KR102394631B1 - Method for Reducing Vibration Control Based on Engine Torque Convergence and Vehicle thereof - Google Patents

Abstract

In the engine torque convergence method vibration reduction control method applied to the vehicle 1 of the present invention, when the engine 1-1 is started off, the engine torque is checked just before the start-off based on the engine load, and the engine torque just before the start-off is Engine torque convergence control, in which fuel injection amount control is performed until the engine is stopped after calculating the fuel injection amount for Vibration is greatly reduced, and in particular, the engine torque control is implemented based on the fuel injection amount of the engine, so that the vehicle vibration is improved without restrictions on the Jake brake or the throttle valve.

Description

Method for Reducing Vibration Control Based on Engine Torque Convergence and Vehicle thereof

The present invention relates to start-off control of a vehicle, and more particularly, to a vehicle in which vehicle vibration caused by engine vibration is reduced by an engine torque convergence method when starting-off.

In general, for commercial vehicles, regardless of the type of medium or large type, when the engine is turned off, the engine torque momentarily drops to 0 due to a linear drop in engine torque, which inevitably causes driver's seat vibration in addition to engine vibration.

For this reason, commercial vehicles apply start-off engine behavior control or start-off intake control to reduce start-off vibration.

For example, the start-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 start-off intake control method is suitable for a commercial vehicle to which a Jake brake is not applied by controlling the intake air flow when the engine is turned off by using an intake throttle valve.

Therefore, mid-to-large commercial vehicles reduce engine vibration and driver's seat vibration when starting off by performing start-off engine behavior control or start-off intake control.

Domestic Patent Laid-Open Patent 10-2004-0097483 (2004.11.18)

However, start-off engine behavior control using Jake brake is a method that has limitations limited to commercial vehicles applying Jake brake, whereas start-off intake air flow control is a method that has limitations on the hardware performance of the throttle valve.

In particular, in the start-off intake air flow control, the faster the throttle valve is closed, the greater the vibration reduction effect. It has no choice but to have limitations.

Accordingly, in the present invention, in consideration of the above points, the engine torque gradually converges to 0 (zero) when starting off through engine torque control, so that the vehicle vibration accompanying the engine vibration is greatly reduced by reducing the amplitude and minimizing the vibration intensity. An object of the present invention is to provide an engine torque convergence method vibration reduction control method and vehicle that can improve vehicle vibration without restrictions on the Jake brake or throttle valve by implementing engine torque control based on the fuel injection amount of the engine.

The vibration reduction control method of the present invention for achieving the above object is characterized in that, when engine start-off is detected by the controller, the engine torque convergence control for controlling the fuel injection amount for the engine is included.

As a preferred embodiment, the fuel injection amount is controlled until the engine is stopped.

In a preferred embodiment, the engine torque convergence control includes an idle torque check control in which an engine torque check just before starting off is performed based on the engine load when the startup is off, and after calculating the fuel injection amount with respect to the engine torque just before starting off, the fuel It is divided into idle torque reduction control in which injection amount control is performed.

As a preferred embodiment, the idle torque check control includes (A) detecting a start-off signal according to the start-off, (B) determining the engine load, (C) idling RPM ( Revolution Per Minute) and check the engine OFF idle RPM, (D) check whether the accelerator is operated or not, (E) when the accelerator is not operated, check the ignition OFF idle RPM as the engine torque just before starting off is divided into stages.

As a preferred embodiment of the check control for the idle torque, the determination of the engine load is made by an air conditioner ON/OFF signal. The idle RPM is divided into a load threshold value when the engine load is applied and a no-load threshold value when the engine load is not applied. The no-load threshold is a value smaller than the load threshold.

As a preferred embodiment, the idle torque reduction control includes (F) a step in which the application of the torque reduction map to the engine torque just before the start-off is divided, (G) the torque reduction map is based on which the calculated engine reduced torque is calculated It is divided into a step, (H) a step in which the fuel injection amount is calculated according to the calculated amount of reduced engine torque, and (I) a step in which the fuel injection amount control according to the calculated fuel injection amount is maintained until the engine is stopped.

