JP2688679B2 - Automotive hydraulic clutch controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle hydraulic clutch control device capable of clutch engagement that more faithfully reflects the driver's intention. [Prior Art] A conventional hydraulic clutch control device for an automobile adjusts pressure oil discharged from a hydraulic pump to a predetermined hydraulic pressure by a regulator, and uses a solenoid valve and a flow control valve as a predetermined low control pressure by a pressure regulating valve. Is being supplied to. The solenoid valve is turned on and off by a pulse width modulation (hereinafter referred to as PWM) signal from the control device to adjust the amount of oil supplied from the regulator to the flow control valve. The amount of oil supplied is controlled to engage or disengage the clutch. In addition, the control device inputs the input torque of the clutch, the rotation speed and control pressure of the input side and the output side of the clutch,
The PWM is performed, and the regulator and the solenoid valve are controlled by the PWM signal to control the amount of oil supplied to the flow control valve, thereby controlling the amount of oil supplied to the clutch. Further, the control device inputs the output signal detected by the throttle opening detection means as the input fuel to the engine as the prime mover. Further, the control device processes the difference between the predetermined engine target rotation speed and the engine rotation speed according to the input amount to the engine by a predetermined control law, and the low pass of the standard clutch pressure according to the input amount to the engine. The difference between the filtered values (feedforward amount) is used as the target clutch pressure. This low-pass filter is necessary for smooth movement of the clutch during the initial engagement of the clutch and improvement of the feeling of sudden fuel change to the engine during engagement. [Problems to be Solved by the Invention] However, in the determination of the feedforward amount of the conventional hydraulic clutch control device for an automobile, the standard clutch pressure changes depending on the throttle opening, but the rise, that is, the cutoff frequency of the low-pass filter is the same. Because
The difference in feeling is not clear, so it is unsatisfactory when you want to take a quick start. The present invention has been made to solve such a problem, and an object of the present invention is to obtain a hydraulic clutch control device for an automobile capable of clutch engagement faithfully reflected by the driver's intention. [Means for Solving Problems] A hydraulic clutch control device for a vehicle according to the present invention includes a clutch for connecting / disconnecting transmission of power between a prime mover and a load, and a pressure for controlling output pressure of a hydraulic pump. Includes a flow control valve that controls the flow rate of the control valve output hydraulic pressure to the clutch, and a low-pass filter that passes the reduction component of the standard clutch pressure from the throttle opening. The difference between the value calculated by a predetermined control algorithm and the standard clutch pressure that has passed through the low-pass filter is used as the clutch pressure target value, and the operation amount is calculated from the difference between the clutch pressure and the clutch pressure. In a device that controls a valve, the cutoff frequency of a low-pass filter is varied as a function of at least one of the throttle opening and the amount of change in the throttle opening. And a control means for controlling. [Operation] In the present invention, the control device determines the control value from the difference between the target engine speed according to the throttle opening and the input side speed of the clutch, and determines the target clutch pressure according to the throttle opening. The reduction component is passed through the low-pass filter, the deviation between the output of the low-pass filter and the control value is calculated to obtain the target hydraulic pressure, and the manipulated variable is calculated.This is pulse-width modulated and the input side rotational speed and output side rotational speed of the clutch are calculated. The pressure control valve and the flow rate control valve are controlled so that the numbers are equal to each other, and the cutoff frequency of the low-pass filter is set to a predetermined value as a function of the throttle opening, the throttle opening change amount, or at least one of them. [Embodiment] An embodiment of a hydraulic clutch control device for an automobile according to the present invention will be described below with reference to the drawings. FIG. 1 is a system block diagram showing the configuration of the embodiment. In FIG. 1, reference