JPH0949450A - Fuel control device for engine in vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent smoking of a spark plug caused by an fuel increase after start, when transported a vehicle from a plant to a dealer. SOLUTION: A spark ignition engine performing an after start increase of fuel is mounted in a vehicle. At the time of transporting the vehicle from a plant to a dealer, an after start increase is reduced. Time of transport is discriminated by checking, for instance, when a backup power supply relating to a fuel controlling unit U is not inputted, when a room lamp fuse 5 is removed, when in a prescribed distance or less, when in a prescribed running time or less, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel control device for an engine in a vehicle, in which the amount of fuel is increased by a predetermined amount after starting.

[0002]

2. Description of the Related Art As represented by a gasoline engine,
In a spark ignition type engine that ignites with a spark plug, the amount of fuel is increased by a predetermined amount after the engine is started. That is, since a large amount of fuel is supplied so that it becomes extremely rich during engine start, if the control shifts to normal fuel supply immediately after start, the air-fuel ratio will suddenly become too lean and engine stall The problem of torque shock will occur, and the amount is increased after starting in order to solve such a problem (for example, Japanese Patent Laid-Open No. Hei 5).
280391).

By the way, a vehicle equipped with a spark ignition type engine is repeatedly started and stopped a considerable number of times before being delivered to the user. That is, when transporting from a vehicle manufacturing plant to a user, not only traveling in the plant but also loading and unloading on a truck or a transport ship for transportation are performed. Will be driven when.

In each of the above-mentioned transportations during transportation, since each traveling is for a short time, the engine is stopped before the engine is sufficiently warmed up, and the engine is restarted. Will be repeated.

[0005]

When the vehicle is transported and the amount of fuel is increased after the engine is started each time the engine is started, a large amount of carbon adheres to the spark plug, causing smoldering. A situation in which the spark plug is passed in a smoldered state is likely to occur. In other words, the user may feel that the engine is out of order even though the user is a new car.

Therefore, an object of the present invention is to provide a fuel control device for an engine in a vehicle, which can prevent or reduce the occurrence of smoldering in the spark plug during transportation of the vehicle.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention has the following configuration. That is, in a fuel control device for an engine in a vehicle in which a spark ignition type engine is mounted and the amount of fuel is increased by a predetermined amount after the engine is started, during the transportation of the vehicle, the amount of increase after the starting is increased. Is set so as to reduce. Preferred embodiments of the present invention based on the above configuration are as described in claims 2 to 10 in the claims.

In order to achieve the above object, the present invention has the following structure as yet another structure. That is, in a fuel control device for an engine in a vehicle in which a spark ignition type engine is mounted and the amount of fuel is increased by a predetermined amount after the engine is started, it is detected that the vehicle is being transported. A configuration is provided that includes a detection unit and a reduction unit that reduces the post-starting amount increase when the transportation detection unit detects that the vehicle is being transported.

[0009]

According to the present invention as set forth in claim 1 or claim 11, since the increase in the amount after starting is reduced during transportation of the vehicle, the amount is increased as compared with the case where the amount is increased after starting normally. Therefore, it is preferable for preventing or reducing the situation where the carbon adheres to the ignition plug and for maintaining the good condition of the engine immediately after it is delivered to the user.

By adopting the structure as described in claims 2 to 9, a concrete method for judging that it is during transportation is provided.

According to the fourth aspect of the present invention, since the backup power source of the control unit is generally cut off during transportation to reduce the power consumption of the battery, the backup power source is cut off. By seeing, it is possible to reliably detect or judge that it is during transportation.

According to the sixth aspect of the invention, and particularly the seventh aspect of the invention, in order to reduce the power consumption of the battery during transportation, a specific electric component not supported for traveling the vehicle, particularly a room lamp, is installed. Since it is common for the power supply to be cut off, by looking at the cutoff of the power supply to this specific electrical component, it is possible to reliably detect or judge that it is during transportation.

