JPH0288981A - Control instrument of battery - Google Patents

Abstract

PURPOSE:To prevent a battery from expiration of life by sending a warning when the charging state of the battery comes up to an allowable discharge capacity based on a battery temperature characteristic from an integrated value of an electric power-meter connected with a battery circuit. CONSTITUTION:By connecting an electric power-meter 6 with the battery circuit, a current value of charging-discharging of a battery 5 is measured, and when a discharging capacity detected by the integration of this current value comes up to an allowable limit discharging capacity obtained from the battery temperature characteristic, warning lamps 81, 82 are lit up to warn for immediate charge. By this method, even in case a discharging time from the battery 5 is long, an expiration of the battery 5 is not occurred by accident, and the charging state of the battery is always, properly controlled.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a battery management device that manages the amount of electricity stored in a large current discharge battery that supplies power to an electric mechanism connected to the rotating shaft of a turbocharger. Regarding.

(Prior Art) In recent years, adiabatic engines have been developed that employ fire-resistant heat insulating materials such as ceramics mainly in the combustion chamber of the engine.

This type of adiabatic engine does not require cooling of the cylinder head, cylinder head, etc., so the exhaust gas temperature after combustion is high and the exhaust gas energy is large, so this exhaust gas energy drives the turbocharger equipped with a compressor. The turbocharger pumps supercharged air to the engine to improve engine output, and a rotating electric machine that serves as an electric generator is attached to the rotating shaft of the turbocharger, and is driven as either an electric motor or a generator depending on the engine operating status. JP-A-59-141711 and JP-A-60-195 propose ways to increase engine output and recover exhaust energy.
It is disclosed in publications such as No. 329.

When the electric motor of the rotating electric machine is driven, power is supplied from an on-vehicle battery to drive the motor, thereby assisting the supercharging operation of the compressor.

(Problem to be Solved by the Invention) When the electric motor of the rotating electric machine proposed above is driven, the battery is discharged. If the load condition continues for a long time and the discharging time becomes long, there is a possibility that the amount of stored electricity in the battery will be depleted and so-called battery drain will occur.

In addition, in order to prevent the battery from draining, it is necessary to constantly monitor the battery voltage, which has the disadvantage of making voltage monitoring troublesome. The terminal voltage fluctuates due to changes in temperature, making it difficult to accurately grasp the state of charge in the battery.

The present invention was made in view of such problems,
The purpose is to provide a battery management device that easily and accurately grasps the amount of electricity stored in a battery for a rotating electric machine of a turbocharger and prevents the battery from running out of power.

(Means for Solving the Problems) According to the present invention, a discharge amount detection means is connected to a battery circuit to measure the current charging and discharging the battery, and integrates the current value to detect the discharge amount of the battery. A battery management device is provided, which has a warning means that issues w8 when the discharge amount detected by the discharge amount detection means reaches the allowable limit discharge amount at which the battery is dead based on battery temperature characteristics.

(Function) In the present invention, the charging/discharging current of the battery can be measured by a power meter connected to the battery circuit, and the state of charge of the battery can be detected based on the integrated value. When the amount is reached, a warning is issued and the battery is charged.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In the figure, 1 is the engine. This engine is an insulated engine that uses fine ceramics for the cylinder, cylinder head, inside of the intake and exhaust path, piston rings, piston head, valves, etc., and does not require a radiator to cool the engine. That is.

The vehicle is driven by the combustion energy of the air taken in through the intake pipe 11 and the supplied fuel, and the exhaust gas after combustion is discharged through the exhaust pipe 12.

2 is the turbocharger and intake pipe! ! and exhaust pipe 12
When the turbine 2 is rotationally driven by the exhaust gas energy discharged from the exhaust pipe 12, the air is driven through the intake pipe 11 by the compressor 22 disposed coaxially with the turbine 2. The supercharged air is then pumped to the engine 1.

3 is a rotating electric machine attached to the rotating shaft of the turbine 21 and the compressor 22, and when driving power is supplied, it operates as an electric motor to energize the compressor 22 and assist the supercharging operation of the turbocharger 2. For example, in order to improve the engine output when an engine with little exhaust energy is running at low speed and under high load, power is transmitted to the rotating electric machine 3 to increase the supercharging pressure.

Reference numeral 4 denotes a power converter, which converts the DC power from the battery 5 into AC power of a predetermined frequency and transmits the power to the rotating electrical machine 3 to drive the rotating electrical machine 3. For example, it is used to power heavy electrical equipment such as an inverter or a voltage booster. When the energization switch 41 is closed, the power converter 4 is activated and a predetermined power is applied to the rotating electric machine 3.

Reference numeral 6 denotes a power measuring instrument, which is equipped with a non-contact type measuring section 61 using a Hall element, and can measure the current value, current direction, voltage, etc. of the circuit passing through the measuring section 61, and has a built-in microcomputer. There is.

Therefore, in addition to calculating the integrated value of the measured current and the integrated value of electric power, etc., the IlI diagram of the rotating electrical machine, which will be described later,
Data related to battery temperature and terminal voltage, etc. are stored as a data map, and the stored data map is searched based on various inputs to obtain desired data.

7 is a normal electrical load such as a lighting lamp installed in a vehicle,
Electric power is supplied from the battery 5, and 51 is a liquid temperature meter that detects the liquid temperature of the battery 5. Its output is connected to a power meter 6, and a signal based on the battery liquid temperature is sent to the power meter. Output to 6.

