JPH02294533A - Fuel supply control device of internal combustion engine - Google Patents

Abstract

PURPOSE:To increase response characteristic in accelerated turning by consisting a device of a means for calculating the correction amount of supplied oil according to signals from the turning condition detector means of a vehicle and a throttle opening increasing ratio computing means, a means for calculating the fuel supply amount according to signal from the correction amount computing means and basic fuel supply amount, and a fuel supply means. CONSTITUTION:The increasing ratio of a throttle opening is calculated by an increasing ratio computing means 45 according to signals from the throttle opening sensor 42 of an engine, and the turning condition of a vehicle is detected according to signals from a turning condition detector means 41. These outputs from the detector means 41 and the computing means 45 are received by a correction amount computing means 44, and the correction amount computing means 44 calculates the increased correction amount of fuel to be supplied to the engine. In addition, a fuel supply amount computing means 53 calculates the supply amount of fuel by the use of the basic supply amount of fuel, calculated according to the output from an operating condition detector means 40 in which the operating state of the engine is detected, and the output from the correction amount computing means 44. A specified amount of fuel is supplied to the engine from a fuel supply means 46 according to the output from the fuel supply amount computing means 43.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fuel supply control device for an internal combustion engine that adjusts the amount of fuel supplied to the engine in accordance with the running condition of a vehicle.

Conventional technology Normally, the amount of fuel supplied to a vehicle engine is controlled so as to vary depending on the driving condition of the vehicle. According to Service Bulletin No. 583 (Introduction of R31 series vehicles), the following control means is disclosed. That is, the basic injection fflTP is determined by an air flow meter that detects the intake air amount to the engine, a crank angle sensor that detects the engine speed, etc., and the basic injection amount and fuel mixture ratio are determined according to various driving conditions of the vehicle. I am trying to correct it. These various driving conditions include, for example, when starting, warming up, accelerating, and under high load, and the basic injection amount is corrected as appropriate based on signals obtained from sensors that detect these various driving conditions. .

For example, when starting a vehicle, it detects that the cooling water is at a low lag and increases the injection amount above that of a normal fuel injection claw, while when accelerating the vehicle, the amount of accelerator pedal operation or the throttle valve is increased. The acceleration state is detected from the change in opening degree, and the fuel injection amount is increased.

Furthermore, when the vehicle accelerates rapidly, the intake amount of fuel gas also increases rapidly, so in addition to the above correction, an acceleration interrupt injection means is implemented. This acceleration interrupt injection means detects that the throttle valve opening is large from the on/off signal of the throttle switch attached to the throttle valve, and further increases the fuel injection amount to improve the acceleration performance of the vehicle. This is a way to increase it.

Such adjustment of the fuel injection amount is controlled using an electronic engine central control system.

Problems to be Solved by the Invention However, in such a conventional fuel supply control device, the operating amount of the accelerator pedal or the throttle valve is used as means for correcting the basic injection amount during acceleration and as means for interrupting injection during sudden acceleration. The acceleration state of the vehicle is detected from the change in the opening degree of the basic injection i based on this detection signal.
Since the amount of 1 T P was increased and interrupt injection was performed, there was a problem that the response characteristics of the engine when the vehicle was turning were not necessarily sufficient.

In other words, although the output characteristics of the engine require higher response characteristics when the vehicle is turning than when the vehicle is traveling straight, the means for correcting the fuel injection amount during acceleration provides a , Since the amount of correction is always constant regardless of whether the vehicle is driving straight, it cannot be said that the acceleration performance when the vehicle turns is necessarily in line with the driver's wishes, and it does not satisfy the drive feeling especially when driving at high speed turns. There wasn't.

Therefore, an object of the present invention is to solve the problems that conventional fuel supply control devices have and to improve the response characteristics of the engine by increasing the amount of fuel supplied when the vehicle turns and accelerates. It is something to do.

Means for Solving the Problems In order to achieve the above object, the present invention first provides turning state detection means for detecting a turning state of a vehicle;
an increase rate calculation means for calculating an increase rate of the throttle angle based on a signal from a throttle opening sensor of the engine; and an increase in fuel supplied to the engine based on the output from the turning state detection means and the output from the increase rate calculation means. A correction amount calculating means for calculating a correction amount, an operating state detecting means for detecting the operating state of the engine, a basic supply amount of fuel calculated based on the output of the operating state detecting means, and an output of the correction amount calculating means. a fuel supply amount calculation means for calculating the fuel supply amount from;
and a fuel supply means for supplying fuel to the engine based on the output of the fuel supply amount calculation means,
According to claim 2, in the fuel supply control device that adjusts the fuel supply to the engine according to the running condition of the vehicle, the throttle valve is arranged in the intake passage of the engine, and , a steering angle sensor is disposed on the steering wheel, and from the increase rate of the throttle valve opening detected by the throttle opening sensor and the magnitude of the steering wheel steering angle detected by the steering angle sensor. The configuration is such that the cut-in fuel supply amount to the engine during turning acceleration is determined.

