JP4092622B2 - Air conditioner control device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular air conditioner control device, and more particularly to a vehicular air conditioner control device including a brake booster mechanism that uses a negative pressure of an intake pipe to reduce a brake pedal force when decelerating. The present invention relates to a vehicle air conditioner control device that reduces air conditioning and improves air conditioning performance and drivability.
[0002]
[Prior art]
Some vehicles are equipped with an air conditioner (also referred to as “A / C”), and the air conditioning of the passenger compartment is performed by this air conditioner. The air conditioner drives an air conditioner compressor by the rotational force of an internal combustion engine mounted on a vehicle.
[0003]
A vehicle air conditioner control device is disclosed in Japanese Patent Application Laid-Open No. 7-323722. An air conditioner control device for a vehicle disclosed in this publication detects a vehicle speed in a vehicle having an air conditioner system that air-conditions a vehicle interior and a brake booster mechanism that reduces brake pedal force during deceleration using intake pipe pressure. A vehicle speed sensor is provided, and when the vehicle is decelerating by inputting a detection signal from the vehicle speed sensor, a control means is provided to control the intake pipe pressure acting on the brake booster mechanism to be substantially constant by stopping the air conditioner system. In a vehicle that uses a brake booster mechanism that uses the intake pipe pressure to reduce the brake pedal force during deceleration, an appropriate deceleration feeling is ensured.
[0004]
Also, there is one disclosed in JP-A-9-144573. When the air conditioner cut condition is satisfied and the air conditioner cut release condition is not satisfied when the air conditioner switch is ON and the transmission is an automatic transmission, When the air conditioner cut condition is no longer met or when the air conditioner cut release condition is met, it is determined whether the air conditioner is currently being cut or not, and if necessary, the air conditioner cut is released. The brake pedal depression force is reduced by controlling the operation of the auxiliary machine using the engine output as a drive source so that a large suction negative pressure can be obtained when the engine is cold and decelerated.
[0005]
Further, there is one disclosed in JP-A-10-166849. The air conditioner control method disclosed in this publication detects an intake pipe pressure of an internal combustion engine when decelerating in an air conditioner for a vehicle interior air conditioner that has a function of reducing the depression force of a brake pedal using the intake pipe pressure of the internal combustion engine. If the intake pipe pressure is within a preset range, the operation of the air conditioner is allowed, the frequency of air conditioner cuts during deceleration is reduced, and the air conditioning performance of the air conditioner and the drivability of the vehicle are improved. I am trying.
[0006]
[Problems to be solved by the invention]
By the way, in a conventional vehicle air conditioner control device that includes an air conditioner that is driven by an internal combustion engine and a brake booster mechanism that reduces the brake pedal force by using the intake pipe negative pressure of the internal combustion engine, Is prohibited to increase the intake pipe negative pressure and prevent the brake pedal force from increasing.
[0007]
In addition to the above-described vehicle air conditioner control device, if the intake pipe negative pressure is detected and the intake pipe negative pressure is secured as much as necessary for the operation of the brake booster mechanism, the operation of the air conditioner is permitted. There were things that reduced the frequency of operation prohibition and improved the comfort in the passenger compartment.
[0008]
However, in contrast to the above-described conventional vehicle air conditioner control device, it has been desired to restrict the prohibition of the operation of the air conditioner when the brake pedal force is required and to further improve the comfort in the passenger compartment.
[0009]
[Means for Solving the Problems]
Accordingly, in order to eliminate the above-described disadvantages, the present invention provides a vehicle air conditioner provided with an air conditioner driven by an internal combustion engine and a brake booster mechanism that reduces the brake pedal force by utilizing the intake pipe negative pressure of the internal combustion engine. In the control device, when the speed before deceleration of the vehicle is lower than the first set speed, control is performed so that the operation of the air conditioner is not prohibited, the vehicle is in a deceleration state in which the brake is operated, and the vehicle is in the first state. A predetermined speed that is within a speed range of a set speed and a second set speed that is higher than the first set speed, the speed change amount is equal to or greater than the set speed change amount, and the intake pipe negative pressure is necessary for the operation of the brake booster mechanism setting the operation of the air conditioning is prohibited predetermined time when the negative pressure or under a is condition is satisfied, after prohibiting the operation of the predetermined time air conditioning, the deceleration shape which the vehicle is operated brake The vehicle is within the speed range of the first set speed and the second set speed, the speed change amount is greater than or equal to the set speed change amount, and the intake pipe negative pressure is equal to the brake booster mechanism. The prohibition of the operation of the air conditioner is continued until the condition that is equal to or lower than the predetermined negative pressure required for operation is not satisfied, and the speed of the vehicle changes from the upper side to the lower side through the first set speed. Is characterized in that the intake pipe negative pressure is controlled in order to secure the intake pipe negative pressure acting on the brake booster mechanism by prohibiting the operation of the air conditioner to a third set speed lower than the first set speed. To do.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
By inventing the air conditioner as described above, the air conditioner is operated only when the braking force is insufficient due to the speed change amount and the intake pipe negative pressure in a speed range where the boosting effect of the brake booster mechanism is prohibited by prohibiting the operation of the air conditioner. Prohibits the frequency of prohibition of air conditioner operation and improves comfort in the passenger compartment.
