JPS6224697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circulating grain drying device that dries grain such as unhulled rice while maintaining it in a high quality state.
Specifically, the present invention relates to a fuel consumption calculation device for calculating the fuel consumption required for such a circulating grain drying apparatus.

In a circulating grain drying apparatus, a burner is usually used as a drying means. In many cases, drying equipment using such burners is equipped with a control device that includes a moisture content detection sensor that controls the grain to be dried to a certain moisture content while maintaining a high quality state.

However, when drying a large amount of grain or when drying grain continuously, a large amount of fuel is supplied to the burner. In addition to the amount of grain to be dried, fuel consumption also depends on external conditions such as humidity and temperature. It worsens the efficiency and increases waste.

Therefore, in the past, a scale was attached to the fuel tank so that the remaining amount could be visually checked, and the operator checked the remaining fuel amount before driving and after driving, and calculated the fuel consumption per unit time from the difference. This was done to obtain the fuel consumption data necessary to determine optimal operating conditions.

However, such conventional methods have difficulty in calculating accurate fuel consumption, cannot provide sufficient reliable data when determining the most efficient driving style, and are difficult to calculate themselves. Since the operator has to do it himself/herself, it is complicated and has the disadvantage of impairing operability.

The present invention has been made in view of the above, and provides a fuel consumption calculation device that can accurately and automatically calculate fuel consumption, thereby contributing to improved operating efficiency and energy saving of a drying device. The purpose is to

In summary, this invention focuses on the relationship that when fuel passing through a fuel supply pipe is controlled to be supplied in a pulsed manner, the frequency or duty ratio of the pulse is correlated with the amount of fuel consumption. In addition to providing an electromagnetic pump to be driven, an equation of the correspondence between the pulse frequency or duty ratio and fuel consumption is stored in advance in a memory, and the frequency or duty ratio of the pulse signal currently driving the electromagnetic pump is determined by the above correspondence equation. The fuel consumption amount is calculated by substituting

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram schematically showing the relationship among a burner, a fuel tank, and an electromagnetic pump.

In the same figure, a fuel supply pipe 3 connected between a fuel tank 1 and a burner 2 branches into two routes midway, and an electromagnetic pump 4 is connected to each pipe before branching, and a main electromagnetic valve is connected to each pipe after branching. 5 and an ignition solenoid valve 6 are interposed. The ignition solenoid valve 6 opens during ignition and closes during combustion. Further, the main solenoid valve 5 closes during ignition and opens during combustion. The electromagnetic pump 4 is controlled by a plunger, and the plunger is turned on and off by a pulse signal from a pulse generator (not shown). Note that 7 is asbestos and 8 is an ignition heater.

Next, a block diagram of a fuel consumption calculation device according to the present invention is shown in FIG. This device is designed to detect the drive pulse and calculate the fuel consumption when the electromagnetic pump is pulse-driven independently by another drive control circuit.

In the figure, the electromagnetic pump 4 is connected to a driver 10 that supplies a drive current, and this driver 10 includes a pulse generator 12 that generates a pulse signal of a frequency corresponding to a supply control signal from a drive control circuit 11. Connecting. Note that the pulse generator 12 outputs a pulse signal whose variable element is only the frequency, and the pulse width is fixed.

The pulse signal output from the pulse generator 12 is further sent to a counter 13, which counts the number of pulses per unit time. The counted number of pulses is sent to the microcomputer 14, and the microcomputer 14 calculates the amount of fuel consumption.

The microcomputer 14 stores a CPU 140 that executes calculations and control, a ROM 141 that stores execution procedures in the CPU 140, work registers necessary during calculations, and a relational expression between pulse number and fuel consumption that is unique to this invention. The RAM 142 includes a memory area for sequentially accumulating the calculated fuel consumption, and an I/O interface 143 for receiving data from the counter 13, which is an input means. Although the counter 13 is used to count the number of pulses per unit time, if a real-time clock is connected to the microcomputer 14,
You don't have to use counter 13. In that case, the microcomputer 14 counts the number of pulses per unit time.

Figure 3 shows the operation details of this device, that is, ROM1
41 is a flowchart showing an execution means for calculating the fuel consumption amount stored in 41.

First, in step n ₁ (hereinafter step n _x will be simply referred to as n _x ), the microcomputer 14 takes in from the counter 13 the number of pulses counted per unit time. Next, in _n2 , the amount of fuel consumption per unit time is calculated from the number of pulses taken in.
Here, if the pulse width is constant, it is clear that the amount of fuel consumed per unit time l is proportional to the number of pulses Pi per unit time, that is, the frequency, so the pulse width of the signal from the pulse generator 12 Since is fixed, the formula for calculating fuel consumption is: l = KPi (K is a constant determined in advance from known fixed values such as pipe diameter, pulse width, fuel flow rate, etc.) ( 1) becomes.

