JPH0245629A - Air conditioner controller for vehicle - Google Patents

Abstract

PURPOSE:To prevent the exhaustion of a battery by controlling the faculty of an air conditioner on the basis of the result of the detection by an electric charge/discharge detecting means when the drive of an air conditioner is detected. CONSTITUTION:When the vehicle stop state is detected on the basis of the detection signal of a car speed sensor 3, and it is detected on the basis of the detection signal of a neutral switch 2 that a selecting lever is in the D range, and the drive of an air conditioner is detected on the basis of the ON/OFF of an air conditioner switch 4, an ECU 1 starts the time counting by a timer 1a. When the counted time reaches a prescribed time, it is indirectly judged that the electric discharge current of a battery increases over the charge electric current, and the capacity of the blower 5 of an air conditioner is lowered from the high to the middle state, and when a prescribed time lapses, the faculty of the blower 5 is lowered from the middle to the low state. Therefore, the electric load of the air conditioner can be reduced according to the electric charge/discharge incomings and outgoings and the exhaustion of the battery can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a car air conditioner control device that is linked to an engine, and more specifically, to prevent a battery from being discharged due to the electric load of an air conditioner in a vehicle equipped with an automatic transmission. The present invention relates to a car air conditioner control device.

[Question to be solved by the prior art and the invention B1 Conventionally, in a vehicle equipped with an automatic transmission equipped with an air conditioner, when the air conditioner is used, the vehicle is stopped with the select lever set to the D range (a range other than the neutral range). If it continues for a long time or if you start and stop frequently, such as when driving in a city, the idle speed of the engine during stopping is low, so the amount of power generated by the alternator decreases, and the electric discharge to supply the electrical load of the air conditioner decreases. There was a problem that the amount of charge became larger than the amount of charge, and the battery became drained.

This invention was made to solve the above problems, and its purpose is to reduce the electrical load of the air conditioner in accordance with the charge/discharge balance of the battery in a vehicle equipped with an automatic transmission equipped with an air conditioner. The object of the present invention is to provide a car air conditioner control device that can prevent air conditioners from rising.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a vehicle equipped with an automatic transmission equipped with an air conditioner. When the drive of the air conditioner is detected by the charge/discharge balance detection means for detecting the charge/discharge balance of the installed battery and the air conditioner drive detection means, the capacity of the air conditioner is determined based on the detection result by the charge/discharge balance detection means. The gist thereof is a car air conditioner control device equipped with an air conditioner control means for controlling the air conditioner.

Here, the charging/discharging balance detecting means includes stop detecting means for detecting a stopped state of the vehicle, operating range detecting means for detecting that the operation position of a select lever constituting the automatic transmission is in an operating range, and the above-mentioned When the stop detection means detects that the vehicle has stopped, and the operation range detection means detects that the select lever is operated in the operation range, the air conditioner control means performs a timing operation and after a predetermined period of time has elapsed. It is preferable to include a clock means for outputting a signal.

Further, the charging/discharging balance detecting means may be a charging/discharging current detecting resistor that directly detects the charging/discharging current of the battery.

[Operation] Therefore, the charge/discharge balance detection means detects the charge/discharge balance of the battery mounted on the vehicle, and the air conditioner control means detects charge/discharge when the air conditioner drive detection means detects that the air conditioner is in operation. The capacity of the air conditioner is controlled based on the detection result of the means.

The charging/discharging balance detecting means includes a stop detecting means for detecting a stopped state of the vehicle, an operating range detecting means for detecting that the operating position of the select lever constituting the automatic transmission is in the operating range, and the stop detecting means for detecting the operating range of the select lever constituting the automatic transmission. When the stop of the vehicle is detected by the means and the operating range detecting means detects that the select lever is operated to the operating range, a timing operation is performed and a signal is sent to the air conditioner control means after a predetermined period of time has elapsed. By including a clock means for outputting , it is indirectly detected that the discharging current of the battery is larger than the charging current, and based on this, the performance of the air conditioner is controlled by the air conditioner control means.

