JPS62101853A - Engine output control structure - Google Patents

Abstract

PURPOSE:To produce quickly and smoothly a torque corresponding to both the displacement of an accelerator pedal and a change in the accelerator pedal displacement by detecting the engine torque of an output delivery shaft of an engine at all times as a parameter for an engine output control. CONSTITUTION:The displacement of an accelerator pedal detected by a sensor 1 and signals from sensors of various types provided to an engine 3 are inputted into an electromagnetic control unit 2 through a signal line 4. And based on the output signal from the unit 2, a fuel injection device 8 which controls the engine 3, and the switching of an air conditioner 9 are controller. In this case, a torque detector 6 is provided to an output shaft 5 of the engine 3 for inputting the detected signal into the unit 2 through a signal line 7. And when an engine torque is varied, the engine 3 is controlled with the fuel injection device 8 actuated such that a change in the engine torque dtheta/dt corresponds with a set value which is expressed in a function of the accelerator pedal displacement theta and a change in the accelerator pedal displacement dtheta/dt.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an engine output control structure, and more particularly to an engine output control structure Alv5 that controls the shaft torque of an output transmission shaft of an engine.

<Prior Art> In general, engine output is controlled by controlling various variable elements such as fuel supply amount using parameters such as engine rotation speed and intake air position.

In such an engine, the control pattern of various variable elements for various parameters is uniquely set at the engine development and construction stage, and in any case, the engine output can be adjusted according to the driver's intention. It is difficult to say that this will occur.

For example, when the driver increases the accelerator opening in the hope of accelerating the vehicle, if the load on the engine is large, the vehicle may not accelerate as the driver intended. Further, even when the vehicle is traveling at a constant speed at an arbitrary medium speed, the vehicle speed may not be constant due to external factors such as road conditions.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main purpose of the present invention is to constantly detect the shaft torque of the output transmission shaft of the engine and incorporate it as a parameter for engine control. The object of the present invention is to provide an engine output control structure that generates an accelerator displacement amount and a torque corresponding to a change in the accelerator displacement amount as quickly and smoothly as possible.

<Means for Solving the Problems> According to the present invention, such an object includes an accelerator operating device, an accelerator displacement detecting means for detecting an accelerator displacement amount of the accelerator operating device, and an accelerator displacement detecting means for detecting an accelerator displacement amount of the accelerator operating device. In the engine output control structure, the engine output control structure includes at least one control means for variably controlling the output of the engine, and a shaft torque detection means for detecting the shaft torque of the output transmission shaft of the engine; An enmoji deno J characterized in that it has means for comparing a time differential function of the displacement amount and a change in the shaft torque, and the control means is operated based on the output of the comparison means. This is achieved by providing control structure.

<Operation> Therefore, according to the engine output control structure based on the present invention, it is possible to suitably generate the displacement amount of the accelerator and the shaft torque of the output transmission shaft of the engine according to the change in the displacement amount of the accelerator, and also to suppress various disturbances. This makes it possible to stably control the engine.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an engine output control structure based on the present invention. An accelerator displacement amount θ is inputted to an electronic control unit 2 by an accelerator displacement amount detector 1 provided at a portion interlocked with the accelerator pedal. Signals from various detectors attached to the engine 3 are input to the electronic control unit 2 through a signal line 4. A fuel injection device 8 that controls the engine 3 is driven by an output signal from the electronic control unit 2. Further, the on/off control of the air conditioner 9 driven by the engine 3 is also performed by signals from the electronic control unit 2.

The output l1iII15 of the engine 3 is equipped with a torque detector 6 of a known type, such as an optical type or a magnetic type, which detects the shaft torque transmitted to the axle (not shown). It's like getting.

This axis 1 to lux value is panned to the electronic control unit 2 by a signal line 7.

The electronic control unit 2 normally outputs a signal corresponding to the accelerator displacement amount θ to drive the fuel injection device 8 based on signals from various detectors input through the signal line 4. The engine 3 is controlled by doing this.

Furthermore, the electronic control unit 1~2 calculates the change in accelerator displacement dθ/dt and the change in shaft torque dT/dt per unit time based on the input accelerator displacement θ, axis]~silk.
has been calculated, and if there is a change in axis 1 to torque,
The engine 3 is controlled by driving the fuel injection device 8 so that the change in shaft torque dT/dt matches a set value expressed as a function of the accelerator displacement amount θ and the change in accelerator displacement amount dθ/dt. is under control.

FIG. 2 shows a flow chart of the program flow in the engine control structure according to the present invention.