As a preferred embodiment of the idle torque reduction control, the torque reduction map is an RPM torque reduction map based on an RPM-torque reduction curve diagram and a TIME torque reduction map based on a TIME-torque reduction curve diagram. The RPM-torque reduction curve diagram is based on a torque reduction curve based on the idle torque amount just before the start-off below the idle rotation speed (Idle rpm), and the torque is calculated by multiplying the idle torque before the start-off by a ratio. The TIME-torque reduction curve diagram is based on a torque reduction curve based on an idle torque amount just before starting off using a time delay, and the torque is calculated by multiplying the idle torque before starting off by a ratio.

And the vehicle of the present invention for achieving the above object is an engine; When the engine is started off, the engine torque is checked just before starting off based on the engine load, and after calculating the fuel injection amount for the engine torque just before the starting off, the engine torque convergence control is implemented to control the fuel injection amount until the engine is stopped. It is characterized in that the controller is included.

As a preferred embodiment, the controller includes a torque base map that calculates the fuel injection amount by applying the engine torque just before the start-off.

As 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 calculated by using a torque reduction curve based on an idle torque amount just before starting off at less than or equal to the idle rotation speed of the engine, and multiplying the torque by a ratio to the idle torque before starting off. The TIME torque reduction map is constructed as an RPM-torque table calculated by using a torque reduction curve based on the idle torque amount just before starting off using a time delay, and multiplying the torque by the ratio of the idle torque before starting off.

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

First, even when the engine is turned off, the engine torque does not instantaneously drop to 0 (zero) but gradually drops, so that the vehicle vibration accompanying the engine vibration is greatly improved. Second, the engine torque zero convergence method that stops the engine while reducing the rotational inertia when the engine is turned off reduces the vibration amplitude and minimizes the vibration intensity, which has a great effect on vehicle vibration reduction. Third, the zero convergence of engine torque is implemented as engine torque control, providing the driver with a feeling of smooth start-off. Fourth, since engine torque control is based on fuel injection amount, vehicle vibration is improved without Jake brake or throttle valve restrictions. Fifth, it has excellent applicability to commercial vehicle types by eliminating the restrictions caused by the Jake brake or throttle valve in vibration low when starting off.

1 is a flowchart of an engine torque convergence method vibration reduction control method according to the present invention, FIG. 2 is an example of a vehicle in which the engine torque convergence method vibration reduction control according to the present invention is performed, and FIG. 3 is an RPM torque according to the present invention The RPM-torque reduction curve diagram of the reduction map and the TIME-torque reduction curve diagram of the TIME torque reduction map are examples, and FIG. 4 is a rotational speed-based torque gradual descending diagram that appears as vibration reduction control based on the RPM torque reduction map according to the present invention. , FIG. 5 is a time-based torque gradual descent diagram showing vibration reduction control based on a TIME torque reduction map according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying illustrative drawings, and since these embodiments are examples, those of ordinary skill in the art to which the present invention pertains may be implemented in various different forms. It is not limited to the embodiment.

Referring to FIG. 1 , in the vibration reduction control method, the fuel injection amount control for the reduced engine torque is performed before the engine is stopped after the engine torque is checked (S10 to S60) just before the engine is turned off (S70 to S100). In particular, the fuel injection amount control is characterized in that it 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 engine torque convergence control.

As a result, in the engine torque convergence control of the vibration reduction control method, the torque gradually drops after starting off, and the engine can be stopped in a state where the rotational inertia is reduced, thereby reducing the amplitude of the vibration and minimizing the intensity of the vibration felt by the driver. , which provides a particularly smooth start-off feeling.

Referring to FIG. 2 , the vehicle 1 includes an engine 1-1 and a controller 10 that performs start-off fuel injection amount control together with driving control of the engine 1-1.

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

In detail, 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 starting ON/OFF, an engine RPM (Revolution Per Minute), an accelerator pedal scope, an air conditioner ON/OFF signal, and the like; The detected information is provided to the controller 10 as ignition 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 a torque reduction curve based on the idle torque amount just before starting off at the idle rotation speed (Idle rpm) of the engine 1-1 or less. built as a table. The TIME torque reduction map 20-2 is constructed as an RPM-torque table using a torque reduction curve based on an idle torque amount just before starting off using a time delay. In this case, the torque (%) is calculated by multiplying the idle torque before starting off by the ratio (%).

