KR20190071961A - Method for Reducing Vibration Control Based on Engine Torque Convergence and Vehicle thereof - Google Patents

Abstract

In an engine torque convergence vibration reduction control method applied to a vehicle (1) of the present invention, an engine torque is checked immediately before a starting off based on an engine load when starting an engine (1-1), a fuel injection amount for the engine torque immediately before the start off is calculated, and the engine torque gradually converges to zero at the starting off by an engine torque convergence control for controlling the fuel injection amount until the engine stops, so that vehicle vibrations associated with engine vibrations are greatly reduced due to amplitude reduction and minimization of vibration intensity, and especially, an engine torque control is realized based on the fuel injection amount, thereby improving the vehicle vibrations without constraints of Jake brake or throttle valve.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and a vehicle for reducing vibration in an engine torque convergence method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a start-off control of a vehicle, and more particularly, to a vehicle in which vehicle vibration due to engine vibration is reduced by an engine torque convergence method at startup.

Generally, in commercial vehicles, engine torque instantly drops to zero due to the descent of the engine torque when the engine is turned off, regardless of the type of the middle or large-sized vehicle.

The commercial vehicle applies start-off engine behavior control or start-off intake control to reduce start-off vibration.

For example, the startup OFF engine behavior control method is suitable for a commercial vehicle to which a Jake brake is applied by performing a start off engine behavior control using a Jake brake. On the other hand, the starting off intake control system is suitable for a commercial vehicle in which the jake brake is not applied by controlling the intake air flow rate when the engine is turned off using an intake throttle valve.

Therefore, medium and large sized commercial vehicles can reduce the vibration of the driver's seat together with the engine vibration when starting off by performing the control of the start off engine behavior or the start off intake control.

Korean Patent Laid-Open No. 10-2004-0097483 (November 11, 2004)

However, the start off engine control using Jake brake is limited to Jake brake commercial vehicle, while the start off intake flow control is a restriction of hardware performance of throttle valve.

Particularly, since the start-off intake flow rate control is faster in closing the throttle valve, the vibration reduction effect is large, but the control range of the closing speed is very limited due to the endurance limit of the valve spring tension and the vibration reduction effect in the control region is also large There is no other way.

Accordingly, the present invention takes the above-mentioned points into consideration, and the engine torque is gradually converged to 0 (zero) at the start-off time through the engine torque control, so that the vibration of the vehicle accompanied by the engine tremble is greatly reduced due to the amplitude reduction and the minimization of the vibration intensity. The object of the present invention is to provide an engine torque convergence type vibration reduction control method and vehicle capable of improving the vehicle vibration without restriction of the Jake brake or the throttle valve by implementing the engine torque control based on the fuel injection amount of the engine.

According to another aspect of the present invention, there is provided a vibration reduction control method including an engine torque convergence control for controlling a fuel injection amount for the engine when a start-off of the engine is detected by a controller.

In a preferred embodiment, the fuel injection amount is controlled until the engine stops.

In a preferred embodiment, the engine torque convergence control is an idle torque confirmation control in which the engine torque is checked immediately before the engine is started based on the engine load at the time of the start-off, the fuel injection amount is calculated with respect to the engine torque immediately before the start- And the idle torque reduction control in which the injection quantity control is performed.

The idle torque confirmation control may include: (A) detecting a start-off signal in response to the start-off; (B) determining the engine load; (C) Revolution Per Minute) is confirmed to be the start idle RPM, (D) the step of confirming whether or not the operation of the Excel pendulum is operated, (E) the start idle RPM is checked at the engine torque immediately before the start .

As a preferable idle torque check control example, the determination of the engine load is made by an air conditioner ON / OFF signal. The idle RPM classification is divided into a load threshold value and an unused load threshold value when the engine load is applied. The no-load threshold value is smaller than the load threshold value.

As a preferred embodiment, the idle torque reduction control includes: (F) application of a torque reduction map to the engine torque immediately before the start-off is classified; (G) calculation of an engine reduction torque amount based on the torque reduction map (H) a step of calculating a fuel injection amount corresponding to the engine reduction torque output amount; (I) a step in which the fuel injection amount control is continued until the engine is stopped in accordance with the fuel injection amount calculation value.

