JPS6275112A - Discharge quantity and flow change quantity detector of hydraulic valve - Google Patents

Abstract

PURPOSE:To detect the discharge quantity and flow change quantity of a hydraulic valve without using a special sensor by calculating with an arithmetic unit based on the switching direction value to the hydraulic valve and the actual shift distance of a hydraulic actuator. CONSTITUTION:A hydraulic valve 3 is operated by the switching direction value R1 from an operation lever 1, and a hydraulic actuator 4 is driven. The shift distance L of this hydraulic actuator 4 is measured to determined the shift speed L' and acceleration L''. On the other hand, the theoretical shift distance, speed, acceleration of the hydraulic actuator 4 are calculated by the first arithmetic unit 51 based on the switching direction value R1 and various sizes of the hydraulic valve 3 and hydraulic actuator 4. Next, differences between these measured values and theoretical values are obtained by the second arithmetic unit 52. The theoretical values are coreected by the third arithmetic unit 53 based on the differences, and the discharge quantity and flow change quantity of the hydraulic valve 3 are determined by the fourth arithmetic unit 54 based on these correction values.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for detecting the discharge amount and flow rate variation of a hydraulic valve that supplies pressure oil from a hydraulic source to a hydraulic actuator.

Conventional technology In order to control the operation of a hydraulic actuator that operates based on the discharge amount of a hydraulic valve with high responsiveness and high precision, the hydraulic valve is controlled by quickly and accurately switching the hydraulic valve based on the switching command value input to the hydraulic valve. It is necessary to adjust the pressure oil supplied to the hydraulic actuator, that is, the discharge amount and the amount of change in flow rate, to predetermined values based on the switching command value.

For this purpose, it is necessary to detect and feed back the discharge amount and flow rate change amount of the hydraulic valve.

Problems to be Solved by the Invention However, current flow rate sensors are expensive and have poor detection accuracy, and the reality is that there is no flow rate sensor that satisfies the above-mentioned requirements.

Furthermore, there is no senna that detects the amount of change in flow rate.

For this reason, the reality is that it is not possible to control the operation of hydraulic actuators with high responsiveness and high precision.

Means and actions for solving the problem A switching command value for a hydraulic valve that is switched based on a switching command value and supplies pressure oil from a hydraulic source to a hydraulic actuator, and a hydraulic pressure that operates using pressure oil from the hydraulic valve. Equipped with a calculation section that calculates the discharge amount and flow rate change amount based on the actuator's operating distance, the theoretical operating distance of the hydraulic actuator calculated from various dimensions of the hydraulic valve and the hydraulic actuator, and K, without using a special sensor. It is designed so that the discharge amount and flow rate change amount of the hydraulic valve can be detected.

Embodiment The output of the potentiometer 2 provided with the operating lever IK, that is, the switching command value, is supplied to the hydraulic valve 3, and the hydraulic valve 3 is switched based on the switching command value, and pressure oil from a hydraulic source (not shown) is transferred to the hydraulic actuator. 4, and
The switching command value is sent to the calculation section 5.

The operating distance of the hydraulic actuator 4 is detected by a detector 6 and sent to a differentiating circuit 7 and an arithmetic unit 5.
The value differentiated once by the differentiator 7, that is, the velocity, and the value differentiated twice by the differentiator 7, that is, the acceleration, are sent to the calculation section 5.

The arithmetic unit 5 includes a hydraulic valve 3 and a hydraulic actuator 4.
A first calculation section 51 that calculates the distance, speed, and acceleration at which the hydraulic actuator 4 theoretically operates according to the switching command value inputted to the hydraulic valve 3 based on various dimensions of , and the calculation results of the first calculation section 51. a second calculation unit 52 that calculates the difference between the actual distance, velocity, and acceleration;
a third calculation unit 53 that corrects the calculation results of the first calculation unit 51 based on the calculation results of step 2 to calculate the true distance, velocity, and acceleration;
and a fourth calculation unit 54 that calculates the discharge amount and flow rate change amount of the hydraulic valve 3 based on the calculation results of the third calculation unit 53. The discharge amount and flow rate change amount of the hydraulic valve 3 can be detected based on the actual moving distance.

FIG. 2 is an explanatory diagram showing an example of the calculation section 5, and the differentiation circuit 7 includes first and second differentiators 7. , 72, so that the value differentiated by the first differentiator 7□ is sent to the second differentiator 7□ and differentiated again.

The measured moving distance L, the calculated speed, and the acceleration °L are sent to the first adder 10 via the first, second, and third gain generators A, B, and C, and the switching command value is sent to the fourth gain. The moving distance L is sent to the first adder 11 via the generator
1 speed L1 acceleration is the 5th, 6th, and 7th gain generator B
, F.

G to the second adder 11, and the first adder IO
The output value of is sent to the second adder II via the integrator 12,
It is fed back to the first adder 10 via the eighth gain generator H, and the calculation result of the second adder 11 becomes the discharge amount and flow rate change amount of the operating valve 3.

In other words, by changing the value of each gain generator, the discharge amount,
This is the amount of change in flow rate.

Effects of the Invention It is possible to detect the discharge amount of a hydraulic valve and the amount of change in flow rate without using an expensive and inaccurate flow rate sensor or flow rate change amount sensor.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall explanatory diagram, and FIG. 2 is an explanatory diagram of a calculation section. 3 is a hydraulic valve, 4 is a hydraulic actuator, and 5 is a calculation unit.

Claims (1)

[Claims] Theory of the hydraulic actuator 4 calculated based on the switching command value of the hydraulic valve 3, the operating distance of the hydraulic actuator 4 that operates with pressure oil from the hydraulic valve 3, and various dimensions of the hydraulic valve 3 and the hydraulic actuator 4. 1. A hydraulic valve discharge amount and flow rate change detection device, comprising a calculation unit 5 that calculates the discharge amount and flow rate change amount based on the operating distance.