JPH0561458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to means for suppressing overspeeding of a vehicle driven by a fuel-injected internal combustion engine.

[Prior art] When a vehicle is running, excessive speed may cause engine damage or a serious traffic accident.
It is desirable to have a means to automatically suppress this. For this reason, conventional measures have been taken to suppress the speed by cutting fuel from all cylinders when the speed detection means detects that the speed limit has been exceeded.

[Problem] By the way, the speed limit for regular cars is 180 km/h, so if the car were to travel at such a high speed, the above-mentioned measures would be unavoidable. However, the speed limit for light vehicles is 110
Km/h, and compared to the speed limit for regular cars,
The speed is quite low, and on actual highways, there are many possibilities or opportunities for vehicles to travel at speeds higher than the 110 km/h regulation speed due to overtaking other vehicles or other traffic conditions.

In this way, in the case of a light vehicle, the speed is 110km/h,
In the case of a small car, if fuel is cut from all cylinders at a speed of 180 km/h or lower, such as 160 km/h or 140 km/h, the torque will fluctuate rapidly, which may even increase the risk of an accident. It will bring.

Incidentally, a speed control method using fuel cut has already been proposed in Japanese Patent Application Laid-Open No. 59-211732 and unpublished Japanese Patent Application No. 59-234065, but it does not fully solve the problem.

[Object of the Invention] Therefore, an object of the present invention is to provide means for suppressing the output of the engine to prevent sudden torque fluctuations when the vehicle exceeds the speed limit.

[Solution Means] In order to achieve this object, the present invention is equipped with a three-cylinder engine in which fuel is injected into each cylinder by an injector, and a vehicle speed sensor that detects the speed of the vehicle generates a detection signal that exceeds a set speed. In a speed control device for a vehicle, the speed detection signal from the vehicle speed sensor is input, and the speed detection signal from the vehicle speed sensor is input, and the speed detection signal from the vehicle speed sensor is input. The first speed is compared with the set speed which is the judgment value of 1.
a comparison determination means; an engine rotation speed detection means for detecting the engine rotation speed after a predetermined set time has elapsed from the input of the set speed excess signal when the set speed excess signal exceeding the set speed is input; Stores the engine speed, which is the second judgment value obtained by multiplying the engine speed at the set speed by the set premium rate.
RAM means; and second comparison/judgment means for comparing the engine speed detected by the engine speed detecting means, the engine speed at the set speed, and the engine speed stored in the RAM means; When a set speed excess signal exceeding the set speed is input to the comparison and determination means, the engine rotation speed after the set time exceeds the set time by the engine rotation speed detection means is determined by the second comparison and determination means to be equal to or higher than the engine rotation at the set speed, and If it is determined that the engine rotational speed is less than the engine rotational speed stored in the RAM means, the fuel supply of the set one cylinder is cut off or thinned out, and the engine rotational speed after the elapse of the set time is determined to be the engine rotational speed stored in the RAM means. The present invention is characterized in that a computer is configured to suppress or control the speed of the vehicle by cutting off or thinning out fuel supply to two or more cylinders when it is determined that the rotation speed is higher than or equal to the rotation speed.

[Operation] The speed control device according to the present invention does not immediately cut off the fuel supply when the vehicle speed exceeds the set (regulated) speed, but instead reduces the engine rotational speed when the speed exceeds the regulated speed for a set period of time. The fuel supply is cut off or thinned out depending on the degree of overspeeding, but if the engine speed at that time is lower than the engine speed multiplied by the regulated speed by a certain premium rate, the excess speed is small.
By cutting off or thinning out the fuel supply to only one cylinder, the speed is weakly suppressed.If the rotation speed is high, the overspeeding is also large, so by cutting off or thinning out the fuel supply to two or three cylinders, the speed is strongly suppressed. It is a restraint.

Note that speed information is input to the computer every moment, so if the speed becomes lower than the regulated speed, it goes without saying that the original state will be restored and fuel will be supplied to all cylinders.

[Embodiments] The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a system diagram of the speed control device, FIG. 2 is a flowchart of the speed control means, and FIG. 3 is a schematic block diagram of the speed control device. In Figure 1,
1 indicates the cylinder of the engine, and in the embodiment, a 3-cylinder engine will be described, but a 2-cylinder or 4-cylinder engine will be described.
The present invention can also be applied to electronically controlled fuel injection type engines with two or more groups of multi-point injection, such as cylinder engines.