In addition, by using a charging/discharging current detection resistor that directly detects the charging/discharging current of the battery as the charging/discharging balance detection means, the amount of discharge of the battery can be accurately detected, and based on this, the air conditioner control means can adjust the capacity of the air conditioner. is controlled.

[First Embodiment] A first embodiment embodying the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is an electrical block diagram showing a car air conditioner control device.
(referred to as U) has a built-in timer 1a as a timekeeping means, and on its input side a neutral switch 2 as an operating range detection means, a vehicle speed sensor 3 as a stoppage detection means for detecting the stopped state of the vehicle, An air conditioner switch 4 serving as air conditioner drive detection means is connected. Further, a blower 5 for blowing air to the evaporator of the air conditioner is connected to the output side of the ECUt.

The neutral switch 2 detects that the select lever (shown in the diagram) constituting the automatic transmission is operated to the neutral range, which is a non-operating range, or to an operating range other than the parking range (hereinafter referred to as D range). , in this embodiment, the neutral switch 2
, the vehicle speed sensor 3, and the timer 1a constitute a charge/discharge balance detection means for detecting the charge/discharge balance of the battery.

The ECU1 determines whether the vehicle speed is "0" based on the detection signal of the vehicle speed sensor 3.
”, that is, whether the vehicle is stopped or running, and also determines whether the select lever is operated to the D range based on the detection signal of the neutral switch 2. do. Further, the ECU1 determines whether to drive or stop the air conditioner based on whether the air conditioner switch 4 is turned on or off.

Then, when it is detected that the vehicle is stopped, the select lever is operated to the D range, and the air conditioner is detected to be running, the ECU 1 starts the timer 1a to measure the time. When the clock time reaches a predetermined time Tl (30 seconds in this embodiment), it is indirectly determined that the battery discharge current is larger than the charging current, and the capacity of the air conditioner blower 5 is determined as shown in Fig. 3 (C
), the time is lowered from high to middle, and the time measured by timer 1a is reduced to a predetermined time T2.
(20 seconds in this embodiment), the blower 5
The ability of the player is lowered from middle to low as shown in Figure 3 (C1).

In addition, if the ECU 1 does not detect that the vehicle is stopped, that the select lever is operated in the D range, or that the air conditioner is running, the ECU 1 starts the timer 1a's timing operation. At the same time, the capacity of the air conditioner blower 5 is returned to its original high state as shown in FIG. 3(C).

Next, the processing executed by the ECU 1 will be explained based on the flowchart shown in FIG.

Now, ECUl follows the program for 1 second routine 10
0, first, in step 101, the vehicle speed sensor 3 is activated.
The vehicle speed is acquired based on the detection signal of the following step 102.
It is determined whether the vehicle speed is "0", that is, whether the vehicle is stopped, and if it is determined that the vehicle is stopped, step 103
Proceed to and determine whether the select lever operating position is in the D range.

If it is determined in step 103 that the operating position of the select lever is in the D range, the process proceeds to step 104, in which it is determined whether the air conditioner is operating, that is, whether the electrical load is large or not, and whether the air conditioner is operating. If it is determined that this is the case, the process proceeds to step 105.

In the subsequent step 105, the timer 1a is operated to measure time, and "l" is added to the measured time T, and the process proceeds to step 106.

In step 106, it is determined whether or not the measured time T is 50 seconds or more, and if it is determined that it is less than 50 seconds, step 107
Then, it is determined whether the measured time T is 30 seconds or more. If the determination is affirmative, the rotation of the blower 5 is lowered from high to middle in the next step 108, and this routine ends.

If it is determined in step 106 that the time T is 50 seconds or more, the process proceeds to step 109, where the rotation of the blower 5 is reduced from middle to low, and this routine ends.

Further, in step 102, it is determined that the vehicle speed is not rOJ, that is, the vehicle is in a running state.
If it is determined in Step 3 that the operating position of the select lever is not in the D range, that is, in the neutral range, for example, or if it is determined in Step 104 that the air conditioner is stopped, the process moves to Step 110 and the timer 1a starts the timing operation. , and the measured time T is reset to "0", and in the subsequent step 111, the rotation of the blower 5 is returned to its original state, and this routine is completed.