According to the structure of claim 1, the increase rate calculation means calculates the increase rate of the throttle opening based on the signal of the throttle opening sensor of the engine, and the increase rate of the throttle opening of the vehicle is calculated based on the signal of the turning state detection means. When a turning condition is detected,
In response to the output from the turning state detection means and the output from the throttle opening increase rate calculation means, a correction amount calculation means calculates an increase correction amount of fuel supplied to the engine. Further, the fuel supply amount calculation means calculates the fuel supply amount from the basic fuel supply amount calculated based on the output of the operating state detection means for detecting the operating state of the engine and the output of the correction amount calculation means. A predetermined amount of fuel is supplied to the engine from the fuel supply means based on the output of the fuel supply amount calculation means.

Further, according to the configuration of claim 2, the increase rate of the throttle valve opening is detected by the throttle angle signal obtained from the throttle opening sensor, and at the same time, the steering angle signal obtained from the steering angle sensor is detected. The magnitude of the steering angle applied to the wheel is detected, and the interrupt injection amount during turning acceleration of the vehicle is determined from the increase rate of the throttle valve and the magnitude of the steering angle.

In other words, the interrupt injection amount is controlled to be larger when the vehicle is accelerating in a turn than when it is accelerating straight ahead, and as a result, the responsiveness of the engine during acceleration in a turn is enhanced. Effect can be obtained.

Embodiment Hereinafter, an embodiment of the fuel injection control device according to the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram for explaining the basic concept of the present invention, in which reference numeral 40 indicates operating state detection means for detecting the operating state of the engine, and reference numeral 41 indicates turning state detection means for detecting the turning state of the vehicle. ．． 42 is a throttle opening sensor attached to the engine.

Reference numeral 45 denotes an increase rate calculation means for calculating the increase rate of the throttle opening based on the signal from the throttle opening sensor 42, and 44 calculates the increase rate of the engine from the output from the turning state detection means 4l and the output from the increase rate calculation means 45. 43 is a fuel supply amount calculation means for calculating the amount of fuel supplied to the engine based on the outputs from the operating state detection means 40 and the correction amount calculation means 44; , 46 is a fuel supply means for supplying fuel to the engine based on the output of the fuel supply amount calculation means 43.

According to this configuration, the rate of increase in the throttle opening is calculated by the increase rate calculating means 45 based on the signal from the throttle opening sensor 42 of the engine, and the turning state of the vehicle is calculated based on the signal from the turning state detecting means 4l. is detected,
In response to the output from the turning state detection means 4l and the output from the throttle opening increase rate calculation means 45, a correction amount calculation means 44 calculates an increase correction amount of fuel supplied to the engine.

Further, the fuel supply amount calculating means 43 calculates the fuel supply amount based on the basic fuel supply amount calculated based on the output of the operating state detecting means 40 that detects the operating state of the engine and the output of the correction amount calculating means 44. Based on the output of the fuel supply amount calculation means 43, a predetermined amount of fuel is supplied from the fuel supply means 46 to the engine.

FIG. 2 is a schematic diagram showing a specific example of the present invention. In the figure, 1 is an electronic engine centralized control unit (hereinafter simply referred to as controller I). The signal detected by the sensor is input, and as described above, a signal for correcting the basic injection amount TP is calculated according to the basic injection amount TP and various driving conditions, and the obtained fuel injection amount control signal 30 is applied to the engine. 20 is transmitted to the fuel injection valve 3 located close to the fuel injection valve 20 .

First, the basic input signals to the controller l will be explained. That is, 5 is an engine start signal from a key switch (not shown), 7 is a battery voltage detection signal, 9 is a transmission neutral signal, 1l is a vehicle speed signal, and 13 is a water temperature signal detected by the cooling water temperature sensor l3a. , 15 is a crank angle signal detected by a sensor built into the distributor 15a, 17 is an intake air amount signal detected by an air flow meter 17a placed near the air cleaner 18, and 21 is placed in the exhaust passage 24. O is the sensor output signal detected by the sensor 21a. Incidentally, reference numerals 25 and 27 are monitor check lamps for notifying the driver of the operating status of the controller 1.

Furthermore, in the case of the present invention, in addition to the above configuration, a throttle opening sensor 35a is disposed in the intake passage 22, and the throttle opening signal 35 detected by the throttle opening sensor 35a is manually input to the controller l. In addition, a steering angle sensor 36a is disposed on a steering wheel (not shown), and a steering angle signal 36 detected by the steering angle sensor 36a is similarly input to the controller 1.

