Electronic control method for throttle and electronically controlled throttle device

Abstract

To control rotation speed without excessive overshoot for a rotation speed command and to converge the rotation speed to the rotation speed command, in a case of rotation speed control by an electronic control method.SOLUTION: In an electronic control method for a throttle which performs opening / closing control of the throttle while electronic control means generates a control signal based on an inputted data signal, the electronic control means calculates engine speed deviation from a difference between an engine speed and an engine speed command, calculates an engine rotation acceleration based on the engine speed, obtains proportional torque from the product of the engine speed deviation and a proportional torque coefficient, obtains integrated torque by multiplying the integration of the products of the engine RPM deviation and the integration torque coefficient by a forgetting factor, and generates a control signal for the throttle with the sum of the proportional torque and the integrated torque as a torque command value.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a control method for opening and closing a throttle installed in an intake system of an engine by an electronic control system, and to an electronically controlled throttle device for carrying out said control method. [Background technology]

[0002] Conventionally, in order to perform highly accurate engine control for the purpose of improving the fuel efficiency and driving performance of a vehicle, an electronically controlled throttle device has been described, for example in JP-A-5-240073 (Patent Document 1), in which a throttle installed in the engine intake system is opened and closed mechanically by the driver's accelerator operation, but the throttle is opened and closed by operating an electronic control unit, which is an electronic control means.

[0003] In addition, in such an electronically controlled throttle device, a control method is presented in JP 2008-038872 A (Patent Document 2) in which the difference between the detected engine speed and the engine speed command (target speed) is calculated to determine the speed deviation, and a throttle actuator is driven to realize a throttle operation that is preset as an appropriate value depending on the amount of this deviation.The present applicant has also proposed in JP 2022-148583 A (Patent Document 3) a control method in which the difference between the detected engine speed and the engine speed command (target speed) is calculated to determine the speed deviation, and a throttle actuator is driven to realize a throttle operation that is preset as an appropriate value depending on the amount of this deviation.

[0004] A known torque calculation section in conventional throttle control is as shown in Fig. 4. To explain the configuration, the engine speed deviation is calculated as a value obtained by subtracting the engine speed calculated from a preset engine speed command and the pulse period input from the crank pulse sensor, the product of this engine speed deviation and a proportional torque coefficient is calculated as the proportional torque required of the engine, and the product of the engine speed deviation and an integral torque coefficient is integrated to calculate an integral torque. The sum of the calculated proportional torque and integral torque is then used as the torque command required of the engine.

[0005] In such a conventional control method, the integral torque is calculated by the following formula: i ) is integrated, and when a load is applied and the rotation speed deviation is positive (when the engine speed is smaller than the engine speed command), the integral torque is integrated according to the engine speed deviation and continues to increase in the positive direction.

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[0006] If this type of control system is used to keep the engine speed constant when a load is applied and removed as shown in Fig. 5, when a load is applied and the engine speed deviation is positive (when the engine speed is smaller than the engine speed command), the integral torque will increase to the torque required to make the engine speed match the engine speed command.

[0007] Thereafter, when the load is removed, it takes time for the integral torque to return to the steady state at no load, which causes the engine speed to overshoot excessively relative to the engine speed command, or takes time to converge to the speed command. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 5-240073 [Patent Document 2] JP 2008-038872 A [Patent Document 3] JP 2022-148583 A Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to control the rotation speed without excessive overshooting of a rotation speed command when controlling the rotation speed, and to quickly converge to the rotation speed command. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides an electronic throttle control method in which an electronic control means generates a control signal based on an input data signal to control the opening and closing of a throttle, comprising the steps of: The electronic control means calculates an engine rotation speed deviation from a difference between an engine rotation speed and an engine rotation speed command, calculates an engine rotation acceleration based on the engine rotation speed, calculates a proportional torque from a product of the engine rotation speed deviation and a proportional torque coefficient, calculates an integral torque by multiplying a product of the engine rotation speed deviation and an integral torque coefficient by a forgetting factor, and generates a control signal for the throttle using the sum of the proportional torque and the integral torque as a torque command value.

[0011] The present invention also provides an electronically controlled throttle device comprising a throttle with an actuator and electronic control means, the electronic control means generating a control signal based on an input data signal and controlling the opening and closing of the throttle via the actuator, The electronic control means comprises: a rotational speed deviation calculation means for calculating an engine rotational speed deviation from a difference between an engine rotational speed and an engine rotational speed command; a rotational angular acceleration calculation means for calculating an engine rotational angular acceleration based on the engine rotational speed; a proportional torque calculation means for calculating a proportional torque from a product of the engine rotational speed deviation and a proportional torque coefficient; and an integral torque calculation means for calculating an integral torque by integrating the product of the engine rotational speed deviation and an integral torque coefficient and multiplying the result by a forgetting factor.

[0012] In the present invention, when the engine rotation speed is greater than the engine rotation command speed and the engine rotation acceleration is equal to or greater than a set acceleration, the forgetting factor is a value greater than 0 and less than 1, and otherwise the forgetting factor is 1. Effect of the Invention

[0013] According to the present invention, the increase in engine speed during load removal is detected from the engine speed and engine rotation acceleration, and the integral torque is calculated by multiplying the engine speed by a forgetting factor, thereby enabling control without excessive overshoot and enabling the engine to quickly converge to the rotation speed command. [Brief description of the drawings]

[0014] [Figure 1] 1 is a simplified configuration diagram of an electronically controlled throttle device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a functional block diagram showing the control contents by the electronically controlled throttle device according to the embodiment shown in FIG. 1. [Diagram 3] 2 is a graph showing a change in integral torque when a load is applied and released when the engine speed is controlled to coincide with an engine speed command in an example of control using the electronically controlled throttle device of FIG. 1; [Figure 4] FIG. 1 is a functional block diagram showing the control contents of a conventional electronically controlled throttle device. [Diagram 5]6 is a graph showing a change in integral torque when a load is applied and released when the engine speed is controlled to coincide with an engine speed command in a control example using a conventional electronically controlled throttle device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] Figure 1 is a simplified diagram of an electronically controlled throttle device according to an embodiment of the present invention. As shown in this figure, the electronically controlled throttle device 1 comprises a throttle 20 equipped with an actuator (not shown), and an electronic control unit (ECU) 10 which is an electronic control means for controlling the opening and closing of the throttle 20. The electronic control unit 10 automatically controls the opening and closing of the throttle 20 by generating control signals using a prescribed calculation method based on various data signals input thereto.

