JPH03202641A - Output control method of engine - Google Patents

Abstract

PURPOSE:To properly control an output decrease quantity by determining the number of inoperative cylinders according to a slip quantity when racing takes place so as to rest those cylinders in such a case as decreasing the output of an engine when racing takes place at a driving wheel. CONSTITUTION:Racing (slip) of a driving wheel 17 is detected based on respective detected results of driving wheel speed 18 and driven wheel speed 20 by a slip detection means 25 in an ECU 12 while a vehicle is in operation so as to set target torque at which any slip is not generated at the driving wheel 17 by a target torque setting means 26. Selection for deciding which one of inoperative cylinders and throttle valve closing control should be applied to output decrease control, is performed by means of a torque control method setting means 28 according to a target torque and a preset driving torque detected by means of a driving torque detection means 27. When it is performed in form of inoperative cylinders, the number of inoperative cylinders is calculated in response to a lip quantity by means of a number of inoperative cylinder calculation means 29, and a fuel injection stop control means 31 and an ignition stop control means 32 are controlled according to the result of calculation so as to set some cylinders inoperative.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an output control method for reducing the output of an engine when a drive wheel spins.

<Prior art> Generally, when the road collapse situation changes rapidly while the vehicle is running, or when the vehicle is traveling on a slippery road such as a snowy or frozen road, the driver must take precautions to prevent the drive wheels from spinning. Adjusting the amount of depression of the accelerator pedal and delicately controlling engine output is extremely difficult, even for non-experts. Similarly, if the speed of the vehicle relative to the turning path is too high, the wheels may skid, creating a dangerous situation. In order to drive safely, advanced driving skills are required, especially in cases where the exit of the turning path cannot be seen or where the radius of curvature of the turning path is gradually becoming smaller.

For this reason, an output control (traction control) that detects the spinning state of the wheels and forcibly reduces the engine output, regardless of the amount of depression of the accelerator pedal by the driver, is considered. A vehicle has been announced that allows the user to select between driving using this traction control as needed, and normal driving in which the engine output is controlled in accordance with the amount of depression of the accelerator pedal.

Traction control methods that reduce engine output include a throttle control method that closes the throttle valve regardless of how much the accelerator pedal is pressed, a brake control method that forcibly applies the brakes, and an ignition control method that delays the ignition timing. Retard systems and A/F!J-on systems that reduce the amount of fuel relative to the amount of intake air are common.

<Problem to be solved by the invention> The conventional truck as mentioned above! The means of control had the following problems. That is, the throttle control method has poor responsiveness because the intake air amount is not immediately restricted even when the throttle valve is closed, and is expensive because it requires an independent driving means. In addition, the brake control method causes a lot of brake wear and is expensive. Furthermore, the ignition retard method and the A/FIJ-on method have a narrow output range that can be restricted, and there is a risk that the exhaust gas performance will deteriorate due to the deterioration of combustion efficiency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an engine output control method that can perform output reduction control with good responsiveness and does not increase cost.

Means for Solving the Problems> The engine output control method of the present invention for achieving the above object is an engine output control method that reduces the output of two engines when a drive wheel slips, the method comprising: The present invention is characterized in that the number of cylinders to which fuel supply is to be discontinued is determined according to the amount of idle rotation of the drive wheels, and the fuel supply is discontinued to the determined number of cylinders.

Embodiment Hereinafter, an embodiment of the method of the present invention will be explained based on intervals.

First, an outline of an engine for carrying out the method of the present invention will be explained based on FIGS. 1 and 2.

An intake 4A pipe 4 is connected to the combustion chamber 2 of the engine 1 via an intake valve 3.
The proximal end of the combustion chamber 2 is connected to the combustion chamber 2, and an exhaust pipe 6 is connected to the combustion chamber 2 via an exhaust valve 5. An air cleaner 7 is attached to the tip of the intake pipe 4, and an air cleaner element 8 is housed in the air cleaner 7.

A butterfly-type throttle valve 10 is provided in the middle of the intake pipe 4 to adjust the amount of intake air supplied into the combustion chamber 2 by changing the opening degree of the intake passage 9 formed by the intake pipe 4. 10 +! Throttle drive motor 1
1 is driven by Mw5. The throttle drive motor 11 is driven based on a command from an electronic control unit (ECU) 12, and is linked to an accelerator pedal (not shown).

A spark plug 13 is provided in the combustion chamber 2 of the engine 1,
The ignition timing of the spark plug 13 is controlled by 1tiII based on a command from the ECU 12. Also, intake 1! An injector 14 for fuel injection is provided at r4, and the injector 1
4 is provided for each intake pipe 4 of each cylinder, and the basic drive time is controlled based on commands from the ECU 12.

