JP3141415B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and is used, for example, in an apparatus for alleviating a vehicle deceleration shock generated when a compressor is started.

[0002]

2. Description of the Related Art As a prior art of a device for alleviating a shift shock of a transmission, there is a technology disclosed in Japanese Utility Model Laid-Open No. 62-101048.

According to the above prior art, the shift down to the first speed or the second speed is performed during acceleration (for example, when the accelerator is depressed strongly) for the purpose of improving the acceleration performance of the vehicle. Air conditioner (compressor) during acceleration
When is operated, the compressor is forcibly stopped to reduce the load on the engine by the compressor.

[0004]

When the compressor is forcibly stopped at the time of vehicle acceleration as in the prior art, the timing at which the compressor is restarted and the load of the compressor is applied to the engine is in the accelerating state or the end of acceleration. When the vehicle is in a later constant-speed running state, the occupant inevitably feels the vehicle deceleration shock generated at that time. Accordingly, an object of the present invention is to provide a vehicle air conditioner capable of reducing a vehicle deceleration shock generated when a compressor is restarted in order to solve the above-described problem.

[0005]

According to the present invention, there is provided an air conditioner for a vehicle, comprising: an engine for driving the vehicle; and a transmission mechanism having a plurality of transmission gears connectable to the engine. In the apparatus, acceleration detection means for detecting an acceleration state of the vehicle, shift change detection means for detecting a shift change state of the plurality of transmission gears of the transmission mechanism, and
An acceleration shock amount detecting means for the vehicle, a variable displacement compressor coupled to the engine and having a displacement control means for varying a discharge displacement, and a compressor when the acceleration detecting means detects that the vehicle is being accelerated. the capacity of the variable capacity compressor is reduced, and when the transmission mechanism is the shift change detection means that the upshift is detected, the acceleration sucrose capacity of the variable capacity compressor
The gist of the present invention is a vehicle air conditioner including an air conditioner control device that increases the amount of air in accordance with the amount detected by the amount-of-lock detection unit .

[0006]

First, the acceleration detecting means detects that the vehicle is being accelerated, and the air conditioner control device which has inputted the detection result sends a signal to the displacement control device so as to reduce the displacement of the variable displacement compressor. That is, when the vehicle accelerates, the capacity of the variable displacement compressor is reduced, and the load on the engine due to the driving of the compressor is reduced to improve the acceleration performance of the vehicle.

Further, when the irregular mechanism shifts up after the acceleration state of the vehicle ends, the air conditioner control device which detects the shift up by the soft change detecting means and inputs the result of the detection changes the capacity of the variable displacement compressor. Addition
A signal is sent to the displacement control device so as to increase according to the detection amount of the quick shock amount detection means .

As described above, the speed change mechanism shifts up to cause an acceleration shock to the vehicle and, at the same time, the vehicle accelerates.
By increasing the capacity of the variable displacement compressor corresponding to the shock amount, the deceleration shock of the engine or the vehicle that occurs when the compressor once having reduced cooling capacity is restarted is canceled, and the deceleration shock of the vehicle felt by the occupant is always small. It will be. Further, the capacity increase amount can be set arbitrarily so as to match the characteristics of the vehicle.

[0009]

According to the present invention, the variable displacement compressor is stopped.
Drive with a small capacity without stopping, and
By increasing the compressor capacity according to the
In addition, the shock that occurs when the compressor whose cooling capacity has weakened is restarted can be alleviated, so that the shock due to the restart of the compressor is always small for the occupants, and the vehicle comfort can be improved. There is an effect that an air conditioner can be obtained.

[0010]

1 to 3 show a first embodiment of the present invention.
It will be described based on. First, the configuration of the first embodiment will be briefly described based on FIG. FIG. 1 is a block diagram showing the configuration of the first embodiment. As shown in FIG. 1, the engine 1 is an automatic transmission 2
(Hereinafter, referred to as ATM2), so that the output of the engine 1 is transmitted to wheels (not shown) via the ATM2.

A variable displacement compressor 3, a displacement control device 4, a magnet clutch 5, a condenser 6, an expansion valve 7,
The evaporator 8 is a well-known one that forms an air conditioner of the vehicle. Further, a vehicle speed sensor 9, an engine speed sensor 10, an engine control circuit 12 having an acceleration detection circuit 11, an ATM control circuit 13, and an air conditioner control circuit 15 shown in FIG.

The variable capacity compressor 3, the condenser 6, the expansion valve 7, and the evaporator 8 each have one
It is a component part of one refrigeration cycle, and cools the interior of the vehicle while circulating the refrigerant between the refrigeration cycles.