According to this configuration, the basic injection amount TP for the fuel injection valve 3 is determined by the intake air amount signal 17 detected by the air flow meter 17a, the crank angle signal 15 detected by the sensor built in the distributor 15a,
In other words, it is determined by the engine speed and the like.

In addition, the starting state of the engine is detected by the water temperature sensor 13a, and the injection amount is increased as the water temperature becomes lower.
After starting, the injection amount is corrected to zero at a constant rate. Furthermore, the injection amount is adjusted in accordance with the magnitude of the vehicle speed detected by the vehicle speed signal 11.

Further, the fuel injection amount is repeatedly increased and decreased based on the air-fuel ratio rich and lean signals obtained from O detected by the sensor 21a and the sensor output signal 2l. That is, the monitor check lamps 25 and 27 are connected to the Ot sensor 21.
It is used as a monitor of the detection state of a and a monitor of the air-fuel ratio feedback correction coefficient.

Furthermore, in the present invention, in addition to the above control means, the increase rate (X) of the throttle valve opening e is detected by the throttle opening signal 35 obtained from the throttle opening sensor 35a, and at the same time, the increase rate (X) of the throttle valve opening e is detected by the throttle opening signal 35 obtained from the steering angle sensor 36a. The magnitude of the steered angle (θ) applied to the steering wheel is detected by the steered angle signal 36, and the vehicle is determined based on the increase rate (x) of the throttle valve and the magnitude of the steered angle (θ). Interrupt injection during turning acceleration! (Y) is determined.

FIG. 3 is a graph showing an example of control for determining the above-mentioned interrupt injection amount (Y) during turning acceleration, and graph ■ in the figure indicates when the vehicle is traveling straight, that is, when the turning angle of the steering wheel ( θ) is 0, and the interrupt injection amount Y = fo(x) is shown in relation to the rate of increase in the throttle valve opening, and the graph ■ in the figure indicates when the vehicle is turning, that is, when the steering wheel is rotated. It shows the interrupt injection amount Y=f, (x) with respect to the increase rate of the throttle valve opening when the steering angle is θ. Arrow A in the figure indicates the direction in which the turning angle of the steering wheel increases.

As shown in the above graph ■■, in the present invention, the interrupt injection amount is controlled to be larger when the vehicle is in a turning acceleration state than when the vehicle is in a straight acceleration state. Since the fuel injection amount control signal 30 is transmitted to the fuel injection valve 3, it is possible to improve the responsiveness of the engine 20 during turning acceleration.

Considering the above effects, for example, in the case of a rear-wheel drive vehicle, when the vehicle turns and accelerates, the force applied to the accelerator pedal increases the driving force of the rear wheels to change the cornering force, and also changes the cornering force of the front wheels by operating the steering wheel. I'm trying to find a balance. In this case, the response time for changing the cornering force of the front wheels based on the steering wheel tQ operation is extremely fast, whereas the response time for changing the cornering force of the rear wheels based on the depression force of the accelerator pedal is generally slow. This is because the driving force for the rear wheels is transmitted to the rear wheels via the engine, transmission, differential, etc., which are connected to the operation of the accelerator pedal.In other words, when the driver presses the accelerator pedal while turning, In this case, it takes extra time to determine whether or not the amount of depression is sufficient for the vehicle to accelerate in a turn, and this is the cause of the poor response characteristics of the vehicle during acceleration in a turn as described above. .

On the other hand, in the case of the present invention, as described above, the interrupt injection amount during turning acceleration of the vehicle is determined immediately from the increase rate of the throttle valve and the magnitude of the turning angle of the steering wheel. This eliminates the phenomenon of delay in the response characteristics until the cornering force of the wheels changes, resulting in the effect that the maneuverability of the vehicle is enhanced. This phenomenon is noticeable when turning at high speeds, especially when driving in a tail slide.

In the above embodiment, the explanation was given based on an example in which the amount of fuel is increased as a factor for determining interrupt injection 1 (Y) during turning acceleration, but other factors may include, for example, whether to increase the amount of both intake air and fuel, Alternatively, the same effect can be obtained by using means such as controlling the ignition advance angle of the engine 20 or controlling the exhaust gas recirculation amount (EGR↑).

Furthermore, it is also possible to detect the turning state of the vehicle based on the turning angle of the steering wheel and the vehicle speed signal It.