With the structure as described in claim 8, by seeing the ON state of the dedicated manual switch, it can be surely detected or judged whether or not it is during transportation.

By adopting the structure as described in claim 9, it is possible to detect or judge the relatively ambiguous state of whether or not it is during transportation with higher accuracy.

With the structure as set forth in claim 10, the post-starting amount increase for transportation and the time other than during transportation can be set individually, and the post-starting amount increase can be optimally performed. .

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the entire control system of the present invention, and the symbol U in FIG. 1 is a control unit configured by using a microcomputer. This control unit U is for performing at least fuel control,
As is known, it has a CPU, a ROM, a RAM and the like.

The control unit U receives signals from various sensors for fuel control, but in FIG. 1 only the sensors S1, S2 relevant to the invention are shown. Sensor S
Reference numeral 1 is for detecting the engine cooling water temperature, and is used for determining the startup increase amount and the post-start increase amount.
The sensor S2 detects the engine speed and is used to determine whether or not the engine has started (when the engine speed has risen to around a predetermined idle speed, it is determined that the engine has started). ). Then, the control unit U outputs a predetermined fuel injection signal to the fuel injection valve 1 as the fuel supply means.

Power from the battery 2 is input to the power input port P1 of the control unit U via the relay 3, and the relay 3 turns on the ignition switch 4.
It is turned on by. That is, relay 3
Is turned on, the control unit U can detect that the ignition switch 4 is turned on. In order to detect this, the signal of the ignition switch 4 is directly input to the control unit U. It can also be done by.

Power from the battery 2 is input to the backup power input port P2 of the control unit U, bypassing the relay 3. From the battery 2, fuse 5
It is set that power can be supplied to a room lamp (not shown) via the power supply, and battery power is supplied to the input port P3 of the control unit U via the fuse 5.

The fuse 5 is not installed at the vehicle manufacturing plant, but is installed when the vehicle arrives at the shop. That is, when there is no battery power input to the input port P3, it can be determined that the vehicle is being transported.

Next, the control contents of the control unit U will be described with reference to the flowcharts of FIGS. In the following description, Q indicates a step.

First, at Q1 in FIG. 2, it is judged if the engine is being started. This determination is made, for example, by observing whether or not the engine speed has risen to a speed near the idle speed while the starter motor is operating by the ignition switch 4.

If the result of the determination in Q1 is YES, in Q2, the post-starting increase rate is determined as described later, and then in Q3, fuel injection for starting is executed. This fuel injection for start-up is performed so as to be in an extremely rich state based on the engine cooling water temperature. However, considering the limit of the maximum injection amount of the fuel injection valve 1, simultaneous injection is performed for each cylinder ( Securing a sufficiently long valve opening time of the fuel injection valve 1).

When the determination in Q1 is NO, in Q4, the post-starting amount increase is executed according to the contents determined in Q2. At this time, the post-start increase amount is decreased by a predetermined amount K1 from the predetermined initial value, and eventually the post-start increase amount becomes zero. When the increase is reduced after the start, Q5
In, the fuel injection (fuel supply) is synchronous injection (fuel injection at the intake stroke timing of each cylinder).

The contents of Q2 are shown in FIG. In Q11 of FIG. 3, the ignition switch 4 is turned off.
The number of times N (the number of ONs from the time of factory shipment) is counted, and this count value is temporarily stored in the RAM of the control unit U.

After Q11, in Q12, the number of times the ignition switch 4 is turned on is a predetermined number of times, for example 10
It is determined whether the number is less than or equal to the number of times. If YES in the determination in Q12, it is determined in Q13 whether the battery power is input to the input port P3.

If the result of the determination in Q13 is YES, it means that it is determined that the vehicle is in transit. In this case, in Q14, the post-starting amount increase table set for transportation is selected. . After that, in Q15, a reduction coefficient K1 (corresponding to Q4 in FIG. 2) indicating the amount of decrease in the post-starting amount increase for transportation is determined. It should be noted that it is preferable to check the and of Q12 and Q13 in order to prevent a situation where the fuse 5 is disconnected during use of the user and is mistakenly determined to be in transit. .