[0017] The electronic control unit 10 also includes means functionally constituted by software stored in a storage means (not shown), such as rotation speed calculation means 11 for calculating the engine rotation speed, rotation speed deviation calculation means 12 for calculating the engine rotation speed deviation, rotation acceleration calculation means 13 for calculating the engine rotation acceleration, proportional torque calculation means 14 for determining the proportional torque, and integral torque calculation means 15 for determining the integral torque.

[0018] Next, the control executed by the electronic control unit 10 will be described in detail with reference to the functional block diagram of FIG. 2 and the graph of FIG.

[0019] First, in this embodiment, the rotation speed calculation means 11 calculates the engine rotation speed from the period of a pulse signal input from a crank pulse sensor (not shown), the rotation speed deviation calculation means 12 calculates the engine rotation speed deviation from the difference between the engine rotation speed and a commanded engine rotation speed command (target rotation speed), and the rotation acceleration calculation means 13 calculates the engine rotation acceleration based on the engine rotation speed.

[0020] The proportional torque calculation means 14 and the integral torque calculation means 15 calculate the proportional torque and the integral torque, and the sum of the proportional torque and the integral torque is used as a torque command value to generate a control signal for the throttle 20. In the calculation of the integral torque shown in the following formula (1), an integral torque coefficient (integral torque gain K i ), a forgetting factor is used, which is a feature of the present invention.

[0021]

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[0022] Forgetting factor K FG is determined by the following conditions A and B. Condition A: When the engine rotation speed is higher than the engine rotation speed command and the engine rotation acceleration is equal to or higher than the set acceleration, the forgetting factor K FG = A value greater than 0 and less than 1. Condition B: Otherwise, the forgetting factor K FG =1.

[0023] As described above, when the engine rotation speed is higher than the engine rotation speed command and the engine rotation acceleration is equal to or higher than the set acceleration, i.e., when the engine is accelerating, the forgetting factor is set to a value greater than 0 and less than 1.

[0024] As a result, when the engine speed is controlled to match the engine speed command, the increase in engine speed due to load removal is detected and the forgetting factor K FG is set to a value greater than 0 and smaller than 1, the time required for the integral torque to return from a value under load to a value under no load is shortened, the amount of overshoot of the engine speed with respect to the engine speed command is reduced, and the convergence time of the engine speed to the engine speed command is also shortened.

[0025] As described above, according to the present invention, by detecting the increase in engine speed during load removal from the engine speed and engine rotation acceleration and multiplying it by a forgetting factor to obtain integral torque, it is possible to control without excessive overshoot and to quickly converge to the engine speed command. [Explanation of symbols]

[0026] 1 Electronically controlled throttle device, 10 Electronic control unit (ECU), 11 Rotational speed calculation means, 12 Rotational speed deviation calculation means, 13 Rotational acceleration calculation means, 14 Proportional torque calculation means, 15 Integral torque calculation means, 20 Throttle

Claims

1. A method for electronically controlling a throttle, in which an electronic control means generates a control signal based on an input data signal to control the opening and closing of the throttle, comprising the steps of: The electronic control means Calculating an engine rotation speed deviation from the difference between the engine rotation speed and the engine rotation speed command; Calculating an engine rotation acceleration based on the engine rotation speed; A proportional torque is calculated from the product of the engine speed deviation and a proportional torque coefficient. calculating an integral torque by integrating the product of the engine speed deviation and an integral torque coefficient and multiplying the result by a forgetting factor; a sum of the proportional torque and the integral torque is used as a torque command value to generate a control signal for the throttle; A method for electronically controlling a throttle.

2. The forgetting factor is When the engine rotation speed is higher than the engine rotation command speed and the engine rotation acceleration is equal to or higher than a set acceleration, a forgetting factor is set to a value greater than 0 and smaller than 1; Otherwise, forgetting factor = 1.

2. The method for electronically controlling a throttle according to claim 1.

3. An electronically controlled throttle device comprising a throttle with an actuator and electronic control means, the electronic control means generating a control signal based on an input data signal and controlling the opening and closing of the throttle via the actuator, The electronic control means a rotation speed deviation calculation means for calculating an engine rotation speed deviation from a difference between the engine rotation speed and an engine rotation speed command; a rotation angular acceleration calculation means for calculating an engine rotation angular acceleration based on the engine rotation speed; a proportional torque calculation means for calculating a proportional torque from the product of the engine rotation speed deviation and a proportional torque coefficient; and an integral torque calculation means for integrating the product of the engine rotation speed deviation and an integral torque coefficient and multiplying the result by a forgetting factor to obtain an integral torque. An electronically controlled throttle device.

4. The forgetting factor is When the engine rotation speed is higher than the engine rotation command speed and the engine rotation acceleration is equal to or higher than a set acceleration, a forgetting factor is set to a value greater than 0 and smaller than 1; Otherwise, forgetting factor = 1.

4. The electronically controlled throttle device according to claim 3.

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