If it is determined in step 107 that the time T is less than 30 seconds, this routine is ended.

Now, when the air conditioner is in use with the blower 5 operating in the high state as shown in Figure 3 (C1), the vehicle is running in the same state as when the select lever is operated in the D range as shown in Figure 3(a). When the vehicle stops at point A as shown in Figure (b), the maximum generated current of the alternator decreases as the engine speed NE decreases to the idle speed N due to the vehicle stop, as shown in Figure 4. And the generated current I
Since the difference between o and the air conditioner electrical load current 11 at that time indicated by ■ increases, the amount of discharge from the battery increases.

However, as shown in FIG. 3 tc+, after a predetermined time ETt (=30 seconds) from the point A, the capacity of the air conditioner blower 5 is reduced from high to medium, and the air conditioner electrical load current is reduced to the fourth level. From 11 shown with ■ in the diagram to I shown with ■
2, the air conditioner electrical load current I2 and the generated current 1. The difference between This makes it possible to reduce the discharge current from the battery and prevent the battery from dying.

Further, in the vehicle stopped state, a predetermined time T2
(=20 seconds), the capacity of the blower 5 changes as shown in Figure 3 (
As shown in C), the electric load current of the air conditioner is reduced from middle to low, and the electric load current of the air conditioner is reduced from I2 shown by ■ in Fig. 4 to I3 not shown by ■, and the electric load current I3 of the air conditioner is reduced to Current 1. Since the battery is smaller than the current, it is possible to charge the battery by passing a charging current through it.

Furthermore, when the vehicle shifts to the running state as shown at point B in Figure 3(b) due to the driver's accelerator operation, the capacity of the blower 5 changes from low to high as shown in Figure 3 (C1). ), and the cooling capacity can be improved. This is because when the vehicle shifts to driving mode, the engine speed NE increases, the maximum generated current of the alternator increases, and there is no danger of the battery dying. It is something.

Also, as shown in Figure 3(b), between point C and point D,
Even if the vehicle is stopped with the range selected, the stopping time T3 is less than 30 seconds, so the performance of the blower 5 is high.
(high). Since the stop time T3 is short, there is little risk of the battery running out, so the cooling capacity can be prioritized. Also, Figure 3 (
As shown in a), from point 9 onwards when the select lever is operated in the neutral range, the capacity of the blower 5 is held at high as shown in the same figure (cl). This is because the idling speed can be increased by increasing the amount of fuel, that is, by slightly deteriorating fuel efficiency, and thereby the power generation capacity of the alternator can be improved.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 8.

FIG. 5 is an electrical block diagram showing a car air conditioner control device, in which a battery 11 mounted on the vehicle is connected to a headlight mounted on the vehicle via a charging/discharging current detection resistor 12.
Various electric loads 13 such as a defogger are connected, and an alternator 14 driven by the engine is connected between the charge/discharge current detection resistor 12 and the electric load 13.

Then, the battery 11 is
The discharge current (current in the left direction in FIG. 5) from the alternator 14 and the generated current by the alternator 14 (current in the right direction in FIG. 5) are detected, and the detection signals are manually input to the ECU1. Further, an idle switch 15 for detecting the idle operating state of the engine is connected to the ECUI, and a neutral switch 2 similar to the first embodiment is connected to the ECUI.
is connected.

In addition, a relay 16 is connected to the output side of the ECU 1 to turn on and off the magnetic clutch of the air conditioner compressor 17 based on a signal from the IEcUI.
The blower 5 is connected by two signal lines, and the blower 5 is connected to E.
Based on the output signal from the CU 1, the rotation is controlled in four stages: high, middle, low, and stop.

The ECU t determines whether the engine is in an idling state based on a detection signal from the idle switch 15, that is, whether the vehicle is in a stopped state, and also determines whether the select lever is set to D based on a detection signal from the neutral switch 2. It is designed to determine whether or not the microwave is being operated.