If NO in the determination in Q12 or Q13, the process proceeds to Q17, and the post-starting amount increase table set for normal use other than transportation is selected. After that, in Q18, a reduction coefficient K1 (corresponding to Q4 in FIG. 2) indicating the amount of decrease in the post-starting amount increase other than during transportation is determined.

After Q15 or Q18, Q respectively
Move to 16 and execute post-start increase in quantity for transportation (Q15
(When shifting from Q18) or after the start for normal use is increased (when shifting from Q18).

An example of the table for Q14 or Q17 is shown in FIG. In FIG. 4, the initial value of the post-start increase amount for transportation and for normal operation is set according to the engine cooling water temperature. That is, the temperature of the cooling water is 0 ° C or less, which is extremely low, and 60 ° C when the engine is sufficiently warmed up.
In the above case, the same value is set for both transportation and normal use, but in the other predetermined temperature range, the transportation use is set smaller than the normal use.

The reduction coefficient K1 is also set in the same tendency as in FIG. That is, K1 is also set to a table (not shown), the cooling water temperature is 0 ° C. or less at which the temperature is extremely low, and the engine is sufficiently warmed up.
At 0 ° C. or higher, the values for transportation and for normal use are set to the same value, but in the temperature range other than this, the value for transportation is set to be smaller than that for normal time. The above-mentioned tables are created and stored in advance in the ROM of the control unit U (characteristic storage means).

FIG. 5 is a schematic diagram showing how the increase in amount after the start differs between during transportation and during normal operation. In FIG. 5, the post-start increase is started at time t1, the post-start increase is gradually decreased according to the reduction coefficient K1, and the post-start increase becomes zero at the time t2 (end of post-start increase). This Figure 5
In the example shown in (1), the degree of decrease determined by the initial value of the post-start increase amount and K1 is smaller during the transportation than during the normal time, and the end time of the post-start increase amount is set to be the same. Then, the amount of decrease in the increased amount after the start of the transportation, compared to the normal time, is the amount hatched in FIG.

Here, since the post-starting increase in normal time is set to a considerably large value with a margin, there is no problem even if the post-starting increase is reduced for transportation. Especially,
As shown in FIG. 4, the problem of engine stall or torque shock during transportation can be avoided by setting not to increase or decrease the amount after starting during transportation at extremely low temperature (prohibition means).

6 to 8 show another method for reducing the increase in the amount of fuel after starting during transportation. In the example of FIG. 6, the initial value of the post-start increase amount is smaller, the decrease ratio is the same, and the post-start increase amount period is shorter during transportation than during normal times.

In the example shown in FIG. 7, transportation is carried out in comparison with normal times.
The initial value of the post-starting amount increase is the same, the decrease rate is large, and the post-starting amount increase period is short.

In the example of FIG. 8, the time of transportation is higher than that of normal time.
The initial value of the post-starting amount increase is the same, the reduction rate is the same, and the post-starting amount increase period is shortened by suddenly reducing the post-starting amount increase to zero.

Here, the method (transport detection means or transport determination means) for detecting (determining) that it is during transportation may be set as follows. (1) When the traveling distance is less than a predetermined distance (for example, 10 km). (2) When the traveling time is less than a predetermined time (for example, 15 minutes). (3) Perform the determination of Q12 or Q13 independently (Q
(Judgment alone, without looking at and of Q13).

(4) When the backup power source is not input to the input port P2 of the control unit U (in transportation, the backup power source is generally disconnected from the input port P2 and is connected at the point of sale). The backup power source may be input to the control unit U via a fuse of a specific electric component such as a room lamp that does not support the traveling of the vehicle. In this case, if storage is required for the determination in FIG. Q12, etc., it may be stored using a non-volatile memory. (5) Provide a dedicated manual switch for transportation (it is turned on at the time of factory shipment and turned off at the point of sale).