First, in STI, the accelerator displacement amount θ from the accelerator displacement amount detector 1 is input, and in ST2, the change in accelerator displacement amount dO/dt is calculated. In ST3, input the torque T from the shaft 1 torque detector 6, and in ST4, input the torque T from the shaft 1 torque detector 6.
~Calculate the change in torque dT/dt.

Next, in ST5, the change in shaft torque dT/dt is compared with a set value expressed by a function f(θ, dθ/d1) whose variables are the change in accelerator displacement θ and the change in accelerator displacement dθ/dt. do. The change in shaft torque dT/dt is the function f(θ, d
If the value is smaller than θ/dt ), in ST6,
Further, it is determined whether the change in shaft 1-lux dT/dt is less than or equal to a limit value. If the change in shaft torque dT/dt is not below the limit value, it is determined that this is not due to an abnormal load, and in ST7, the fuel is adjusted in a direction to optimize the change in shaft torque dT/dt. The fuel is increased by the injection device 8 and the process returns to ST1. Alternatively, in ST6, if the change in shaft torque dT/dt is less than the limit value, it is determined that this is due to an abnormal load, and in ST8, the air conditioner 9, which is the load factor, is canceled, Return to ST'l.

In addition, in ST5, if the change in shaft torque dT/(it is a value larger than the function f(θ, dθ/dt), S
At T9, to reduce the change in shaft torque (cut fuel and return to ST1).

In addition, in ST5, the change in shaft torque dT/dt is expressed as a function f
(θ, dθ/dt), the process returns to ST1 and repeats from ST1 again.

In this embodiment, the engine output in ST7 and ST9 is increased or decreased by increasing or decreasing the fuel in the fuel injection device. Any device that can increase or decrease the output may be used, and it is particularly preferable to control a combination of multiple engine output variable control mechanisms.

Furthermore, in the case of an abnormal load in ST8, it is sufficient to not only cancel the air conditioner, but also temporarily stop the cooling fan motor, etc., as long as it does not interfere with engine control. It is also good to release the load in multiple combinations.

In addition, the control in ST7 is not limited to the above, but the function f
(θ, dO/dt) Create a rising curve of shaft torque from the rising curve of shaft torque, and if the rise of the actual shaft torque is small compared to the rising curve of shaft torque, it is possible to match the rising curve of shaft torque. It is also conceivable to create a modified torque increase curve that approximates the torque increase curve as closely as possible.

In this case, by performing so-called feedforward control in which the amount of fuel is increased in accordance with the corrected torque increase curve, it is possible to suppress an excessive increase in shaft torque due to a sudden increase in fuel amount.

By performing feedforward control in this way,
It is possible to prevent the inconvenience of placing an excessive load on the drive system, which occurs when a so-called skid start occurs due to sudden start or acceleration. Therefore, since there is no need to extremely increase the rigidity of the drive system, it is possible to reduce the weight of the drive system, reduce component costs, and improve the response of the drive system.

In this embodiment, the shaft torque detector was installed on the output shaft of the engine, but the detector may be installed at any location where the engine output is transmitted, for example, on the transmission. It may be an output shaft. In this case, the value of the shaft torque T can be adjusted by multiplying the value of the shaft torque T as a coefficient by the reduction ratio corresponding to the gear position.

<Effects of the Invention> As described above, according to the present invention, since the change in the shaft torque of the output transmission shaft of the engine is compared with the change in the accelerator displacement and the accelerator displacement base, the change in the shaft torque is controlled. Acceleration/deceleration control can be performed, and engine output can be controlled with extremely good followability in response to the driver's accelerator operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an engine output control structure based on the present invention. FIG. 2 is a flowchart showing the flow of a program in the engine output control structure according to the present invention. 1...Accelerator displacement base detector

Claims (3)

[Claims] (1) An engine output control device comprising an accelerator operating device, an accelerator displacement detecting means for detecting an accelerator displacement amount of the accelerator operating device, and at least one control means for variably controlling the engine output with respect to the accelerator displacement amount. In the control structure, a shaft torque detection means for detecting the shaft torque of the output transmission shaft of the engine, and means for comparing the accelerator displacement amount and a function of the time derivative of the accelerator displacement amount with the change in the shaft torque. An engine output control structure, characterized in that the control means operates based on the output of the comparison means. (2) The engine output control structure according to claim 1, wherein the change in the shaft torque follows the function by the operation of the control means. (3) The operation of the control means prevents the change in the shaft torque from exceeding an upper limit value.
The engine output control structure according to item 1 or 2.