KR100501286B1 - Apparatus for emission control of diesel vehicle and method thereof - Google Patents

Abstract

When the shift of the down shift is detected in a diesel engine vehicle, the smoke reduction control is performed by comparing the fuel amount calculated based on the intake air amount with the fuel limit fuel amount for the shift stage and applying a minimum value.

Calculating a target fuel amount reflecting the driver's will according to the accelerator pedal displacement and the engine speed in the state of driving at an arbitrary shift stage; determining whether the current vehicle condition satisfies the downshift shift control condition; If the down shift shift control condition is not satisfied, normal control is performed, and if the down shift shift control condition is satisfied, a process of extracting the maximum fuel amount for the shift stage from the set smoke limit fuel level map, and a target fuel amount reflecting the driver's will and Comparing the maximum fuel amount extracted from the smoke limit fuel amount map to determine a minimum value as the final fuel amount, and calculating an injector driving time for the determined final fuel amount and injecting the determined fuel amount into each combustion chamber.

Description

Smoke control system and method of diesel vehicle {APPARATUS FOR EMISSION CONTROL OF DIESEL VEHICLE AND METHOD THEREOF}

The present invention relates to a vehicle equipped with a diesel engine, and more particularly, when a shift of a down shift is detected, a minimum value is applied by comparing the amount of fuel calculated based on the amount of intake air with the amount of smoke limited fuel for the shift stage. It relates to a smoke control device and a method of a diesel vehicle so that the smoke reduction control is performed.

In general, when a vehicle equipped with a diesel engine is a manual transmission equipped with a manual transmission to increase driving power, a downshift to a low shift stage is performed or when a vehicle equipped with an automatic transmission is operated, a kick-down shift is performed by operating an accelerator pedal. It is common to carry out.

At this time, the engine control means measures the change amount of the drive of the accelerator pedal and the engine speed (RPM), and then the basic necessary for pilot injection and main injection for each cylinder from the set map table (Drive ability Map) The fuel amount is determined, the fuel amount of the various correction values is calculated in consideration of the basic stability of the vehicle, and the final injection fuel amount is determined in consideration of the basic fuel amount and the fuel amount of the various correction values.

However, although the artificial increase in the engine speed due to the gear ratio does not help the increase in the amount of air flowing into the actual combustion chamber, it is expected that the amount of air in the section of the high engine speed will be large due to the characteristics of normal driving. Reduction of generation Fuel quantity higher than the map data is injected into the combustion chamber to cause the generation of smoke due to incomplete combustion.

Therefore, the method of performing injection control is compared with the amount of soot limited fuel set by each shift stage (neutral, 1 to 5 stages) without injecting the determined final injection fuel amount as it is.

However, in order to limit the generation of smoke, regardless of the driver's intention, the current driving state is output as the limited fuel amount calculated by using the air volume and the engine speed, and thus, there is a side effect in which the actual feeling of the driver falls. Solving by increasing the limit fuel amount has the side effect that smoke is generated.

In particular, when the driver changes gears due to lack of driving force due to lack of driving force, for example, while driving in the fourth stage, the limited fuel level calculation logic does not detect this despite the lack of air intake by the engine. Inevitably there is a disadvantage that soot is generated.

The generation of soot has a very bad effect on the commerciality of diesel vehicles, and it is a representative factor that causes the customer to lose awareness of diesel vehicles.

The present invention has been invented to solve the above problems, and its purpose is to add a down shift determination condition to the soot limitation logic in a vehicle equipped with a diesel engine, but there is a sudden increase in the engine speed during driving, but is substantially sucked into the engine. The amount of air is determined to be insufficient so that the soot reduction control is performed through the injection of a stable amount of fuel.

That is, when the engine control means detects a sudden increase in the engine speed due to the downshift, and judges whether the clutch pedal is operated or not, the downshift is calculated so that the fuel amount is lower than the smoke limit limit used in the usual period. By doing so, soot reduction control is performed.

The present invention for realizing the above object is a process for calculating a target fuel amount that reflects the driver's will in accordance with the accelerator pedal displacement and the engine speed in the state of driving to any gear; Determining whether the current vehicle condition satisfies the downshift shift control condition; Performing normal control if the downshift shift control condition is not satisfied, and extracting a maximum fuel amount for the shift stage from the set smoke limit fuel amount map if the downshift shift control condition is satisfied; Determining a minimum value as a final fuel amount by comparing a target fuel amount reflecting the driver's will with a maximum fuel amount extracted from the smoke limit fuel amount map; Calculating an injector driving time with respect to the determined final fuel amount, and injecting the determined fuel amount into each combustion chamber.

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

As can be seen in FIG. 1, the apparatus for controlling soot of a diesel vehicle according to the present invention includes an accelerator pedal detector 10, a vehicle speed detector 20, a clutch detector 30, an engine speed detector 40, and a controller 50. , The memory unit 60 and the injector 70, the accelerator pedal detection unit 10 detects the drive displacement of the accelerator pedal driven by the driver for engine torque adjustment and outputs an electrical signal thereto.

The vehicle speed detection unit 20 detects the current driving vehicle speed by detecting the rotation speed of the transfer driven gear in the case of a vehicle equipped with a manual transmission, and the PG-B sensor in the case of a vehicle equipped with an automatic transmission. The current driving vehicle speed is detected from the signal and an electrical signal corresponding thereto is output.