numeral 1 denotes a prime mover. Reference numeral 2 is a hydraulic pump driven by the prime mover 1. The hydraulic pressure of the hydraulic pump 2 is controlled to a predetermined pressure by the pressure control valve 3 and becomes the line pressure P _L and is supplied to the flow rate control valve 4. From the flow rate control valve 4, a control pressure P _C (= actuating pressure generation of the clutch 5, that is, clutch pressure) is supplied to the clutch 5. The clutch 5 is interposed in the power transmission path between the prime mover 1 and the load 6, transmits the power of the prime mover 1 to the load 6 when engaged, and prevents the motion of the prime mover 1 from transmitting to the load 6 when disconnected. is there. The control pressure P _C is detected by the pressure sensor 7. The detection output of the pressure sensor 7 is transmitted to
To be sent. Further, the rotation speed of the prime mover 1, that is, the input rotation speed N _I of the clutch 5 is detected by the rotation speed sensor 9, and similarly, the output rotation speed N _O of the clutch 5 is detected by the rotation speed sensor 10. I'm trying to detect. The detection outputs of these rotation speed sensors 9 and 10 are sent to the control device 8. Further, the temperature of the cooling water of the prime mover 1 is detected by the temperature sensor 11, and the detection output is also sent to the control device 8. The prime mover 1 is provided with the prime mover 1
The temperature of the cooling water of the prime mover 1 is detected by the temperature sensor 11, and the detection output thereof is also sent to the control device 8. The fuel supplied to the prime mover 1 is detected by detecting the throttle opening by the throttle opening detecting means 12. The detection output of the throttle opening degree detection device 12 is sent to the control device 8. The controller 8 inputs each of these inputs to the input processing unit 8a, and at the same time, inputs the engagement / disconnection command signal for the clutch 5. The control device 8 calculates a predetermined operation amount by each input control part 8b input to this input processing part 8a, PWMs it and outputs it from the PWM output part 8c, and outputs the pressure control valve 3 and the flow rate. The control valve 4 is controlled to perform feedback control so that the input side rotation speed N _I of the clutch 5 becomes the target rotation speed N _D. The control portion 8b of the control device 8 is constructed as shown in FIG. 2, which shows that when the clutch 5 is in the disengaged state,
It is a control block diagram when the connection command of the clutch 5 is input to the input processing unit 8a. In FIG. 2, the throttle opening .theta. Detected by the throttle opening detecting means 12 is input to the target rotational speed generating means 81 and the standard clutch pressure generating means 82. The standard clutch pressure generating means 82 outputs a predetermined standard clutch pressure P _S according to the throttle opening θ and sends it to the subtraction circuit 84 via the low pass filter 83. On the other hand, the target rotation speed generation means 81 outputs the target rotation speed N _D of the prime mover 1 according to the throttle opening θ to the subtraction circuit 85. The subtraction circuit 85 also receives the clutch input-side rotation speed N _I from the rotation speed sensor 9. As a result, the subtraction circuit 85 calculates the deviation ε1 between the target rotation speed N _D and the input side rotation speed N _I and sends it to the speed control means 86. The speed control means 86 sends a control value calculated by multiplying the proportional gain K _S to the subtraction circuit 84 according to a predetermined control law. In the subtraction circuit 84, the output of the low-pass filter 83 and the output of the speed control means 86 are subtracted, the target hydraulic pressure P _D is calculated and sent to the subtraction circuit 87. Target speed generating means 81, standard clutch pressure generating means 82,
Low pass filter 83, subtraction circuits 84 and 85, speed control means 86
Is a calculation means in the control device 8, and inputs the throttle opening θ and the input side rotation speed N _I of the clutch 5,
A target value P _D (target hydraulic pressure) of the control pressure Pc for the clutch 5 is calculated as a predetermined operation amount. Further, the standard clutch pressure generating means 82 and the low-pass filter 83 constitute a feedforward amount determining means for calculating an operation amount based on a target value (throttle opening θ), and a speed control means 86 and a pressure control means 88. Constitutes a feedback means for calculating the manipulated variable based on the feedback amount or the deviations ε ₁ and ε ₂ . The control pressure from the pressure sensor 7 shown in FIG.