Further, when the stopped state of the vehicle is detected, the ECUI calculates the charging/discharging current IB of the battery 11 detected by the charging/discharging current detection resistor 12 as shown in FIG. The discharge amount of the battery 11 per unit time is detected by integrating (5 seconds in this embodiment), and the rotational speed of the blower 5 is switched and controlled based on the detection result.

Furthermore, when the ECU 1 determines that the select lever is operated in a non-operating range other than the D range (for example, neutral range) while the vehicle is stopped, it performs idle up control to increase the idle speed. There is.

Next, the processing executed by the ECU 1 will be explained based on the flowchart shown in FIG.

First, in step 121, it is determined whether the vehicle is in a stopped state. If it is determined that the vehicle is stopped, the process proceeds to step 122, and the charging/discharging state is detected based on the above equation (1). In step 123, the discharge amount detected in step 122≧
Determine whether it is J1 or not, and if the determination is positive, step 1
Proceed to step 24.

In step 124, it is determined whether the operating position of the select lever is in the D range, and if the determination is positive, step 12
Proceeding to step 5, switching control of the blower 5 and on/off control of the magnetic clutch are performed.

That is, as shown in FIG. 8, when J2>discharge amount≧J1, the capacity of the blower 5 drops from high to medium, and when discharge amount≧J2, the capacity of the blower 5 decreases. Drop from high to low.

Further, when the period during which the discharge amount≧J2 exceeds a predetermined time, the blower 5 is turned off, the magnetic clutch of the compressor 17 is turned off, and this routine is ended.

If it is determined in step 124 that the operating position of the select lever is in the non-operating range (for example, neutral range), the process moves to step 126, where idle up control is performed, and this routine ends.

Further, if it is determined in the step 121 that the vehicle is in a running state, or if it is determined in the step 123 that the discharge amount is Jl>, the process moves to step 127 and the capacity of the blower 5 is returned to the original high state. This routine ends.

As described above, in this second embodiment, when the vehicle is stopped and the engine speed is at the idle speed, the charging/discharging current of the battery 7 battery 11 is directly measured by the charging/discharging current detection resistor 12, and the amount of discharge is measured. is detected, and when the select lever is operated to the D range, the capacity of the air conditioner blower 5 is switched based on the detection result, so the charging/discharging balance of the battery 11 can be accurately detected, and the alternator 14 It is possible to reliably prevent the battery from running out of power during idling operation when the power generation capacity of the system is reduced.

Also, in this example, the capacity of the air conditioner blower 5 is reduced to high-middle or high-low based on the magnitude of the discharge amount, so the responsiveness of preventing the battery from dying is improved compared to the first example. can be improved.

In addition, in this example, idle up control is performed when the operating position of the select lever is in the non-operating range (for example, neutral range), so alternator 1
It is possible to prevent the battery from running out by increasing the power generation capacity of 4, and it is also possible to maintain the capacity of the air conditioner.

In the first embodiment, it was determined whether the vehicle was stopped based on the vehicle speed = O, but it may be determined that the vehicle is stopped when the speed is less than 31 mph, for example.

Furthermore, in the one-second routine of the first embodiment, a brake operation determination process based on the detection signal of the brake switch may be added to detect the stopped state of the vehicle.

Furthermore, in the first embodiment, when the time measured by the timer 1a reaches the predetermined time T1 (=30 seconds), the capacity of the blower 5 is reduced to high-middle. It can also be used for city driving, which requires frequent starting and stopping.

Further, in the first embodiment, the compressor of the air conditioner is a variable capacity compressor, and when it is detected that the vehicle is stopped, the select lever is operated to the D range, and the operation of the air conditioner is detected. When the compressor capacity is lowered, the load on the engine is reduced, and as a result, the engine speed is increased to improve the alternator's generating capacity, and the idle speed control valve is used to increase the amount of intake air. The power generation capacity of the alternator may be improved by increasing the engine speed in the range state even a little.

Further, in the first embodiment, the capacity of the blower 5 is set to middle (
The blower 5 may be turned off after a predetermined period of time (for example, 20 seconds) has elapsed after the temperature is lowered from medium to low.

