 20 126.07 71.01 50.73 30 126.07 71.01 50.73 38.64 40 126.07 71.01 50.73 38.64 30.48 50 71.01 50.73 38.64 30.48 60 71.01 50.73 38.64 30.48 70 71.01 50.73 38.64 30.48 80 71.01 50.73 38.64 30.48

Therefore, as shown in Table 3, when the ratio of engine speed to vehicle speed, that is, N / V RATIO is calculated, it can be seen that N / V RATIO of each stage is constant as shown in Table 1 above.

That is, the number of stages of the current transmission may be detected by the engine speed and the vehicle speed applied to the controller 20.

In addition, the controller 20 is configured to set the throttle valve opening amount and the vehicle speed applied to the throttle position sensor 13 and the vehicle speed sensor 10 of the vehicle information detector 10 in the memory table of the controller 20. The driving state of the vehicle can be determined by comparing with the value.

For example, it is determined that the opening amount of the throttle valve detected by the throttle position sensor 13 of the vehicle information detection unit 11 is larger than a predetermined value set according to each stage of the transmission set in the memory table of the control unit 20. Or, if it is determined that the traveling speed of the vehicle detected by the vehicle speed sensor 12 of the vehicle information detection unit 11 is smaller than a predetermined value set according to each stage of the transmission set in the memory table of the control unit 20. The driving vehicle is not in constant speed, so drive at the theoretical air-fuel ratio.

On the other hand, if it is determined that the opening amount of the throttle valve is smaller than the predetermined value or the driving speed of the vehicle is higher than the predetermined value, the driving vehicle is in the constant speed state, and thus, the lean combustion region is operated at a ratio of air and fuel with a much lower fuel amount than the theoretical air-fuel ratio. Drive.

The injector 30 injects fuel into the engine combustion chamber according to the signal applied from the control unit 20.

The manifold throttle valve 40 controls the fuel injected from the lean burn injector 30 to form a vortex in the combustion chamber.

The operation for lean burn control of a vehicle operated in the present invention having the function as described above will be described with reference to FIG.

The control unit 20 detects the engine speed, the vehicle speed, and the throttle valve opening degree according to the signal applied from the vehicle information detection unit 10 (step 110).

In step 110, the engine speed applied by the engine speed detection unit 11 of the vehicle information detection unit 10 is compared with the vehicle speed applied by the vehicle speed sensor 12 of the vehicle information detection unit 10 to detect the number of stages of the transmission. (Step 120).

When the gear stage of the transmission is detected in step 120, it is determined whether the gear stage of the transmission is one gear (step 130). If the gear stage is one gear, lean burn control is not executed (step 131). Otherwise, it is determined whether the number of stages of the transmission is two (step 140).

If it is determined in step 140 that the number of stages of the transmission is two, the lean burn control is not executed. If it is determined that the number of stages of the transmission is not two, it is determined whether the number of stages of the transmission is three (step 150).

If it is determined in step 150 that the number of gear stages is three gears, the transmission in which the throttle valve opening amount detected according to the signal applied from the throttle position sensor 13 of the vehicle information detection unit 10 is set in the memory table of the control unit 20. The vehicle speed detected by a value greater than the throttle valve opening amount corresponding to three stages of the vehicle or detected according to a signal applied from the vehicle speed sensor 12 of the vehicle information detection unit 10 is set in the memory table of the controller 20. It is determined whether it is detected with a value smaller than the vehicle speed corresponding to the third stage of the transmission (step 151).

If the condition of the step 150 is not satisfied, that is, if it is determined that the number of stages of the transmission is not three, it is determined whether the number of stages of the transmission is four (step 160).

If it is determined in step 160 that the number of stages of the transmission is four, the transmission in which the throttle valve opening amount detected according to the signal applied by the throttle position sensor 13 of the vehicle information detection unit 10 is set in the memory table of the control unit 20. The vehicle speed detected by a value larger than the opening amount of the throttle valve corresponding to four stages of the vehicle or detected according to a signal applied from the vehicle speed sensor 12 of the vehicle information detection unit 10 is set in the memory table of the controller 20. It is determined whether it is detected with a value smaller than the vehicle speed corresponding to the fourth stage of the transmission (step 161).

If the condition of step 160 is not satisfied, that is, if it is determined that the number of stages of the transmission is not four, it is determined whether the number of stages of the transmission is five (step 170).

If it is determined in step 170 that the gear stage is 5 gears, the transmission amount of the throttle valve detected according to the signal applied from the throttle position sensor 13 of the vehicle information detector 10 is set in the memory table of the controller 20. The vehicle speed detected by a value greater than the opening amount of the throttle valve corresponding to the fifth stage of the vehicle or detected by the signal applied from the vehicle speed sensor 12 of the vehicle information detector 10 is set in the memory table of the controller 20. It is determined whether it is detected with a value smaller than the vehicle speed corresponding to the fifth stage of the transmission (step 171).

At this time, when the conditions of steps 151, 161, and 171 are satisfied, that is, the engine speed detection unit 11 of the vehicle information detection unit 10 and the engine speed and vehicle speed detected by the vehicle speed sensor 12 are controlled. If it is detected as a value larger or smaller than the predetermined value set in the memory table of (20), the driving vehicle is not in the constant speed driving state and does not enter the lean burn area, and the conditions of steps 151, 161 and 171 are If it is not satisfied, that is, when the engine speed and the vehicle speed are detected to be smaller or larger than a predetermined value set in the memory table of the control unit 20, the engine enters the lean burn area and injects a predetermined control signal corresponding thereto. ) And injects the mixer to the engine combustion chamber at a ratio of air and fuel having a much thinner fuel amount than the theoretical air-fuel ratio (step 180).

As described above, the present invention detects the stage number of each gear stage according to the state of the vehicle being driven, and determines whether the engine is in an acceleration state or a normal state according to the engine speed corresponding to each stage. When the vehicle is in a steady state, the fuel is operated at a ratio of air and fuel having a much lower fuel amount than the theoretical air-fuel ratio, thereby providing reliability in driving with stable acceleration and improved fuel economy.

Claims (3)

A lean burn control device comprising: vehicle information detecting means for detecting a state of a vehicle that changes in accordance with a surrounding environment of a driven vehicle; Control means for detecting a shift stage in accordance with a signal applied from the vehicle information detecting means and adjusting the amount of injected fuel in accordance with the state of the shift stage and the vehicle; An injector for injecting a corresponding fuel amount in accordance with a signal applied from the control means; And a manifold throttle valve for diluting the injected fuel by forming a vortex in the combustion chamber, wherein the control means compares the throttle valve opening amount and the vehicle speed with a predetermined value set in the memory table of the control unit to determine each stage of the transmission. The lean burn control device, characterized in that for determining the corresponding constant speed driving and acceleration driving state. The engine information detection unit of claim 1, wherein the vehicle information detection unit controls an engine speed detection unit that detects a rotational speed of the engine that is changed while driving, a vehicle speed sensor that detects a vehicle speed of a running vehicle, and an amount of air sucked into the engine according to an accelerator pedal. A lean burn control device comprising a throttle position sensor for detecting an opening degree of a throttle valve. The lean burn control apparatus according to claim 1, wherein the control unit detects the number of stages of the current transmission as the engine speed and the vehicle speed applied by the engine speed detection unit and the vehicle speed sensor using the following equation. N / V RATIO = (ENG RPM) / (VEHICLE SPEED) (N / V RATIO = ratio of engine speed to vehicle speed, ENG RPM = engine speed, VEHICLE SPEED = vehicle speed)

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