P _C is adapted to be inputted, the subtraction circuit 87 is the output of the subtracting circuit 84, i.e., by performing a subtraction between the target hydraulic pressure P _D and the control pressure P _C, sends the deviation ε2 to the pressure control means 88 It is supposed to do. The pressure control means 88 inputs this deviation ε2 and performs, for example, proportional, integral, and derivative (PID) processing to calculate a manipulated variable, PWMs this manipulated variable, and outputs the PWM output 89 as the PWM output of FIG. Output from the portion 8c to the pressure control valve 3 and the flow rate control valve 4. The cutoff frequency f _C of the low-pass filter 83 is set to be higher as the throttle opening is larger, or the throttle opening change amount is larger, or as a function of either or both of the throttle opening and the change amount. Good. Next, the operation will be described. Predetermined fuel is supplied from the supply fuel control means 13 to the prime mover 1, and the prime mover 1 is operated to drive the hydraulic pump 2. By driving the hydraulic pump 2, the hydraulic pressure is discharged to the pressure control valve 3. The pressure of this pressure oil is controlled to a predetermined pressure by the pressure control valve 3, and the pressure oil of the run-in pressure P _L is supplied to the flow rate control valve 4. As a result, the flow rate control valve 4 controls the control pressure P _C to control the flow rate of the pressure oil to the clutch 5, and detects the coupling state of the prime mover 1 and the load 6, that is, the state of the clutch 5. At this time, the control pressure P _C is detected by the pressure sensor 7, and the detected control pressure P _C is sent to the subtraction circuit 87 of the control unit 86 via the input processing unit 8a of the control device 8. At this time, the rotation speed of the input side and the output side of the clutch 5
N _I and N _O are detected by the rotation speed sensors 9 and 10, respectively, and sent to the input processing unit 8a. Of these, the input side rotation speed N _I is sent to the subtraction circuit 85. On the other hand, the fuel input from the fuel supply control means 13 to the prime mover 1 is detected by detecting the throttle opening degree by the throttle opening degree detecting means 12. The throttle opening θ detected by the throttle opening detection means 12 is input to the standard clutch pressure generation portion 82 and the target rotation speed generation means 81 shown in FIG. 2 via the input processing portion 8a. FIG. 2 shows a control block of the control device 8 when the clutch 5 is disengaged and a connection command is given. Now, by inputting the throttle opening θ as described above, The target rotation speed generation means 81 generates a target rotation speed N _D of the prime mover 1 according to the throttle opening θ and sends it to the subtraction circuit 85. As a result, the subtraction circuit 85 calculates the deviation ε1 between the target speed N _D and the input side speed N _1, and sends it to the speed control means 86. This speed control means 86 has a proportional gain K _S to this deviation ε1.
A predetermined control value is calculated by multiplying the calculated value by a factor such as multiplication and output to the subtraction circuit 84. On the other hand, at the same time, the target clutch pressure generation means 82, to which the throttle opening θ is input, outputs a predetermined standard clutch pressure P _S according to this throttle opening θ, and the standard clutch pressure P _S is low-passed. The signal is sent to the filter 83, where the reduction component is passed and sent to the subtraction circuit 84. The subtraction circuit 84 is the output of the low-pass filter 83 and the control means 86.
The target hydraulic pressure P _D is calculated by performing a subtraction with the output of the target hydraulic pressure P _D , and the target hydraulic pressure P _D is sent to the subtraction circuit 87. The subtraction circuit 87 subtracts the target hydraulic pressure P _D from the control pressure P _C from the pressure sensor 7 to calculate the deviation value ε2. This deviation value ε2 is sent to the pressure control means 88. The pressure control means 88 inputs this deviation value ε2 to perform PID control, calculates a predetermined operation amount, and PWMs this operation amount to P
The WM output 89 is output from the PWM output section 8c of FIG. 1 and is output to the pressure control valve 3 and the flow rate control valve 4, and as a result, the control pressure P _C is controlled so as to become a predetermined pressure. To the target clutch pressure P _D and the input speed
N _I should also be the target speed N _D. In this way, the clutch pressure is feedback-controlled so as to become the target clutch pressure P _D, and the input rotation speed N ₁ of the clutch 5 is also feedback-controlled so as to become the target rotation speed N _D. In this case, when the standard clutch pressure P _S is the target rotation speed N _D , the output torque T _D of the prime mover 1 and the gain of the clutch 5 K _C = clutch transmission torque / clutch pressure, and the relation of P _S = T _D / K _C If the clutch pressure is P _C ≈ P _D ≈ P _S , then N _I ≈ N _D
State. If the output torque T _D of the prime mover 1> the load torque T _L , the output side rotational speed N _{O of the} clutch 5 gradually increases, and eventually
