JPH04306124A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To obtain an air conditioner for vehicle that can alleviate deceleration shock of the vehicle generated when a compressor is operated. CONSTITUTION:When it is detected by an acceleration detection circuit in an engine control circuit 12 that a vehicle is accelerated, a signal for forcibly making the capacity of a variable capacity compressor 3 to a minimum level, is sent to a capacity controller 4 by an air conditioning control circuit 15. When the vehicle is sufficiently accelerated until an ATM 2 is shifted up, deceleration shock is generated on the vehicle due to the shifting up, and the capacity of the variable capacity compressor 3 is increased by the air conditioning control circuit 15 at the same time as the shifting up, so as to alleviate the deceleration shock. As for the amount to be increased, the car speed of the vehicle when it is shifted up, engine rotational number, and the capacity to be increased based on gear ratio, are calculated, and by sending a signal to the capacity controller 4 so that the amount of increase thus obtained is increased in the capacity, the shock felt by a passenger will be constantly small.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner, and is used, for example, as a device for alleviating the deceleration shock of a vehicle that occurs when a compressor is started.

0002

2. Description of the Related Art As a conventional technique for a device for alleviating the shift shock of a transmission, there is a technique disclosed in Japanese Utility Model Application Publication No. 101048/1983.

According to the above-mentioned prior art, in order to improve the acceleration performance of the vehicle, a downshift to first or second gear is performed during acceleration (for example, when the accelerator pedal is strongly depressed). Also, when accelerating, the air conditioner (compressor)
When the compressor is in operation, the compressor is forcibly stopped to reduce the load on the engine caused by the compressor.

0004

[Problems to be Solved by the Invention] However, as in the prior art described above, when the compressor is forcibly stopped when the vehicle is accelerating, the timing at which the compressor restarts and the compressor load is applied to the engine is either in the acceleration state or at the end of acceleration. If the vehicle is in a constant speed running state later on, the occupant will inevitably feel the deceleration shock of the vehicle that occurs at that time. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a vehicle air conditioner that can alleviate the deceleration shock of a vehicle that occurs when a compressor is restarted.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a vehicle air conditioner for a vehicle that is equipped with an engine that drives the vehicle and a transmission mechanism that has a plurality of transmission gears that can be connected to the engine. In the apparatus, an acceleration detecting means for detecting an acceleration state of the vehicle, a shift change detecting means for detecting a shift change state of the plurality of transmission gears of the transmission mechanism, and a capacity connected to the engine to vary the displacement volume. a variable capacity compressor with control means;
When the acceleration detecting means detects that the vehicle is being accelerated, the capacity of the variable displacement compressor is reduced, and when the shift change detecting means detects that the transmission mechanism is upshifting, the The gist of the present invention is a vehicle air conditioner that includes an air conditioner control device that increases the capacity of a variable capacity compressor.

[0006]

[Operation] First, the acceleration detection means detects that the vehicle is being accelerated, and the air conditioner control device receives the detection result and sends a signal to the capacity control device to reduce the capacity of the variable capacity compressor. In other words, when the vehicle accelerates, the capacity of the variable capacity compressor is reduced, reducing the load on the engine caused by driving the compressor and improving the acceleration performance of the vehicle.

[0007] Furthermore, when the speed change mechanism shifts up after the vehicle has finished accelerating, the shift change detection means detects that the shift is up, and the air conditioner control device inputs the detection result and changes the capacity of the variable capacity compressor. Sends a signal to the capacity controller to increase.

[0008] In this way, by increasing the capacity of the variable capacity compressor at the same time that the transmission mechanism is upshifting and an acceleration shock is about to occur in the vehicle, when the compressor whose cooling capacity has weakened is restarted, The engine or vehicle deceleration shock that occurs is canceled out, and the vehicle deceleration shock felt by the occupants is always small. Further, the amount of capacity increase can be arbitrarily set to suit the characteristics of the vehicle.

[0009]

[Effects of the Invention] According to the present invention, it is possible to alleviate the shock that occurs when the compressor, whose cooling capacity has weakened once, is restarted, so that the shock felt by the occupants due to the restart of the compressor is always small, and the vehicle This has the effect of providing a vehicle air conditioner that can improve comfort.

0010

[Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
The explanation will be based on. First, the configuration of the first embodiment will be briefly explained based on FIG. 1. Here, FIG. 1 is a block configuration diagram showing the configuration of the first embodiment. As shown in Fig. 1, an engine 1 is connected to an automatic transmission 2 (
engine 1 (hereinafter referred to as ATM 2).
The output is transmitted to wheels (not shown) via the ATM 2.