Effects of the Invention As described in detail above, according to the fuel supply control device for an internal combustion engine according to the present invention, first of all, according to claim 1, there is provided a turning state detection means for detecting a turning state of a vehicle, and a throttle opening of the engine. an increase rate calculation means for calculating an increase rate of the throttle opening degree based on the sensor signal; and an increase correction amount of the fuel supplied to the engine is calculated from the output from the turning state detection means and the output from the increase rate calculation means. A correction amount calculating means, an operating state detecting means for detecting the operating state of the engine, a basic fuel supply amount calculated based on the output of the operating state detecting means, and a fuel supply amount from the output of the correction amount calculating means. and a fuel supply means for supplying fuel to the engine based on the output of the fuel supply amount calculation means. In a fuel supply control device that adjusts the amount of fuel supplied to the engine, a throttle opening sensor is installed on the throttle valve located in the engine intake path, and a steering angle sensor is installed on the steering wheel. and an increase rate of the throttle valve opening detected by the throttle opening sensor,
Since the fuel cut-in supply amount to the engine during turning acceleration is determined from the magnitude of the turning angle of the steering wheel detected by the turning angle sensor, the following effects are brought about. That is, according to claim 1,
The rate of increase in the throttle opening is calculated by the increase rate calculating means based on the signal from the throttle opening sensor of the engine, and the turning state of the vehicle is detected based on the signal from the turning state detecting means, and the turning state is detected. The correction amount calculation means receives the output from the means and the output from the throttle opening increase rate calculation means, and calculates the increase correction amount of fuel to be supplied to the engine. The fuel supply amount is calculated from the basic fuel supply amount calculated based on the output of the driving state detection means for detecting the state and the output of the correction amount calculation means, and the fuel supply amount is calculated based on the output of the fuel supply amount calculation means. A predetermined amount of fuel can be supplied to the engine from the supply means.

According to the second aspect of the present invention, the rate of increase in the throttle valve opening is detected by the throttle opening signal obtained from the throttle opening sensor, and at the same time, the rate of increase in the throttle valve opening is detected by the steering angle signal obtained from the steering angle sensor. The magnitude of the steering angle applied to the steering wheel is detected, and the interrupt injection amount during turning acceleration of the vehicle can be immediately determined from the increase rate of the throttle valve and the magnitude of the steering angle.

That is, the engine's output characteristics are required to have higher response characteristics when the vehicle is turning than when the vehicle is traveling straight ahead, and the present invention addresses this requirement by providing higher response characteristics than when the vehicle is accelerating straight ahead. Since it is possible to control the interrupt injection amount of fuel to be larger when the vehicle is in a turning acceleration state, the acceleration performance during turning of the vehicle is enhanced, and the great effect of improving the drive feeling can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the basic concept of the fuel supply control device for an internal combustion engine according to the present invention, FIG. 2 is a schematic diagram showing a specific example of the present invention, and FIG. 3 is a schematic diagram for explaining the same control system. It is a graph showing characteristics. l...Controller, 3...Fuel injection valve, l3...
・Water temperature signal, 13a...Water temperature sensor, I5...Crank angle signal, 15a...Distributor, 17
...Intake air amount signal, 20...Engine, 21...0, Sensor output signal,
22... Intake path, 24... Exhaust path, 30... Fuel injection amount control signal, 35... Throttle distance signal, 35
a... Throttle opening sensor, 36... Steering angle signal, 36a... Steering angle signal, 40
... Operating state detection means, 4l... Turning state detection means, 42... Throttle opening sensor, 43... Fuel supply amount calculation means, 44... Correction amount calculation means, 45...
(throttle) increase rate calculation means, 46... fuel supply means,

Claims (2)

[Claims] (1) Turning state detection means for detecting the turning state of the vehicle;
an increase rate calculation means for calculating an increase rate of the throttle opening based on a signal from a throttle opening sensor of the engine; and an increase in fuel supplied to the engine based on the output from the turning state detection means and the output from the increase rate calculation means. A correction amount calculating means for calculating a correction amount, an operating state detecting means for detecting the operating state of the engine, a basic supply amount of fuel calculated based on the output of the operating state detecting means, and an output of the correction amount calculating means. a fuel supply amount calculation means for calculating the fuel supply amount from;
A fuel supply control device for an internal combustion engine, comprising a fuel supply means for supplying fuel to the engine based on the output of the fuel supply amount calculation means. (2) In a fuel supply control device that adjusts the amount of fuel supplied to the engine according to the running condition of the vehicle, a throttle opening sensor is installed on the throttle valve located in the intake path of the engine, and a A steering angle sensor is installed on the wheel, and the turning angle relative to the engine is determined based on the increase rate of the throttle valve opening detected by the throttle opening sensor and the magnitude of the steering wheel steering angle detected by the steering angle sensor. 1. A fuel supply control device for an internal combustion engine, characterized in that a fuel cut-in supply amount during acceleration is determined.