N _I = N _O and clutch connection control ends. By the way, the low-pass filter 83 is necessary at the initial stage of connection of the clutch 5 in order to improve the feeling of smooth movement of the clutch and a sudden change in the throttle angle θ during connection, but in the present invention, the low-pass filter 83 is cut off. The frequency f _C is set higher as the throttle opening is larger and the throttle opening change amount is larger. Alternatively, it may be a function of either or both of the throttle opening and the throttle opening change amount. By doing so, when the feedforward amount (standard clutch pressure P _S ) changes depending on the throttle opening, the cutoff frequency of the low-pass filter 83 changes, and the difference in feeling becomes clear, making the driver's intention more faithful. The clutch connection will be reflected. [Advantages of the Invention] As described above, the present invention provides a pressure control valve that controls the output pressure of a hydraulic pump driven by a prime mover to a line pressure, and a power transmission path provided between a prime mover and a load. The hydraulic clutch that connects / disconnects the transmission and the run-in pressure from the pressure control valve are controlled to be the control pressure that is the clutch pressure for operating the clutch, and the flow rate of the pressure oil to the clutch by this control pressure. It has a flow control valve for controlling and a calculation means for calculating a predetermined operation amount by inputting the throttle opening degree by the fuel supplied to the prime mover and the clutch input side rotation speed, and the pulse width according to the operation amount The control means controls the pressure control valve and the flow rate control valve so that the control pressure for the clutch and the input side rotation speed reach the target values by performing the modulation, and the calculation means is the throttle A means for generating a target rotation speed of the prime mover based on the opening degree, a means for generating a standard value of the control pressure based on the throttle opening degree, a low-pass filter for passing a low-frequency component of the standard value, a reduction component and a target. And a means for generating a target value of the control pressure as an operation amount based on the deviation between the rotation speed and the input side rotation speed, in the control of the pressure control valve and the flow control valve, the low-pass filter of the operation amount calculation process. Since the cutoff frequency is changed to a predetermined value that is a function of at least one of the throttle opening and the throttle opening change amount, there is an effect that the clutch engagement that more faithfully reflects the driver's intention can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system block diagram of a vehicle hydraulic clutch control device according to an embodiment of the present invention, and FIG. 2 is a control block diagram of the control device in the same embodiment. 1 ... motor, 2 ... hydraulic pump, 3 ... pressure control valve,
4 ... Flow control valve, 5 ... Clutch, 6 ... Load, 7 ...
... pressure sensor, 8 ... control device, 9, 10 ... rotation speed sensor, 11 ... temperature sensor, 12 ... throttle opening detection means, 13 ... supply fuel control means, 81 ... target rotation speed generation means , 82 …… Standard clutch generating means, 83 …… Low pass filter. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] A pressure control valve (3) for controlling the output pressure of a hydraulic pump (2) driven by a prime mover (1) to obtain a line pressure (P _L ), and a power transmission path between the prime mover and a load (6). A hydraulic clutch (5) for connecting / disconnecting power transmission, and a control pressure (P _C ) which is the clutch pressure for operating the clutch by controlling the run-in pressure from the pressure control valve. The flow rate control valve (4) for controlling the flow rate of the pressure oil to the clutch by this control pressure, the throttle opening (θ) by the fuel supplied to the prime mover, and the input side rotational speed (N _I ) of the clutch. By having a calculating means for inputting and calculating a predetermined operation amount, and performing pulse width modulation according to the operation amount, the control pressure for the clutch and the input side rotational speed are respectively set to target values. Pressure control valve and flow rate control And control means for controlling (8), and said arithmetic means includes means for generating a target rotational speed of the prime mover (N _D) based on the throttle opening, the control pressure based on the throttle opening Means for generating the standard value (P _S ) of the low-pass filter, a low-pass filter (83) for passing the low-frequency component of the standard value, and the reduction component and the deviation between the target speed and the input-side speed. And a means for generating a target value (P _D ) of the control pressure as the manipulated variable, in the control of the pressure control valve and the flow control valve, the cutoff frequency of the low-pass filter in the process of calculating the manipulated variable, A hydraulic clutch control device for an automobile, characterized by changing to a predetermined value that is a function of at least one of a throttle opening and a throttle opening change amount.