That is, the RAM 142 stores the above equation (1) as a fuel consumption correspondence relational expression, and _n2 calculates the fuel consumption per unit time based on this equation.

Next, at _n3 , the fuel consumption amount calculated at _n2 is added to the accumulated amount stored up to that point. The cumulative amount is
It is stored in the integration memory area of the RAM 142, and addition is performed by taking out the data in this integration memory area and adding the fuel consumption data calculated in _n2 to that data. continued n ₄
Now, the addition data obtained in n ₃ is transferred to the RAM 142 again.
Store in the integrated memory area. Then, at _n5 , the stored data in the integrated memory area is displayed.

In the manner described above, fuel consumption is automatically measured and displayed. Furthermore, at the stage of n ₃ ,
If the fuel consumption amount per unit time is stored in a separate storage area prior to integration, this fuel consumption amount can also be displayed. Moreover, when the pulse width of the output signal of the pulse generator 12 is changed,
Or if the diameter of the pipe changes, etc., the RAM
The constant K in the above equation (1) stored in 142 may be changed.

Next, a block diagram of another apparatus to which the present invention is applied is shown in FIG. 4, and an execution procedure for calculating fuel consumption, which is the operation content of the apparatus, is shown in FIG.

This device differs from the above devices in that it also controls the drive of the electromagnetic pump, and the content of the control state is determined by a contact switch (not shown) connected to a microcomputer. There is.

The difference in configuration from the above device is that a timer LSi is installed on the bus line of the microcomputer 14.
144 is connected, and the driver 10 is directly connected to the output port of the I/O interface 143, with no intervening pulse generator, counter, etc.

The timer LSi 144 operates for a certain period of time (for example,
This is an element that issues an interrupt signal to the CPU 140 every 10 seconds) and requests the CPU 140 to execute data capture from a grain moisture content sensor, a hot air temperature sensor, etc. (not shown), which are objects to be dried. be. When the data from these sensors is taken in, the CPU 140 determines the optimal frequency for pulse-driving the electromagnetic pump 4 from the same data, and
A drive pulse is applied to the driver 10 via the O interface 143. In this way, the microcomputer 14 can control the electromagnetic pump 4 without using a counter, a pulse generator, etc.
This is because the frequency of the drive pulse is known to the microcomputer itself since it is designed to directly drive the microcomputer. Note that, from the above-mentioned operation details, the RAM 142 naturally needs to store in advance a correspondence table between the data from the sensor group and the drive pulse frequency.

The execution procedure for calculating fuel consumption shown in FIG. 5 is basically the same as the procedure shown in FIG.
The difference is in the operation contents of n ₁₀ and n ₁ . That is,
In n ₁₀ , the frequency of the drive pulse is controlled by the microcomputer itself, so
In contrast, in n ₁ , the counter 1 is read as described above.
3 through the I/O interface 143. The other steps are exactly the same, n ₁₁ becomes n ₂ , n ₁₂ becomes n ₃ , n ₁₃ becomes
n ₄ and n ₁₄ correspond to n ₅ , respectively.

In the above embodiment, the pulse width of the drive pulse was kept constant and the fuel consumption was calculated from the number of pulses per unit time, that is, the frequency.However, the frequency is fixed and the flow rate is controlled by the duty ratio. When a drive pulse is used,
The fuel consumption correspondence relational expression stored in the RAM 142 may be replaced with l=K'D (D: duty ratio) (2).

3 and 5 correspond to the fuel consumption calculation means of the present invention in each embodiment.

As explained above, according to the present invention, the fuel consumption of the burner is automatically calculated, which reduces the burden on the operator, and the calculated data is extremely accurate, allowing optimal operation of the drying equipment. This has the advantage that the state can be easily set.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the relationship between a burner, a fuel tank, and an electromagnetic pump, FIG. 2 is a block diagram of a calculation device according to the present invention, and FIG. 3 is a flowchart showing the operating procedure of the device. FIG. 4 is a block diagram of another example of the calculation device according to the present invention, and FIG.
The figure is a flowchart showing the operating procedure of the device. 1... fuel tank, 2... burner, 3... fuel supply pipe, 4... electromagnetic pump, 14... microcomputer.

Claims (1)

[Claims] 1. An electromagnetic pump that is installed in the middle of a fuel supply pipe and is configured to supply fuel by pulse drive, and a correspondence relational expression between the frequency or duty ratio of the pulse signal that drives this electromagnetic pump and the fuel consumption amount are prepared in advance. A circulation system characterized by comprising a memory for storing, and a fuel consumption calculation means for calculating a fuel consumption amount by substituting the frequency or duty ratio of a pulse signal currently driving the electromagnetic pump into the correspondence equation. Fuel consumption calculation device for type grain drying equipment.