Fuel is sent from the fuel tank 6 by the fuel pump 5, injected into the intake pipe by the injector 8, sucked into the cylinder 1, ignited by a spark from the ignition coil 10, and combusted.
Generates driving force. An air flow meter 9 is provided in the air supply path, and a pressure regulator 7 is provided in the fuel system that operates differentially depending on the negative pressure in the intake pipe. The computer 3 uses the battery 2 as a power source, and also receives information from the speed meter 4.

The computer 3 includes a first comparison/judgment means for inputting a speed detection signal from a vehicle speed sensor and comparing it with a set speed, which is a first judgment value set in advance, and a set speed excess signal that exceeds the set speed. an engine rotation speed detection means for detecting the engine rotation speed after a predetermined set time has elapsed from the input of the set speed excess signal; and a second judgment value that is obtained by multiplying the engine rotation speed at the set speed by a set premium rate. RAM means for storing the engine rotation speed at which the engine rotation speed is set; and the engine rotation speed detected by the engine rotation speed detection means and the engine rotation speed at the set speed.
a second comparison/judgment means for comparing the engine rotational speed stored in the RAM means, and the engine rotational speed detection means when a set speed excess signal exceeding the set speed is input to the first comparison/judgment means. The engine rotation speed after the set time has elapsed is the second
If the comparative determination means determines that the engine rotation speed is equal to or higher than the set speed and lower than the engine rotation speed stored in the RAM means, the fuel supply to the set one cylinder is cut off or thinned out, and after the set time has elapsed. Engine speed is above
If it is determined that the engine rotation speed is equal to or higher than the engine rotation speed stored in the RAM means, the fuel supply to two or more cylinders is cut off or thinned out, and the speed of the vehicle is suppressed and controlled.

More specifically, as shown in FIG. 3, the computer 3 includes a first comparison and determination means, a RAM means,
The computer 3 is connected to a speed meter 4 as a vehicle speed sensor, an engine rotation speed detection means including an ignition coil 10, a fuel pump 5, and an injector 8, respectively.

Further, when a preset speed exceeds a preset speed of 110 km/h from the speed meter 4, the computer 3 receives a preset speed excess signal that is determined by the first comparison/determination means. The engine rotation speed (Ne ₂ ) is detected after a predetermined set time, for example, 3 seconds, has elapsed since the input of the excess signal.

Then, if the engine rotation speed (Ne ₂ ) is equal to or higher than the engine rotation speed (Ne) at the set speed of 110 km/h in the second comparison determination means, a set premium is added to the engine rotation speed (Ne) at the set speed of 110 km/h. If the engine speed is less than a value different from the set speed (Ne ₁ ) calculated by multiplying the speed by 1.05, for example, 5% increase, the fuel supply to the set one cylinder is cut off or thinned out, and the If the engine speed (Ne ₂ ) is equal to or higher than the engine speed (Ne ₁ ) calculated by multiplying the set premium rate, a function is activated to control the fuel supply to two or more cylinders, for example, to cut off or thin out the fuel supply to two or more cylinders. have

As shown in the flowchart of Fig. 2, the computer 3 receives the speed V from the speed meter 4 at 110 km/h.
Information on whether the value is greater than or equal to h or less than h is input.

If it is less than that, no vehicle speed regulation action is necessary, and the process returns to the original state and waits for the next input of vehicle speed information.

If the vehicle speed is 110 km/h or more, assign the rotation number, and if it is the first time, calculate the engine rotation speed Ne ₁ , which is 5% higher than the engine rotation speed Ne obtained from the ignition coil 10 etc., using the computer. of
Store it in RAM.

For example, if the vehicle speed V is 110 km/h or more,
If it continues for seconds, the input value of the rotation speed Ne ₂ at that time is compared with the previously memorized value of Ne ₁ , and if the current rotation speed Ne ₂ is smaller than Ne ₁ , fuel is supplied to only one cylinder. Cut off or thin out.

If Ne ₂ is greater than Ne ₁ , the fuel supply to two or three cylinders is cut off or thinned out. Vehicle speed is 110
As long as the speed is at least Km/h, the above speed control is performed.