The displacement control device 4 includes a variable displacement compressor 3
The variable capacity compressor 3 controls the amount of refrigerant to be discharged and suctioned. The magnetic clutch 5 is connected to the variable displacement compressor 3 while being connected to the engine 1. By turning the magnet clutch 5 on and off, the rotation of the engine 1 is transmitted to the variable displacement compressor 3. Or not.

The engine control circuit 12 has an acceleration detection circuit 11 for detecting an acceleration state of the vehicle, that is, a state in which an accelerator pedal is depressed, based on a signal from a throttle sensor for detecting the opening of a throttle valve (not shown). AT
The M control circuit 13 also has a shift position setting circuit 14 that determines whether to perform gear downshifting or upshifting based on outputs from the vehicle speed sensor 9, the engine speed sensor 10, and the like, and outputs the determination result to the ATM 2. .

As shown in FIG. 2, the air conditioner control circuit 15 turns on / off the magnet clutch 5, outputs a signal to the capacity control device 4 of the variable capacity compressor 3, and opens a damper (not shown) based on the set temperature and the vehicle interior temperature. In addition to performing well-known ordinary air conditioner control such as control of the degree, a minimum capacity control circuit 16 and a time setting circuit 1 for performing control specific to the first embodiment.
7, a time determination circuit 18, a shift-up detection circuit 19, a capacity increase calculation circuit 20, and a capacity increase circuit 21.

The minimum capacity control circuit 16 includes the acceleration detection circuit 1
When it is determined by 1 that the vehicle is accelerating,
A signal is sent to the displacement control device 4 to force the displacement of the variable displacement compressor 3 to the minimum. Here, compulsory means
This means that capacity control in normal air conditioner control is ignored and the capacity is forcibly reduced to the minimum. When the engine control circuit 12 determines that the vehicle is accelerating, it means that it is determined that the accelerator pedal is strongly depressed.

The shift-up detecting circuit 19 detects whether the ATM control circuit 13 has instructed the ATM 2 to shift up. Further, the capacity increase calculation circuit 20 calculates the forced capacity increase of the variable capacity compressor 3 according to the vehicle speed, the engine speed and the gear ratio, which are acceleration detecting means, as described later. Then, a calculation signal is sent to the capacity increasing circuit 21 so as to forcibly increase the capacity of the variable capacity compressor 3 by the calculated amount. Further , the capacity increasing circuit 21
Forces the effective value of the voltage applied to the solenoid valve in the capacity control device 4 to decrease.

Next, the operation of the first embodiment will be described with reference to FIGS.
It will be described based on. FIG. 3 shows an air conditioner control circuit 15.
4 is a flowchart showing the calculation processing of FIG. Each circuit in the air conditioner control circuit 15 shown in FIG. 2 is actually constituted by a microcomputer having a data recording unit, a central processing unit, an input / output circuit, and a command recording unit.

First, the acceleration state of the vehicle is determined based on the output from the acceleration detection circuit 11 in the engine control circuit 12 (step 101). If it is determined in step 101 that the vehicle is accelerating (YES), that is, the accelerator pedal is strongly depressed, a signal is output from the output circuit of the microcomputer in the next step 102, and the signal is output via a digital-analog converter (not shown). The voltage applied to the solenoid valve of the displacement control device 4 is forcibly set to the highest voltage so that the discharge displacement of the variable displacement compressor 3 is minimized. That is, when the vehicle is accelerating, the discharge capacity is minimized to reduce the load on the compressor of the engine, thereby improving the acceleration of the vehicle. Step 101
If it is determined that the vehicle is not in the accelerated state (NO), the process ends without doing anything.

When the capacity of the variable displacement compressor 3 becomes minimum in step 102, a predetermined time stored in advance is compared with a time during which the acceleration state is actually continued in step 103.

The case where the acceleration state continues for a predetermined time or more (YES) is, for example, a case where the vehicle is climbing a hill. In this case, if the capacity of the variable capacity compressor 3 is kept to the minimum, the effectiveness of the air conditioner becomes worse, and the cabin becomes hot. Therefore, in such a case, after the predetermined time elapses, the forcible minimum capacity control is released in step 104, the flow returns to the normal air-conditioning control flow, and the process ends.

If it is determined in step 103 that the acceleration state of the vehicle has not continued for a predetermined time (NO),
This time, it is determined whether or not an upshift command has been issued based on a signal from the ATM control circuit 13 (step 10).
5).

If it is determined in step 105 that the shift-up command has not been issued (NO), it means that the vehicle is still accelerating, and the process returns to step 101 again.

On the other hand, if it is determined in step 105 that an upshift command has been issued (YES), the gears are upshifted. At this time, the occupant normally receives an acceleration shock due to upshifting. However, in the first embodiment of the present invention, the capacity of the variable displacement compressor 3 is increased at the same time as the shift-up command is issued, and the shift load acting on the occupant is reduced or offset by the increase in the engine load due to the increased capacity. Let it do.