As a preferred idle torque reduction control embodiment, the torque reduction map is a TIME torque reduction map based on the RPM torque reduction map and the TIME-torque reduction curve line based on the RPM-torque reduction curve line. The RPM-torque reduction curve line is based on the torque reduction curve based on the idle torque amount immediately before the start-off time, and the torque is calculated by multiplying the idle torque before the start-up by the ratio. The TIME-torque reduction curve diagram is based on the torque reduction curve based on the idle torque amount immediately before start-off using the time delay, and the torque is calculated by multiplying the idle torque before the start-up by the ratio.

According to another aspect of the present invention, there is provided a vehicle including: an engine; An engine torque convergence control is performed in which the engine torque immediately before the engine is started is checked based on the engine load when the engine is started and the fuel injection quantity is calculated with respect to the engine torque immediately before the engine starts and the fuel injection quantity is controlled until the engine is stopped And a controller for controlling the motor.

In a preferred embodiment, the controller has a torque base map for calculating the fuel injection amount by applying the engine torque immediately before the start-off.

In a preferred embodiment, the torque base map includes an RPM torque reduction map and a TIME torque reduction map. The RPM torque reduction map is constructed as an RPM-torque table which is calculated by using a torque reduction curve based on the idle torque amount immediately before the engine start and a torque lower than the idle revolution speed of the engine and multiplying the torque by the ratio to the idle torque before starting the engine. The TIME torque reduction map is constructed with an RPM-torque table calculated by using a time delay and using a torque reduction curve based on an idle torque immediately before startup and a torque multiplied by a ratio to an idle torque before startup.

The vibration reduction control applied to the vehicle of the present invention, particularly a commercial vehicle, realizes the following actions and effects by applying the engine torque convergence method.

First, even when the engine is started and turned off, the engine torque is not instantly dropped to 0 (zero) and gradually falls, thereby greatly improving the vehicle vibration accompanying the engine vibration. Second, it reduces the vibration amplitude and minimizes the vibration intensity by the engine torque zero convergence method that stops the engine when the rotation inertia force is reduced when the engine is started. Third, engine torque zero convergence is implemented as engine torque control, providing a feeling of smooth start-off to the driver. Fourth, the engine torque control is based on fuel injection, which improves vehicle vibration without the need for jaw brakes or throttle valve restrictions. Fifth, the application of Jake brake or throttle valve to vibration damping during start off resolves the commercial vehicle.

FIG. 2 is a view showing an example of a vehicle in which the engine torque convergence type vibration reduction control according to the present invention is performed. FIG. 3 is a graph showing the relationship between the RPM torque Torque reduction curve map of the reduction map and a TIME-torque reduction curve line of the TIME torque reduction map, and Fig. 4 is a torque progressive descent diagram based on the revolution based on the vibration reduction control based on the RPM torque reduction map according to the present invention , And FIG. 5 is a time-based torque gradual descent diagram as shown in the vibration reduction control based on the TIME torque reduction map according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

Referring to FIG. 1, in the vibration reduction control method, a fuel injection amount control for reducing the engine torque is performed after engine torque confirmation (S10 to S60) just before the engine is turned off (S70 to S100). Particularly, the fuel injection quantity control is performed based on the RPM torque reduction map (S70) or the TIME torque reduction map (S70-1). Therefore, the vibration reduction control method implements the engine torque convergence control.

As a result, in the engine torque convergence control of the vibration reduction control method, the torque gradually decreases after the start-off, and the engine can be stopped in a state where the rotational inertia force is reduced, so that the amplitude of the vibration is reduced so that the strength of the vibration felt by the driver is minimized , Especially a soft start off feel.

Referring to Fig. 2, the vehicle 1 includes a controller 10 in which a start-off fuel injection quantity control is performed together with the operation control of the engine 1-1 and the engine 1-1.

Specifically, the engine 1-1 is an internal combustion engine, and is an engine for a commercial vehicle.

Specifically, the controller 10 includes a data input unit 10-1 and a torque base map 20. For example, the data input unit 10-1 detects an IG ON / OFF signal of a start ON / OFF, an engine RPM (Revolution Per Minute), an accelerator pedal scale amount, an air conditioner ON.OFF signal, And provides the detected information to the controller 10 as startup OFF vehicle information. The torque base map 20 is divided into an RPM torque reduction map 20-1 and a TIME torque reduction map 20-2.