Variable capacity compressor 3, capacity control device 4
, the magnetic clutch 5, the condenser 6, the expansion valve 7, and the evaporator 8 are well-known components that constitute the air conditioning system of this vehicle. Further, the vehicle interior includes a vehicle speed sensor 9, an engine rotation 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.

By the way, the variable capacity compressor 3, condenser 6, expansion valve 7, and evaporator 8 each have one
It is a component that makes up two refrigeration cycles, and cools the interior of the vehicle by circulating refrigerant between the refrigeration cycles.

The capacity control device 4 is a variable capacity compressor 3
The variable capacity compressor 3 is connected to, for example, a known type having a solenoid valve to control the amount of refrigerant discharged and sucked in by the variable capacity compressor 3. In addition, the magnetic clutch 5 is connected to the variable displacement compressor 3 and is also connected to the engine 1, and by turning on and off the magnetic clutch 5, the rotation of the engine 1 is transmitted to the variable displacement compressor 3. There may be none.

The engine control circuit 12 includes an acceleration detection circuit 11 that detects the acceleration state of the vehicle, that is, the state in which the accelerator is depressed, based on a signal from a throttle sensor that detects the opening degree of a throttle valve (not shown). A.T.
The M control circuit 13 also has a shift position setting circuit 14 that determines whether to downshift or upshift gears based on the outputs of the vehicle speed sensor 9, engine speed sensor 10, etc., and outputs the determination result to the ATM 2. .

As shown in FIG. 2, the air conditioner control circuit 15 turns on and off the magnetic clutch 5, outputs a signal to the capacity control device 4 of the variable capacity compressor 3, and controls the opening of a damper (not shown) based on the set temperature, vehicle interior temperature, etc. In addition to performing well-known normal air conditioner control such as temperature control, a minimum capacity control circuit 16, a time setting circuit 17, which performs control specific to the first embodiment;
It has a time determination circuit 18, a shift-up detection circuit 19, a capacity increase amount 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 that the vehicle is being accelerated by 1,
A signal is sent to the capacity control device 4 to forcibly set the capacity of the variable capacity compressor 3 to the minimum. What is forced here?
This means ignoring the capacity control in normal air conditioner control and forcing the capacity to the lowest level. Furthermore, the fact that the engine control circuit 12 has determined that the vehicle is being accelerated means that it has been determined that the accelerator pedal is being strongly depressed.

The shift-up detection circuit 19 detects whether the ATM control circuit 13 has instructed the ATM 2 to shift up. In addition, the capacity increase amount calculation circuit 20 calculates the
The amount of forced capacity increase of the variable capacity compressor 3 is calculated. Then, a calculation signal is sent to the capacity increase circuit 21 to forcibly increase the capacity of the variable capacity compressor 3 by the calculated amount. Further, the capacity increasing circuit 21 forcibly reduces the effective value of the voltage applied to the electromagnetic valve in the capacity control device 4.

Next, the operation of the first embodiment will be explained with reference to FIGS. 2 and 3.
The explanation will be based on. Note that Figure 3 shows the air conditioner control circuit 15.
2 is a flowchart showing the calculation process of FIG. Each circuit in the air conditioner control circuit 15 shown in FIG. 2 is actually constituted by a microcomputer having data recording means, central processing means, input/output circuits, and command recording means.

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). At step 101, it is in an acceleration state (
YES), that is, if it is determined that the accelerator pedal has been strongly depressed, a signal is generated from the output circuit of the microcomputer in the next step 102, and is sent to the variable capacity compressor 3 via a digital-to-analog converter (not shown).
The voltage applied to the electromagnetic valve of the capacity control device 4 is forcibly set to the maximum voltage so as to minimize the discharge capacity. In other words, when the vehicle is accelerating, the discharge capacity is set to the minimum to reduce the load on the engine's compressor and improve the acceleration of the vehicle. Further, if it is determined in step 101 that the vehicle is not in an acceleration state (NO), the process is ended without doing anything.

When the capacity of the variable capacity compressor 3 reaches the minimum in step 102, a pre-stored predetermined time is compared with the actual time during which the acceleration state continues in step 103.

[0021] If the acceleration state continues for a predetermined time or longer (YES), this is the case, for example, when the vehicle is climbing a slope. In this case, if the capacity of the variable capacity compressor 3 is left at the lowest level forever, the effectiveness of the air conditioner will deteriorate and the interior of the vehicle will become hot. Therefore, in such a case, after a predetermined period of time has elapsed, the forced minimum capacity control is canceled in step 104 to return to the normal air conditioner control flow, and the process ends.