That is, in order to reduce the shift shock,
If YES is determined in step 105, step 1
At 06, the vehicle speed V, the engine speed Ne, and the gear ratio ε at the moment of upshifting are detected from signals from the vehicle speed sensor 9, the engine speed sensor 10, and the like. Then, based on the detection result, the capacity increase amount calculation circuit 20 calculates the increase amount of the capacity to be increased (step 107), and in step 108, increases the capacity of the variable displacement compressor 3 by the increase amount calculated in step 107. A signal is sent to the capacity control device 4 so as to perform the operation.

Here, a description will be given of a method of calculating the amount of increase in capacity, which is the processing in step 107. First step 1
At 06, the vehicle speed V, the engine speed Ne, and the gear ratio ε are detected. Then, V, Ne detected in step 106,
In step 107, ε is obtained by substituting into equation 1 below.

[0027]

## EQU1 ## (Capacity increase) = P (Ne-Q * .epsilon. * V) Here, P and Q are constants.

In step 107, the amount of increase in capacity is calculated based on the above formula 1, and in step 108, the capacity of the variable displacement compressor 3 is increased by the amount of increase for a predetermined time (several seconds).
A signal is sent to the capacity control device 4 so as to increase the amount by just the amount, and the process ends. Then, the control returns to the normal air conditioner control.

The automatic transmission according to the first embodiment has been described in detail. Next, as a second embodiment, a manual transmission (hereinafter referred to as MTM)
Will be described.

In the case of MTM, first speed, second speed, third speed,
The current shift position can be known by providing a limit switch at each of the shift positions of the first and fifth speeds and detecting which limit switch is on. By doing so, it is also possible to know whether or not a shift has been made.

As described above, even in the case of the MTM, it can be known whether or not the upshift has been performed. Thereafter, as in the first embodiment, when the acceleration detection circuit determines that the vehicle is being accelerated, the capacity of the variable displacement compressor is minimized. If it is determined that the vehicle has been shifted up for more than a predetermined time, the amount of increase in the capacity of the variable displacement compressor is calculated in accordance with the shift shock at that moment at which the vehicle driving clutch is engaged after the upshift. Forcibly increase the volume by a large amount for a few seconds.

In the case of the MTM, as in the first embodiment, the amount of increase in the capacity is the vehicle speed V, the engine speed Ne, and the gear ratio ε.
Is calculated based on the above equation (1). As in the first and second embodiments described above, by increasing the capacity of the variable displacement compressor in accordance with the degree of the shift shock generated when upshifting, the shift can be performed under any acceleration condition. Even if it goes up, the shift shock felt by the occupant is always small.

As a modification of the first and second embodiments, a capacity increase amount is set to the maximum capacity in step 104 in FIG. 3, and in step 108 such that the set increase amount is obtained. A drive voltage may be output from the output circuit to a solenoid valve in the capacity control device 4 for a predetermined time via a digital / analog converter (not shown).

As a method of calculating the capacity increase, the vehicle speed V,
In addition to the gear ratio ε, the throttle valve opening A may be detected from a throttle sensor (not shown) and may be calculated by substituting it into the following equation (2). Note that R, S, and T are constants.

[0035]

## EQU2 ## (Amount of capacity increase) = R (S * A-T * .epsilon. * V) In the above embodiment, ATM2 and MTM are transmission mechanisms. The acceleration detection circuit 11 is an acceleration detection means, and the upshift detection circuit 19 is a shift change detection means. The capacity control device 4 is a capacity control unit, and the air conditioner control circuit 15 is an air conditioner control device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a first embodiment.

FIG. 2 is an electrical configuration diagram of a control circuit according to the first embodiment.

FIG. 3 is a flowchart illustrating a calculation process of an air conditioner control circuit according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 ATM 3 Variable displacement compressor 4 Capacity control means 11 Acceleration detection means 15 Air conditioner control means 19 Shift change detection means

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60H 1/32 623 B60H 1/32 624

Claims (1)

(57) [Claims] 1. An air conditioner for a vehicle, comprising: an engine that drives a vehicle; and a transmission mechanism having a plurality of transmission gears that can be connected to the engine. An acceleration detection unit that detects an acceleration state of the vehicle. Shift change detection means for detecting a shift change state of the plurality of transmission gears of the transmission mechanism;
And click amount detecting means, coupled to said engine, said variable capacitance discharge capacity and a variable displacement compressor having a capacity control means for varying, upon detecting that the acceleration detecting means that the vehicle is being accelerated When the shift change detection means detects that the capacity of the compressor is reduced and the shift mechanism shifts up, the capacity of the variable displacement compressor is detected by the acceleration shock amount detection means.
An air conditioner for a vehicle, comprising: an air conditioner control device that increases the amount according to the output .