Referring to FIG. 3, the RPM torque reduction map 20-1 uses the torque reduction curve based on the idle torque immediately before start-off at the idle speed rpm of the engine 1-1, It is built as a table. The TIME torque reduction map 20-2 is constructed as an RPM-torque table using the torque reduction curve based on the idle torque immediately before startup using the time delay. In this case, the torque (%) calculation is calculated by multiplying the Idle torque before the start-off by the ratio (%).

Hereinafter, an engine torque convergence type vibration reduction control method will be described in detail with reference to FIG. 2 to FIG. In this case, the control subject is the controller 10 associated with the data input section 10-1 and the torque base map 20. [ The control object is the engine 1-1, and in particular, an injector that injects fuel to the engine cylinder.

The controller 10 performs idle torque confirmation control, and the idle torque confirmation control includes a step S10 of confirming a start-off, a step S20 of detecting a start-off signal, an step S30 of determining an engine load state, , The step of checking the idling idle RPM, the step of confirming the exhalation of the valve S50, and the step of confirming the engine torque immediately before the ignition off of the starting idle RPM of the step S60.

Referring to FIG. 2, the controller 10 reads the IG OFF signal provided by the data input unit 10-1 and confirms the start OFF (S10) and the start OFF signal 210. Further, the controller 10 determines the engine load S30 according to the air conditioner operation with the air conditioner ON signal provided from the data input unit 10-1, and sets the minimum idle RPM (S30) corresponding to the engine no- S40) or the maximum idle RPM (S40-1) which is adjusted to the engine load when the air conditioner is ON. The controller 10 reads the amount of opening of the pedal provided by the data inputting section 10-1 and outputs the minimum idle RPM S40 or the maximum idle RPM S40 in the state where the amount of opening of the pedal pedal is 0% Confirm the idle RPM (S40-1) as the start idle RPM and the engine torque immediately before the start off (S60).

In particular, the controller 10 applies the following equations to the minimum idle RPM S40 and the maximum idle RPM S40-1.

Minimum idle RPM judgment: E _{rpm _min} <A

Determine maximum idle RPM: E _{rpm _max} <B

Where "E _{rpm _ min} " is the minimum idle RPM, "A" applies 600 RPM to the no-load threshold for the idle RPM of the engine no-load, "E _{rpm _max} " is the maximum idle RPM, &Quot; B &quot; applies 650 RPM as a load threshold for the reference idle RPM of the engine load. And "<" means an inequality indicating the magnitude of the two values, and "E _{rpm _min} <A" and "E _{rpm _min} <B" means that "A" and "B" are larger values. Thus, controller 10 is 600 RPM (A) the minimum idle RPM (E _{rpm _min)} to determine and, 650 RPM (B) less than determines the maximum idle RPM (E _{rpm _min),} those starting Off immediately before engine torque is less than (S60).

As a result, the controller 10 confirms the minimum / maximum idle RPM suitable for the amount of fuel injection in which a feeling of smooth start-off feeling is realized by determining whether or not the air conditioner operates when the engine 1-1 is started.

The controller 10 performs idle torque reduction control, and the idle torque reduction control includes a torque reduction map classification step of S70 / S70-1, a torque reduction map based engine reduction torque calculation step of S80 / S80-1, A fuel injection amount control step, and a fuel injection stop step according to the engine stop of S100. In this case, the RPM torque reduction map of S70 and the TIME torque reduction map of S70-1 are distinguished from each other in order to more effectively utilize the torque gradual descent characteristic according to the RPM of the engine 1-1 and the torque progressive descent characteristic with respect to time to be.

Referring to the RPM torque reduction map 20-1 of Fig. 2, the controller 10 determines whether the RPM-torque reduction map 20-1 shown in Fig. 3 is applied by applying the RPM basis of S70 to the engine torque just before the start- 1 based on the RPM-torque reduction curve diagram of the RPM-based engine reduction torque calculation (S80), and performs the fuel injection amount control (S90) until the engine stop (S100) with the calculated RPM-based engine reduction torque.

FIG. 4 is a result of an experiment of a torque gradual descent diagram based on the revolution of the engine, showing that the engine torque is gradually lowered in accordance with the existing torque line descent ratio RPM.

On the other hand, referring to the TIME torque reduction map 20-2 of FIG. 2, the controller 10 applies the TIME-based map of S70-1 to the engine torque immediately before the confirmed start-off, 20-2 based on the TIME-torque reduction curve diagram (S80-1), and the fuel injection amount control S90 is performed until the engine stop (S100) with the calculated TIME-based engine reduction torque .