When the vehicle speed is less than 110 km/h, the fuel supply is not cut off or thinned out, and the vehicle enters a normal driving state.

As described above, in this embodiment, if the speed exceeds the speed limit, the engine speed signal alone is used to cut off or thin out the fuel supply and control the speed. After 3 seconds, when the overspeed rate is small, the fuel supply is cut off or thinned out at a small rate, and when the overspeed rate is high, the fuel supply is cut off or thinned out at a large rate.

As a result, the first judgment value, the set speed 110
When a set speed over-speed signal exceeding Km/h is input, the operating state is determined again based on the engine rotation speed (Ne ₂ ) after 3 seconds has elapsed without simply cutting the fuel, and the operating state is determined. It is possible to perform detailed control according to the situation, which is advantageous in practice.

In addition, when the present application is applied to a light vehicle that does not have sufficient engine power in the speed range where vehicle speed limit control operates due to underpower, two judgment values will indicate that the ON-
It is possible to reliably avoid the occurrence of the so-called hunting phenomenon in which the vehicle is turned off, and it is possible to realize smooth vehicle speed limiting control and improve drivability.

Note that the premium rate for the rotational speed Ne ₁ is not limited to 5%, and may be set to an appropriate rate. Further, the delay time is not limited to 3 seconds, and may of course be set to an appropriate time in consideration of the required overtaking time and other driving conditions.

Note that the cutoff or thinning of fuel supply according to the present invention can be applied to one cylinder of a two-cylinder engine, or one or two cylinders of a four-cylinder engine, as a means for suppressing speed overs without sudden torque fluctuations. can.

[Effects of the Invention] As explained above, according to the present invention, when the vehicle speed exceeds, if the rate of exceedance is small, the fuel supply is cut off or thinned out for only one cylinder to prevent large torque fluctuations. If the ratio is large, the fuel supply to two or more cylinders is cut off or thinned out to strongly suppress the speed. As a result, except in cases of abnormal overspeeding, the speed is suppressed while preventing large torque fluctuations, thereby contributing to accident prevention.

In addition, if it is used in a light vehicle that does not have enough engine power in the speed range where vehicle speed limit control operates due to underpower, the so-called hunting phenomenon will occur, where the engine turns on and off at the set speed depending on two judgment values. This makes it possible to reliably avoid such problems, realize smooth vehicle speed limiting control, and improve drivability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a speed control device showing an embodiment of the present invention, FIG. 2 is a control flowchart of the speed control device, and FIG. 3 is a schematic block diagram of the speed control device. In the figure, 1 is the engine cylinder, 3 is the computer, 4 is the speed meter, 5 is the fuel pump,
8 is an injector, and 10 is an ignition coil.

Claims (1)

[Claims] 1 The vehicle is equipped with a three-cylinder engine in which fuel is injected into each cylinder by an injector, and when a detection signal exceeding a set speed is input from a vehicle speed sensor that detects the speed of the vehicle, the fuel supply by the injector is cut off. In the speed control device for a vehicle, the speed detection signal from the vehicle speed sensor is inputted and compared with an established speed, which is a first determination value, which is set in advance. and engine rotation speed detection means for detecting the engine rotation speed after a predetermined set time has elapsed from the input of the set speed excess signal when the set speed excess signal exceeding the set speed is input; A RAM means for storing an engine speed which is a second judgment value obtained by multiplying the engine speed by a set premium rate; and a RAM means for storing the engine speed detected by the engine speed detection means, the engine speed at the set speed, and the RAM means. a second comparison/judgment means for comparing the stored engine rotation speed, and when a set speed excess signal exceeding the set speed is input to the first comparison/judgment means, the set time is determined by the engine rotation speed detection means. When the second comparison and determination means determines that the engine rotational speed after the lapse of time is equal to or higher than the engine rotational speed at the set speed and less than the engine rotational speed stored in the RAM means, the fuel supply to the set one cylinder is performed. If it is determined that the engine rotational speed after a set time has elapsed is equal to or higher than the engine rotational speed stored in the RAM means, the fuel supply to two or more cylinders is cut off or thinned out, and the speed of the vehicle is reduced. A speed control device for a fuel injection vehicle, characterized by comprising a computer that performs suppression control.