Hereinafter, an engine torque convergence method vibration reduction control method will be described in detail with reference to FIGS. 2 to 5 . In this case, the control subject is the data input unit 10 - 1 and the controller 10 linked to the talk base map 20 . The control object is the engine 1-1, and in particular, an injector that injects fuel into engine cylinders.

The controller 10 performs the idle torque check control, and the idle torque check control includes the start-off check step of S10, the start-off signal detection step of S20, the engine load state determination step of S30, and the engine load of S40/S40-1. It is divided into the engine torque check step just before starting off for the start OFF idle RPM check step, the accelerator shutoff check step S50, and the start OFF idle RPM check step S60 according to the following.

Referring to FIG. 2 , the controller 10 reads the IG OFF signal provided from the data input unit 10 - 1 to check the start OFF ( S10 ) and the start OFF signal 210 . In addition, the controller 10 determines the engine load (S30) according to the operation of the air conditioner with the air conditioner ON signal provided by the data input unit 10-1, and the minimum idle RPM ( S40) or the maximum idle RPM (S40-1) that matches the engine load when the air conditioner is turned on. In addition, the controller 10 reads the accelerator pedal opening amount provided from the data input unit 10-1, and in a state where the accelerator pedal opening amount is 0% (that is, the pedal is not operated) (S50), the minimum idle RPM (S40) or the maximum Check the engine torque (S60) just before starting off by setting the idle RPM (S40-1) as the starting OFF idle RPM.

In particular, the controller 10 applies the following determination formula to the minimum idle RPM (S40) and the maximum idle RPM (S40-1).

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

Maximum idle RPM judgment: E _{rpm _max} < B

Here, “E _{rpm _ min} ” is the minimum idle RPM, “A” is the no-load threshold for the reference idle RPM of the engine no-load, 600 RPM is applied, and “E _{rpm _max} “ is the maximum idle RPM, "B" applies 650 RPM as a load threshold for the reference idle RPM of the engine load. And “<” is an inequality sign indicating the magnitude of the two values. “E _{rpm _min} < A” and “E _{rpm _min} < B” means that “A” and “B” are larger values. Therefore, the controller 10 determines less than 600 RPM (A) as the minimum idle RPM (E _{rpm _min} ), and determines less than 650 RPM (B) as the maximum idle RPM (E _{rpm _min} ), and determines these as the engine torque just before starting Off (S60) is applied.

As a result, the controller 10 checks the minimum/maximum idle RPM suitable for the fuel injection amount at which a smooth start-off feeling is realized by setting whether the air conditioner operates as an engine load condition when the engine 1-1 is started off.

Then, the controller 10 performs the idle torque reduction control, and the idle torque reduction control is 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 step of S90 It is divided into a fuel injection amount control step and a fuel injection stop step according to the engine stop of S100. In this case, the distinction between the RPM torque reduction map of S70 and the TIME torque reduction map of S70-1 is to more effectively use the torque gradual decrease characteristic according to the RPM and the torque gradual decrease characteristic according to the time of the engine 1-1. am.

Referring to the RPM torque reduction map 20-1 of FIG. 2, the controller 10 performs the RPM-torque reduction map 20- of FIG. RPM-based engine reduced torque calculation based on the RPM-torque reduction curve of 1) is performed (S80), and fuel injection amount control (S90) is performed until the engine is stopped (S100) with the calculated RPM-based engine reduced torque.

4 is an experimental result of a torque gradual drop-down diagram based on the number of revolutions of the engine, and shows that the engine torque is gradually decreased according to the RPM compared to the conventional torque linear decrease.

On the other hand, referring to the TIME torque reduction map 20-2 of FIG. 2, the controller 10 applies the TIME base of S70-1 to the engine torque just before the checked start-off, the TIME-torque reduction map ( Based on the TIME-torque reduction curve diagram of 20-2), the TIME-based engine reduction torque calculation is made (S80-1), and the fuel injection amount control (S90) is performed until the engine stops (S100) with the calculated TIME-based engine reduction torque. carry out

5 is an experimental result of a time-based torque gradual descent curve of the engine, and shows that the engine torque is gradually lowered with time compared to the conventional torque linear drop.