Fig. 5 is a result of an experiment of a time-based torque gradual descent diagram of the engine, showing that the engine torque is gradually lowered in accordance with the existing torque line descent contrast time.

As described above, in the engine torque convergence type vibration reduction control method applied to the vehicle 1 according to the present embodiment, the engine torque is checked immediately before the engine is started, based on the engine load when the engine 1-1 is started. The engine torque convergence control in which the fuel injection amount control is performed until the engine is stopped after calculating the fuel injection amount with respect to the engine torque just before the start-up Off gradually converges the engine torque to 0 (zero) The vibration of the vehicle accompanied by the engine shake is greatly reduced. In particular, the engine torque control is implemented based on the fuel injection amount of the engine, thereby improving the vehicle vibration without restriction of the Jake brake or the throttle valve.

1: vehicle 1-1: engine
10: controller 10-1: data input unit
20: Torque Base Map
20-1: RPM torque reduction map 20-2: TIME torque reduction map

Claims (15)

When the start-up Off of the engine is detected by the controller, an engine torque convergence control
Wherein the vibration reduction control method comprises the steps of:
The vibration reduction control method according to claim 1, wherein the fuel injection amount is controlled until the engine is stopped.
The engine torque convergence control system according to claim 1, wherein the engine torque convergence control is an idle torque confirmation control in which engine torque confirmation is performed immediately before start-off based on an engine load at the start-off time, And the idle torque reduction control in which the injection amount control is performed.
The idle torque confirmation control method according to claim 3, wherein the idle torque confirmation control comprises: (A) detecting a start-off signal in accordance with the start-up Off; (B) determining the engine load; Revolution Per Minute) is confirmed to be the start idle RPM, (D) the step of confirming whether or not the operation of the Excel pendulum is operated, (E) the start idle RPM is checked at the engine torque immediately before the start Step
The vibration reduction control method comprising the steps of:
5. The vibration reduction control method according to claim 4, wherein the determination of the engine load comprises an air conditioner ON / OFF signal.
The method according to claim 4, wherein the idle RPM classification is divided into a load threshold value and an unused threshold value in the application of the engine load.
The vibration reduction control method according to claim 6, wherein the no-load threshold value is smaller than the load threshold value.
The idle torque reduction control method according to claim 3, wherein the idle torque reduction control comprises the steps of: (F) applying application of a torque reduction map to the engine torque immediately before the start-off; (G) calculating an engine reduction torque amount based on the torque reduction map (H) calculating a fuel injection amount corresponding to the engine reduction torque output amount, (I) maintaining the fuel injection amount control until the engine stops in accordance with the fuel injection amount calculation value
The vibration reduction control method comprising the steps of:
9. The method of claim 8, wherein the torque reduction map is a TIME torque reduction map based on a RPM torque reduction map based on an RPM-torque reduction curve diagram and a TIME-torque reduction curve diagram.
[Claim 12] The method according to claim 9, wherein the RPM-torque reduction curve line is based on a torque reduction curve based on an idle torque amount immediately before start-off at an idle rotation speed (Idle rpm) or less and a torque is calculated by multiplying an idle torque before start- Wherein the vibration reduction control method comprises the steps of:
The method of claim 9, wherein the TIME-torque reduction curve line is based on a torque reduction curve based on an idle torque amount immediately before start-off using a time delay, and the torque is calculated by multiplying an idle torque before startup by a ratio Vibration reduction control method.
engine;
An engine torque convergence control is performed in which the engine torque immediately before the engine is started is checked based on the engine load when the engine is started and the fuel injection quantity is calculated with respect to the engine torque immediately before the engine starts and the fuel injection quantity is controlled until the engine is stopped Controller;
&Lt; / RTI &gt;
13. The vehicle according to claim 12, wherein the controller has a torque base map for calculating the fuel injection amount by applying the engine torque immediately before the start-up Off.
14. The engine control system according to claim 13, wherein the torque base map includes an RPM torque reduction map, wherein the RPM torque reduction map uses a torque reduction curve based on an idle torque amount immediately before starting off below the idle speed (Idle rpm) Torque table calculated by multiplying the ratio of the idle torque before the start-up to the torque by the ratio.
14. The method of claim 13, wherein the torque base map comprises a TIME torque reduction map, wherein the TIME torque reduction map uses a torque reduction curve based on an idle torque amount immediately before starting off using a time delay, Torque table calculated by multiplying the torque by a ratio.

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