ECU 12 is the engine control computer (
FCC) 15 and a traffic control computer (TCC) 16, and a throttle drive motor 11.
The drive command is output from TeCl6, and the spark plug 13
A drive command for the injector 14 is output from the ECCl3. Detection signals from a driving wheel speed detection sensor 18 that detects the rotational speed of the driving wheel 17 and a driven wheel speed detection sensor 20 that detects the rotational speed of the driven wheel 19 are input to the TCC 16 .

Engine information 21 such as cooling water temperature and intake air amount is input to ECCl3. Further, the drive signal 22 of the throttle drive motor 11 is inputted to TeCl4 from ECCl3, and the ignition stop signal 23 of the spark plug 13 is input to ECCl3.
and the fuel injection stop signal 24 of the injector 14 is TeC
Input from l4.

The control block of the ECU 12 will be explained based on FIG.

The slip detection means 25 detects slippage of the drive wheels 17 based on signals from the drive wheel speed detection sensor 18 and the driven wheel speed detection sensor 20. The target torque setting means 26 sets a torque at which no slip occurs on the driving wheels 17, and the driving torque detecting means 27 detects the current driving torque. The torque control method setting means 28 selects, depending on the target torque and the drive torque, whether to perform the output reduction control using the cylinder that stops fuel supply or by closing the throttle valve 10 and reducing the intake air amount. The number of cylinders in the body cylinder calculation means 29 calculates the number of cylinders to be made in the body according to the amount of slip, and the target throttle opening degree calculation means 30 calculates the number of cylinders to be made in the body according to the amount of slip.
Calculate the opening degree of 0. The fuel injection stop @ control means 31 performs control to stop the fuel injection of the injector 14 of the cylinder that performs the cylinder operation, and the ignition stop control means 32 performs control to stop the ignition of the spark plug of the cylinder that performs the cylinder operation. The throttle valve drive means 33 drives the throttle drive motor 11 so that the opening of the throttle valve 10 corresponds to the target throttle opening.

Next, an embodiment of the output control method of the present invention will be described based on FIG.

As shown in FIG. 3 (al), in step S1, the driving wheel speed 2 is detected by the driving wheel speed detection sensor 18, and the driven wheel speed vP is detected by the driven wheel speed detection sensor 20.
The slip amount D of the driving wheels 17 is calculated based on the driving wheel speed vF and the driving wheel speed vF.
Calculate V (V, -VFl). In step S2, it is determined whether the slip amount Dv is larger than the body cylinder judgment slip amount D, and if the slip amount Dv is small, the body cylinder control is stopped (the number of body cylinders is set to zero), and the body cylinder control flag is OFF
If the slip amount DV is large, the routine moves to the cylinder control routine shown in Fig. 3 (bl).After stopping the cylinder control,
In step 8, it is determined whether the slip amount Dv is larger than the throttle control judgment slip amount DvTH, and if the slip amount DV is small, the throttle control is ended and the process returns to step S. If the slip amount Dv is large, The process moves to the throttle WIJrIII routine shown in FIG. 3 (cl).

As shown in FIG. 3(b), after it is determined in step S2 that the slip amount Dv is large, the number Ncyl of cylinders in the body is calculated based on the step amount DV, and the number of cylinders corresponding to the calculated number of cylinders is calculated based on the step amount DV. The fuel injection by the injector 14 of the cylinder is stopped, and the ignition of the spark plug 13 is also stopped to perform the cylinder injection, and the process moves to step S3 shown in FIG. 3 (al). The calculation is performed based on the map shown in Fig. 4.In other words, the number N of cylinders with respect to the slip scale is set with a slight hysteresis h for increasing and decreasing cases, and is adjusted according to various situations. The number N0 of cylinders in the body is calculated in accordance with the slip measurement.

In other words, when a slip occurs in the driving wheel 17, the cylinder is immediately shifted using the number of cylinder cylinders Ney corresponding to the slip amount Dv. Therefore, even if the drive wheels 17 slip, the drive torque can be reduced by an optimal reduction amount with good responsiveness.

As shown in Fig. 3 (cl), after it is determined that the slip amount Dv is large in step S3, the vehicle body acceleration GV is calculated from the driven wheel speed ■8, and the target The vehicle body driving torque TvT0 is calculated, and the target engine torque TET0 is calculated from the target vehicle body driving torque TvT6 and the reduction ratio R6.In step S6, it is determined whether the body cylinder flag is ON or not. is released), in step S7, the target throttle opening θT6 is calculated based on the map shown in FIG. The target throttle opening degree is controlled to θ76 and the process returns to step S in FIG. 3 fa). Step S6
If the body cylinder flag is determined to be ON, the number of cylinders in the body N
The target engine torque TI: 1° is corrected based on , and the process moves to step S7. Target engine torque TETG
The correction is performed by dividing the number of cylinders NALL by the number of cylinders N and multiplying the divided value by the target engine torque TET (i) before correction.

By executing this, it is possible to finely control the drive torque only by throttle control after the cylinder is finished.