Further, in the second embodiment, the discharge amount of the battery 11 is detected when the vehicle is stopped when the engine speed is the idle speed, but the discharge amount of the battery 11 can be detected regardless of whether the vehicle is running or stopped. It may also be detected.

Furthermore, when reducing the capacity of the blower 5 in the second embodiment, if outside air is being introduced, switching to internal air circulation can suppress a decrease in cooling capacity.

[Effects of the Invention] As detailed above, according to the present invention, in a vehicle equipped with an automatic transmission equipped with an air conditioner, the electrical load of the air conditioner is reduced according to the charging/discharging balance of the battery, thereby preventing the battery from running out. Can be done.

Further, the charging/discharging balance detecting means includes a stop detecting means for detecting a stopped state of the vehicle, an operating range detecting means for detecting that the operation position of a select lever constituting the automatic transmission is in an operating range, and the stop detecting means for detecting a stop state of the vehicle. When the stop of the vehicle is detected by the means and the operating range detecting means detects that the select lever is operated to the operating range, a timing operation is performed and a signal is sent to the air conditioner control means after a predetermined period of time has elapsed. and a time measuring means that outputs a timer that outputs a timer that outputs a timer, so that the discharge current of the battery is larger than the charging current when the select lever is operated in the operating range when the vehicle is stopped and the engine speed is at the idle speed. It is possible to reduce the electrical load on the air conditioner by indirectly determining this, and it is possible to prevent the battery from dying during idling operation when the alternator's power generation capacity is reduced.

Furthermore, by using a charging/discharging current detection resistor that directly detects the charging/discharging current of the battery as the charging/discharging balance detecting means, it is possible to accurately detect the discharge amount of the battery, and it is possible to reliably prevent the battery from dying.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment embodying the present invention, in which Figure 1 is an electrical block diagram, Figure 2 is a flowchart for explaining the operation, and Figure 3 is for explaining the operation. Fig. 4 is a graph showing the relationship between engine speed and alternator generated current, Fig. 5 to 8 show the second embodiment, Fig. 5 is an electric block diagram, Figure 6 is a flowchart for explaining the action;
FIG. 7 is a time chart for explaining the action, and FIG. 8 is a graph showing the relationship between the amount of discharge of the battery and the number of rotations of the blower. In the figure, 1 is a control circuit as an air conditioner control means, 1a is a timer constituting a charge/discharge balance detection means, 2 is the same (neutral switch), 3 is also a vehicle speed sensor, 4 is an air conditioner switch as an air conditioner drive detection means, 5 1 is a blower, 11 is a battery, and 12 is a resistance for detecting charging/discharging current as means for detecting charging/discharging balance. Patent applicant Nippondenso Co., Ltd. Agent Patent attorney On 1) Hironobu Drawing No. 8, Figure 3, Figure 4 Figure 8 Detection of discharge balance Figure 8 Drawing No. 4

Claims (1)

[Scope of Claims] 1. In a vehicle equipped with an automatic transmission and equipped with an air conditioner, an air conditioner drive detection means for determining whether the air conditioner is in operation, and a charger for detecting the charging/discharging balance of a battery installed in the vehicle. The present invention is characterized by comprising a discharge balance detection means, and an air conditioner control means for controlling the capacity of the air conditioner based on the detection result by the charge/discharge balance detection means when the drive of the air conditioner is detected by the air conditioner drive detection means. Car air conditioner control device. 2. The charging/discharging balance detecting means includes: a stop detecting means for detecting a stopped state of the vehicle; an operating range detecting means for detecting that the operation position of the select lever constituting the automatic transmission is in the operating range; and the stop detecting means. a stoppage of the vehicle is detected by the means, and
Claim 1 further comprising: a timer for performing a timekeeping operation when the operating range detecting means detects that the select lever is operated in the operating range, and outputting a signal to the air conditioner control means after a predetermined period of time has elapsed. The car air conditioner control device described. 3. The car air conditioner control device according to claim 1, wherein the charging/discharging balance detecting means is a charging/discharging current detection resistor that directly detects the charging/discharging current of the battery.