(6) Instead of the room lamp fuse 5 used for the determination in Q13, it is possible to check the power supply cut-off state of an electric component, such as an audio device, which is not supported for running the vehicle. Good. (7) It is also possible to see that the vehicle is being transported by a combination of the embodiments shown in the drawings and any two or more of the methods (1) to (6).

"Means" are added to the functions of members such as steps and sensors shown in the flowcharts of FIGS.
The present invention includes expression as a superordinate concept.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing one embodiment of the present invention.

FIG. 2 is a flow chart showing a control example of the present invention.

FIG. 3 is a flowchart showing a control example of the present invention.

FIG. 4 is a diagram showing a setting example of post-start increase amount for transportation and for normal use.

FIG. 5 is a time chart schematically showing the control contents of the present invention.
G.

FIG. 6 is a diagram showing another difference setting of the post-starting amount increase for transportation and for normal use.

FIG. 7 is a diagram showing another difference setting of the post-starting amount increase for transportation and for normal use.

FIG. 8 is a diagram showing another difference setting of the post-starting amount increase for transportation and for normal use.

[Description of sign]

 1: Fuel injection valve 2: Battery 3: Relay 4: Ignition switch 5: Fuse (for room lamp) U: Control unit P2: Input port (for backup power supply)

Claims (11)

[Claims] 1. A fuel control device for an engine, comprising a spark ignition type engine, wherein the amount of fuel is increased by a predetermined amount after the engine is started. A fuel control device for an engine in a vehicle, which is set so as to reduce the increase in the amount after starting. 2. The fuel control of an engine in a vehicle according to claim 1, wherein when the traveling distance of the vehicle is equal to or less than a predetermined distance, it is set to be judged to be during the transportation. apparatus. 3. The fuel control of an engine in a vehicle according to claim 1, wherein when the traveling time of the vehicle is a predetermined time or less, it is set to be judged to be during the transportation. apparatus. 4. The vehicle according to claim 1, wherein when the backup power source for the control unit for controlling fuel is cut off, it is set to be judged to be during the transportation. Engine fuel control device. 5. The vehicle according to claim 1, wherein when the number of revolutions when the ignition switch is turned on is equal to or less than a predetermined number of revolutions, it is set to be judged to be during the transportation. Engine fuel control system in. 6. The system according to claim 1, wherein when it is detected that a fuse for an electric component that does not support the traveling of the vehicle is broken, it is determined that the transportation is in progress. A fuel control device for an engine in a vehicle characterized by the following. 7. The fuel control device for an engine in a vehicle according to claim 6, wherein the electrical component is a room lamp. 8. The manual switch according to claim 1, further comprising: a manual switch that is turned on during the transportation, and is set so that it is determined to be during the transportation when the manual switch is turned on. Fuel control device for an engine in a moving vehicle. 9. The vehicle according to claim 7, wherein the traveling distance of the vehicle is less than or equal to a predetermined distance, the traveling time of the vehicle is less than or equal to a predetermined traveling time, and the number of times the ignition switch is turned on is less than or equal to a predetermined number. A fuel control device for an engine in a vehicle, wherein when one of the two conditions is further satisfied, it is determined to be during the transportation, and the amount of increase in the amount of fuel is reduced after the engine is started. 10. The characteristic of the post-starting amount increase according to claim 1, wherein two types are set, one for a normal mode and one for a transportation mode, and the transportation mode is selected at the time of transportation and is not at the time of transportation. Is selected in a normal mode, and the fuel amount is increased after starting based on the selected transportation mode. 11. A fuel control device for an engine in a vehicle, in which a spark ignition type engine is mounted, and the amount of fuel is increased by a predetermined amount after the engine is started, when the vehicle is being transported. A fuel for an engine in a vehicle, comprising: a transportation detecting means for detecting; and a reducing means for reducing the post-start increase when the transportation detecting means detects that the vehicle is being transported. Control device