[0022] When it is determined in step 103 that the acceleration state of the vehicle has not continued for a predetermined time (NO),
Next, it is determined whether a shift up command has been issued based on the signal from the ATM control circuit 13 (step 10).
5).

If it is determined in step 105 that no upshift command has been issued (NO), this means that the acceleration state is still continuing, and the process returns to step 101 again.

On the other hand, if it is determined in step 105 that a shift-up command has been issued (YES), the gear will be shifted up, but normally at this time the occupant would receive an acceleration shock due to the shift-up. However, in the first embodiment of the present invention, the capacity of the variable capacity compressor 3 is increased at the same time as a shift-up command is issued, and the increased engine load due to the increased capacity alleviates or offsets the shift shock acting on the occupants. Let it happen.

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

The method of calculating the amount of increase in capacity, which is the processing in step 107, will now be explained. First step 1
At 06, vehicle speed V, engine speed Ne, and gear ratio ε
Detect. Then, V and N detected in step 106
In step 107, e and ε are calculated by substituting them into Equation 1 below.

[0027]

[Equation 1] (capacity increase amount)=P(Ne-Q*ε*V) where P and Q are constants.

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

The case of an automatic transmission has been described above in detail as the first embodiment. Next, as a second embodiment, a manual transmission (hereinafter referred to as MTM)
).

In the case of MTM, a limit switch is provided at each shift position of 1st, 2nd, 3rd, 4th, and 5th gear, and the current shift position is determined by detecting which limit switch is on. You can know. Also, by doing so, you can also know whether or not the gear has been shifted up.

As described above, in the case of MTM as well, it is possible to know whether an upshift has been made. After that, as in the first embodiment, when the acceleration detection circuit determines that the vehicle is being accelerated, the capacity of the variable capacity compressor is set to the minimum. If it is determined that the acceleration state has continued for a predetermined period of time or more and an upshift has been performed, the amount of increase in the capacity of the variable capacity compressor is calculated in accordance with the shift shock at that moment at the moment when the vehicle driving clutch is engaged after the upshift, and the amount of increase in capacity of the variable displacement compressor is calculated. Forces the capacity to increase by a large amount for a few seconds.

Similarly to the first embodiment, the capacity increase amount in the case of MTM is calculated based on the above equation 1 by detecting the vehicle speed V, the engine rotation speed Ne, and the gear ratio ε. As in the first and second embodiments above, by increasing the capacity of the variable capacity compressor according to the degree of shift shock that occurs when upshifting, it is possible to shift under any acceleration condition. Even when the speed is increased, the shift shock felt by the occupants is always small.

As a modification of the first and second embodiments described above, a capacity increase amount is set to the maximum capacity in step 104 in FIG. The driving voltage may be output from the output circuit to the solenoid valve in the capacity control device 4 for a predetermined period of time via a digital-to-analog converter (not shown).

[0034] Also, as a method for calculating the capacity increase amount, vehicle speed V,
In addition to the gear ratio ε, the opening degree A of the throttle valve may be detected from a throttle sensor (not shown) and calculated by substituting it into Equation 2 below. Note that R, S, and T are constants.

[0035]

[Formula 2] (capacity increase amount) = R (S*A-T*ε*V) In the above embodiment, ATM2 and MTM are transmission mechanisms. The acceleration detection circuit 11 is acceleration detection means, and the upshift detection circuit 19 is shift change detection means. Further, the capacity control device 4 is a capacity control means, and the air conditioner control circuit 15 is an air conditioner control device.

[Brief explanation of drawings]

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

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

FIG. 3 is a flowchart showing calculation processing of the air conditioner control circuit of the first embodiment.

[Explanation of symbols]

1 Engine 2 ATM 3. Variable capacity compressor 4 Capacity control means 11 Acceleration detection means 15 Air conditioner control means 19 Shift change detection means

Claims (1)

[Claims] 1. A vehicle air conditioner for a vehicle comprising an engine that drives the vehicle and a transmission mechanism having a plurality of transmission gears that can be connected to the engine, comprising: acceleration detection means for detecting an acceleration state of the vehicle; , a shift change detection means for detecting a shift change state of the plurality of transmission gears of the transmission mechanism; a variable capacity compressor connected to the engine and having a capacity control means for varying a discharge capacity; The capacity of the variable displacement compressor is reduced when the acceleration detection means detects that the variable displacement compressor is shifted up, and when the shift change detection means detects that the transmission mechanism shifts up, the capacity of the variable displacement compressor is reduced. An air conditioner for a vehicle, comprising: an air conditioner control device that increases the air conditioner.