81 and 82 are warning lights, which indicate the amount of electricity stored in the battery 5 (
This is a warning that the charging rate (charging rate) has decreased and charging is required.If both warning lights 81 and 82 are on, if charging is urgently required, the warning light 81 is on and the warning light 82 is on. When it is off, it indicates that rapid charging is required, and the lighting command for these warning lights is issued from the power meter 6.

Figure 2 is a curve diagram showing the relationship between the battery temperature, the terminal voltage under no load, and the state of charge of the battery, and shows that the terminal voltage changes depending on the state of charge and temperature of the battery. To know the charging status, measure the terminal voltage and temperature,
The state of charge is determined by searching based on these values.

FIG. 3 is an explanatory diagram showing an example of integrating the current value measured by the power meter 6 according to time. As shown in the figure, when the amount of discharge increases more than the amount of charge and reaches a value at which the battery becomes dead (point A), a warning light is displayed, and from this point on, the rotating electric machine 3 is operated as a motor and the power converter is activated. The battery 5 is charged via the battery 4. In addition, A in Figure 3
When setting the level of the point, after measuring the terminal voltage and battery temperature when the battery 5 is open before starting the engine and setting the initial state from the battery characteristics shown in the curve diagram shown in Fig. 2, the allowable discharge of the battery is determined. The level of point A is calculated based on the amount.

FIGS. 4 and 5 are control diagrams of the rotating electric machine in such a case and processing flow diagrams showing an example of related operations, and the processing will be explained next.

First, in steps 1 to 3, as an initial setting, the terminal voltage and temperature of the battery under no load are measured, and the charging rate of the battery is read from the data map.

In Step 4, start the engine, operate the turbocharger and rotating electric machine, and in Steps 5 and 6, read the battery voltage, battery current, engine speed, boost pressure, etc., and integrate the battery current to determine the current charging rate. In addition, the target boost pressure is read out in step 7.

In step 8, the calculated charging rate is checked and if it is less than 60, both warning lights 81 and 82 are turned on to warn you.
The operation of the electric motor of the rotating electric machine 3 is stopped and the battery 5 is urgently charged as the generator is operated (steps 9 to 1).
0).

If the charging rate is 60 or higher in step 8, step 11
If it is 75 or less, in step 12, the warning light 81 is turned on and 82 is turned off, and only one side lights up to display a warning about the charging status, but if it is 75 or more, step 1
Proceeding to step 8, both warning lights 81 and 82 are turned off, indicating that the charging state is good. Then, the process proceeds from the caution state of step 12 to step 13, and when it is determined to accelerate the turbocharger, the process proceeds to step 14, but the inverter is turned off and power supply from the battery is stopped. In addition, if the acceleration is not determined in step t3, the process proceeds to step 16, and according to the mode judgment of the rotating electric machine 3, if the rotating electric machine 3 is electric, the process proceeds to step 14 to turn off the inverter. If not, the process proceeds to step 14, where discharging from the battery is stopped.

From step 18, when the charging state of the battery is reasonably good, the process advances to step 19, where the charging rate is compared with 80, and when it is less than 80, the process proceeds to step 20, and when accelerating the turbocharger, power conversion is performed at step 21. Electric power is supplied to the rotating electrical machine 3 through the device 4 to operate the motor and increase the boost pressure. Note that if there is no need to accelerate in step 20, the process proceeds to step 22, and according to the mode determination of the rotating electrical machine 3, when the rotating electrical machine 3 is electric, power is supplied from the battery 5 to the rotating electrical machine 3 to drive the rotating electrical machine 3 electrically.

Also, when charging, it emits! Rapid charging will be performed by the output of the rotary electric machine 3 in mechanical operation (step 24.23).

If the charging rate is 80 or higher in step 19, step 2
The process advances to step 5, and if it is determined that acceleration is occurring, the process proceeds to step 21, where the acceleration operation begins.

If acceleration is not required in step 25, the mode of the rotating electric machine 3 is set in step 26, and in the case of charging, the process proceeds to step 27, where the charging rate is compared with 120, and the charging rate is compared with 120.
If it is less than 0, normal charging is performed in step 28.

Also, if it is 120 or more in step 27, step 2
The voltage is checked in step 9, and if it is less than 14.5V, normal charging occurs in step 28, but if it is more than 14.5V, overcharging occurs, so the regulator is turned off and charging is not performed (step 28). 15).

Although the present invention has been described above with reference to the above embodiments, various modifications can be made within the scope of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, a power meter is connected to a battery circuit to measure the current value for charging and discharging the battery, and the amount of discharge detected by integrating this current value is determined from the battery temperature characteristics. When the allowable discharge limit is reached, a warning is issued and charging starts immediately, so even if the battery has been discharged for a long time, the battery will not be charged up accidentally, and the charging state of the battery will always be correct. It has the effect of being managed.

[Brief Description of the Drawings] Figure 1 is a block diagram showing the configuration of an embodiment of the present invention, Figure 2 is a temperature characteristic curve diagram of a battery, and Figure 3 is an example of an integral value of charging/discharging current of a battery. FIG. 4 is a control diagram of the rotating electric machine, and FIG. 5 is a processing flow diagram showing an example of the operation related to this embodiment. 1...Engine, 2...Turbocharger, 3...
・Rotating electric machine, 5... battery, 6... power measuring device,
51...Liquid thermometer, 61...Measurement section. Figure 2

Claims (1)

[Claims] A discharge amount detection means connects to the battery circuit to measure the current charged and discharged by the battery, and integrates the current value to detect the discharge amount of the battery, and the discharge amount detected by the discharge amount detection means is based on the battery temperature characteristics. 1. A battery management device comprising: warning means for issuing a warning when a permissible limit discharge amount is reached, indicating that the battery is dead.