In the case of a vehicle equipped with a manual transmission, the clutch detector 30 detects whether the power is regulated for shifting and outputs an electrical signal therefor.

The engine speed detection unit 40 detects the current engine speed from the rotation detection of the crankshaft and outputs an electrical signal thereto.

The controller 50 analyzes each of the detected state information and compares the final fuel amount with the smoke limit fuel amount set for each shift stage, if the current fuel amount calculation condition includes a downshift shift condition. Control so that injection can be performed.

In the memory unit 60, an operation algorithm of the control unit 50 is set, and map data on the amount of smoke limit fuel for each shift stage is set.

The injector 70 injects the amount of fuel calculated in the corresponding combustion chamber according to the control signal applied from the controller 50.

An operation of performing the smoke reduction control by applying the configuration of the present invention including the above function will be described with reference to FIGS. 2 and 3 as follows.

When the vehicle equipped with the diesel engine is driven while maintaining the engine start-up (S101), the control unit 50 is a vehicle equipped with the displacement of the accelerator pedal, the current driving vehicle speed, and the manual transmission, which is the driver's engine torque adjustment request. By detecting whether the clutch pedal is in power, engine speed, and other state information (S102), the target fuel amount reflecting the driver's will is calculated based on this (S103).

Subsequently, it is determined whether the current vehicle control condition is a downshift shift condition from the kick-down shift control in the case of a manual transmission equipped vehicle with the clutch pedal, or in the case of an automatic transmission equipped vehicle.

The downshift shift condition is set to a condition in which the engine speed is set to a reference value, for example, 100 RPM / 0.1 sec or more, the power interruption by the clutch pedal is detected, and the shift stage is recognized as the downshift at the lower end.

If it is determined that the condition is not the downshift shifting condition (S110), if it is determined that the downshift shifting condition is determined, the shift stage currently down-shifted from the smoke limit fuel amount map for each shift stage set in the memory unit 60 is performed. Extract the maximum amount of fuel (S105).

Thereafter, the target fuel amount calculated in S103 is compared with the amount of smoke limited fuel extracted in S105 (S106), the final fuel amount is determined by selecting a minimum value (S107), and then the driving time of the injector 70 is calculated for the determined fuel amount (S107). S108), the injection of the fuel amount calculated through the drive control of the injector 70 is performed (S109).

Therefore, as can be seen from FIG. 3, when the engine speed is increased by the downshift shifting, the fuel generation is suppressed by injecting a low fuel amount.

If the target fuel amount calculated in S103 is equal to or less than the exhaust limit fuel amount extracted in S105, the final fuel amount is determined by the target fuel amount reflecting the driver's will, and when the exhaust limit fuel amount is small, the final fuel amount is determined.

As described above, the present invention can extremely reduce the generation of soot during downshift, which is always a problem in diesel vehicles, which can contribute to the improvement of the overall marketability of the vehicle and prevent various quality problems in advance. To improve satisfaction.

1 is a block diagram of a configuration for controlling the soot of a diesel vehicle according to the present invention.

2 is a flowchart of an embodiment of performing soot control in a diesel vehicle according to the present invention;

3 is a state graph for the soot control in a diesel vehicle according to the present invention.

Claims (4)

An accelerator pedal detection unit detecting a drive displacement of the accelerator pedal for driving the engine torque; A vehicle speed detector for detecting a current vehicle speed; A clutch detector for detecting a power interruption for shifting in the case of a vehicle equipped with a manual transmission; An engine speed detection unit for detecting a current engine speed; By analyzing the state information of the vehicle to calculate a target fuel amount that reflects the driver's will, and if the downshift shift condition, the fuel injection can be performed by comparing the calculated target fuel amount and the fuel limit fuel amount set for each shift stage with a small value A control unit for controlling the control unit to be controlled; A memory unit for setting map data on the amount of smoke limited fuel for each shift stage; And an injector for injecting an amount of fuel calculated in a corresponding combustion chamber according to a control signal applied from the control unit. Calculating a target fuel amount reflecting the driver's will in accordance with the accelerator pedal displacement and the engine speed in the state of traveling at an arbitrary speed change stage; Determining whether the current vehicle condition satisfies the downshift shift control condition; Performing normal control if the downshift shift control condition is not satisfied, and extracting a maximum fuel amount for the shift stage from the set smoke limit fuel amount map if the downshift shift control condition is satisfied; Determining a minimum value as a final fuel amount by comparing a target fuel amount reflecting the driver's will with a maximum fuel amount extracted from the smoke limit fuel amount map; And injecting the determined fuel amount into each combustion chamber by calculating an injector driving time for the determined final fuel amount. The method of claim 2, The downshift shift control condition is an engine rotational speed equal to or greater than a set reference value, power interruption by a clutch pedal is detected, and the shift stage is set to a state in which a downshift to a lower stage is recognized. . The method of claim 2, In the final fuel amount determination, if the target fuel amount that reflects the driver's will is less than the smoke limit fuel amount, the final fuel amount is determined, and if the target fuel amount is more than the smoke limit fuel amount, the fuel limit fuel amount is determined as the final fuel amount. Smoke control method.