Here, a method for calculating the target engine torque T[T(1) will be explained.

■ Vehicle speed v7 from driven wheel speed V8 and wheel radius 9 (1)
Calculated using the formula.

V = V

cV= d VV/ d t (21■ From vehicle acceleration Gv and vehicle weight Mv, target vehicle body drive torque TVT
0 is calculated using equation (3).

T=MXG (3) However, Mv is set in advance, or detected by a suspension sensor, air pressure sensor, etc.

■Target vehicle drive torque T, transmission VTG%, cushion reduction ratio ρ, and differential reduction ratio ρ. (
Reduction ratio R, )) Lux converter torque ratio t (A/T
In this case), the target engine torque TETG is calculated using equation (4).

TETG=TvTG/(ρwork×ρ. Find the torque converter input/output shaft speed ratio from the number and vehicle speed, and determine it based on the memory table.

On the other hand, the body cylinder judgment slip amount D and the throttle ffIT
In order to obtain the actual driving torque for determining the lfIIJ judgment slip amount D, is it directly detected with a torque sensor installed on the output shaft of the transmission, or is it calculated based on a memory table from the intake air amount and engine speed? , or inversely calculate the above-mentioned equation (4).

According to the above-mentioned output control method, when the near drive wheel slips, the number of cylinder cylinders Nc corresponds to the slip amount DV, so that the cylinder cylinder number Nc is adjusted to provide good responsiveness and the optimum amount of reduction. The driving torque can be reduced. Furthermore, since the drive torque is finely controlled only by throttle control after the cylinder is finished, smooth output reduction control can be performed.

In the above embodiment, the number of cylinders Nc in the body according to the slip amount Dv is calculated based on the map shown in FIG. It is also possible to calculate the cylinder cylinder N. A method for calculating the number of cylinders in the body, Neil, will be explained below.

First, the target engine torque T is determined based on the slip amount DV.
! Calculate T0 and calculate the loss torque TLos from the cooling water temperature Tu and engine speed N4 based on the map shown in Fig. 6.
G is determined, and further, the actual drive torque TNo is determined using, for example, a torque sensor. From each torque value, determine the number of cylinder air gaps N using the following formula (II).

N=INT(", yl"' NOW "ETQ"" N
CLI-TLOIIS)'''However, INT is a coefficient for converting into an integer, T'8°.

is the drive torque considering the current number of cylinders, and from the above formula 0, the number N of cylinders and cylinders is calculated, and the number N of cylinders corresponding to the slip amount Dv is obtained. It is impossible to prevent a decrease in acceleration, a feeling of stalling, and a decrease in slip yield due to insufficient body cylinders.

In addition, as another calculation method, drive torque TNo.

Instead, use the unit intake air amount (amount of air taken in one revolution of the engine) A/N and use the following formula (111 to calculate the number of cylinders in the body N
It is also possible to calculate

N = I N T (N ay , X (A/N
how'/Nrqar/"Nsow""""However,
A/NN OW is current A/N, A/NT, qGT
is the target A/N, and A/NTFIG T is the target engine torque T! based on the map shown in Figure 7. T, and the engine speed NE.

According to the above-mentioned output control method, when the drive wheels 17 are idling, the number of cylinders is adjusted according to the amount of idling.
Output fl with good responsiveness and appropriate torque reduction
+lJa! can be done.

Furthermore, since the drive torque is finely controlled only by throttle control after the cylinder is finished, smooth output reduction control can be performed.

<Effects of the Invention> According to the engine output control method of the present invention, when the drive wheels are idling, the number of engine cylinders is determined according to the amount of idling, and the engine engine output control method is performed at the determined number of WI, so that the response is improved. Not only can the output be controlled efficiently, but also the amount of output reduction can be appropriately controlled. As a result, there will be no reduction in acceleration or stalling feeling due to an excess of body cylinders, and there will be no reduction in idling speed due to a lack of body cylinders.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an engine implementing the method of the present invention;
Figure 2 is a control block diagram, Figure 3 is a flowchart of an output control method according to an embodiment of the present invention, Figure 4 is a map for determining the number of cylinders in the body, and Figure 5 is a map for determining the target throttle opening. Fig. 6 is a map for calculating the loss torque, and Fig. 7 is a map for calculating the target unit intake air amount. In the drawing, 1 is an engine, 4 is an intake pipe, 10 is a throttle valve, and 12 is an ECU. 14 is an injector, 15 is an engine control computer, 16 is a tractor engine control computer, 17 is a driving wheel, 18 is a driving wheel speed detection sensor, 19 is a driven wheel, and 20 is a driven wheel speed detection sensor.

Claims (1)

[Claims] An engine output control method for reducing engine output when a driving wheel is idling, the method comprising: determining the number of cylinders to which fuel supply is to be stopped according to the amount of idling of the driving wheels; 1. A method for controlling the output of an engine, characterized in that the supply of fuel is stopped for several times.