As described above, in the engine torque convergence method vibration reduction control method applied to the vehicle 1 according to the present embodiment, the engine torque is checked just before starting off based on the engine load when the engine 1-1 is started off, It is an engine torque convergence control in which fuel injection amount control is performed until the engine is stopped after calculating the fuel injection amount for the engine torque just before the start-off. As a result, vehicle vibration accompanying engine vibration is greatly reduced, and in particular, engine torque control is implemented based on the fuel injection amount of the engine, improving vehicle vibration without limitation of the Jake brake or 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 engine start-off is detected by the controller, engine torque convergence control for controlling the fuel injection amount for the engine is included,
The engine torque convergence control is an idle torque check control in which the engine torque is checked just before starting off based on the engine load when the starting is off, and the fuel injection amount control is performed after calculating the fuel injection amount for the engine torque just before the starting off Vibration reduction control method, characterized in that it is divided into idle torque reduction control.
The method according to claim 1, wherein the fuel injection amount is controlled until the engine is stopped.
delete The method according to claim 1, wherein the idle torque check control comprises: (A) detecting a start-off signal according to the start-off, (B) determining the engine load, (C) idling RPM ( Revolution Per Minute) and check the engine OFF idle RPM, (D) check whether the accelerator is operated or not, (E) when the accelerator is not operated, check the engine torque just before starting off the ignition OFF idle RPM step to be
Vibration reduction control method, characterized in that divided into.
The method according to claim 4, wherein the determination of the engine load is made by an air conditioner ON/OFF signal.
The method according to claim 4, wherein the idle RPM classification is divided into a load threshold value when the engine load is applied and a no-load threshold value when the engine load is not applied.
The method of claim 6, wherein the no-load threshold value is smaller than the load threshold value.
The method according to claim 1, The idle torque reduction control, (F) the step of dividing the application of the torque reduction map to the engine torque immediately before the start-off, (G) the torque reduction map based on the calculated engine reduced torque calculation step, (H) calculating the fuel injection amount in accordance with the calculated amount of reduced engine torque, (I) maintaining the fuel injection amount control in accordance with the calculated fuel injection amount until the engine is stopped
Vibration reduction control method, characterized in that divided into.
The method of claim 8, wherein the torque reduction map is an RPM torque reduction map based on an RPM-torque reduction curve diagram and a TIME torque reduction map based on a TIME-torque reduction curve diagram.
The method according to claim 9, wherein the RPM-torque reduction curve curve is based on a torque reduction curve based on the idle torque amount just before the start-off below the idle rotation speed (Idle rpm), and the torque is calculated by multiplying the idle torque before the start-off by a ratio Vibration reduction control method, characterized in that.
The method according to claim 9, wherein the TIME-torque reduction curve diagram is based on a torque reduction curve based on the amount of idle torque just before starting off using a time delay, and the torque is calculated by multiplying the idle torque before starting off by a ratio Vibration reduction control method.
engine;
When the engine is started off, the engine torque is checked just before starting off based on the engine load, and after calculating the fuel injection amount for the engine torque just before the starting off, the engine torque convergence control is implemented to control the fuel injection amount until the engine is stopped. being a controller;
Vehicle characterized in that it is included.
The vehicle of claim 12 , wherein the controller includes a torque base map that calculates the fuel injection amount by applying the engine torque just before the start-off is off.
The method according to claim 13, wherein the torque base map is provided with an RPM torque reduction map, and the RPM torque reduction map uses a torque reduction curve based on the idle torque amount just before starting off below the idle rotation speed (Idle rpm) of the engine, , wherein the torque is constructed as an RPM-torque table calculated by multiplying the idle torque before the start-off by a ratio.
The method according to claim 13, wherein the torque base map is provided with a TIME torque reduction map, the TIME torque reduction map uses a torque reduction curve based on the amount of idle torque just before starting off using a time delay, and the torque is idle before starting off A vehicle, characterized in that it is built with a TIME-torque table calculated by multiplying torque by a ratio.

Images