[0011]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0012]
1 to 4 show a first embodiment of the present invention. In FIG. 2, 2 is a vehicle air conditioner control device.
[0013]
This vehicle air conditioner control device 2 includes an air conditioner (not shown) driven by an internal combustion engine (not shown) and a brake booster mechanism (not shown) that reduces the brake pedal force by using the intake pipe negative pressure of the internal combustion engine. And.
[0014]
The vehicle air conditioner control device 2 has an engine controller (also referred to as “ECM”) 4 as shown in FIG. 2. On the input side of the engine controller 4, a vehicle speed sensor 6 that detects a vehicle speed, An intake pressure sensor 8 that detects intake pipe negative pressure, an atmospheric pressure sensor 10 that detects atmospheric pressure, and a brake switch (also referred to as “BRK SW”) 12 that is turned on when the brake is operated are connected. At the same time, an air conditioner controller 14 is connected to the output side of the engine controller 4.
[0015]
In general, the atmospheric pressure sensor 10 and the air conditioner controller 14 are built in the engine controller 4.
[0016]
The vehicular air conditioner control device 2 is in a decelerating state in which the vehicle operates a brake, and the vehicle is at a first set speed V1 (Vh) and a second set speed V2 that is higher than the first set speed V1 (Vh). And the condition that the speed change amount is not less than the set speed change amount A1 and the intake pipe negative pressure is not more than a predetermined set negative pressure P1 required for the operation of the brake booster mechanism is satisfied. Has a configuration in which the intake pipe negative pressure is controlled so as to ensure the intake pipe negative pressure acting on the brake booster mechanism by prohibiting the operation of the air conditioner for a predetermined time T1.
[0017]
More specifically, the condition of the vehicle air conditioner control device 2 is that a deceleration state in which the vehicle operates a brake, that is, the brake switch 12 is in an ON state, and the vehicle speed is
First set speed V1 (Vh) ≦ vehicle speed ≦ second set speed V2
And the speed change amount is
Speed change ≥ Set speed change A1
And the intake pipe negative pressure is
Intake pipe negative pressure ≤ set negative pressure P1
It is determined whether or not.
[0018]
As shown in FIG. 3, the first set speed V1 is, for example, 5 km / h, Vh is a hysteresis, for example, 3 km / h, and the second set speed V2 is, for example, 20 km / h. . In addition, the vehicle speed that requires the braking force of the brace at the time of deceleration is about 20 km / h in normal running and up to the vehicle speed just before the stop (about 2 km / h). In other words, even if the operation of the air conditioner is prohibited at a high vehicle speed, the effect is not obtained so much. In addition, by using hysteresis, the control according to this embodiment is not activated and the operation of the air conditioner is not prohibited during a traffic jam (0 to 4 km / h).
[0019]
The speed change amount is obtained by subtracting the vehicle speed 200 ms before the current vehicle speed, and the set speed change amount A1 is expressed as an absolute value. When A1 = −2 km / h, the change amount is 2 km / h. Become.
[0020]
The set negative pressure P1 is a differential pressure between the atmospheric pressure and the intake pipe internal pressure. For example, when the atmospheric pressure is 100 kPa and the intake pipe internal pressure is 67 kPa, the set negative pressure P1 is 33 kPa. The predetermined time T1 during which the operation of the air conditioner is prohibited is For example, 1000 ms.
[0021]
Further, the vehicular air conditioner control device 2 is more than the first set speed V1 (Vh) when the speed of the vehicle changes from the upper side to the lower side through the first set speed V1 (Vh). It has a function of prohibiting the operation of the air conditioner until the lower third set speed V3 (for hysteresis).
[0022]
Furthermore, the vehicle air conditioner control device 2 has a function of not inhibiting the operation of the air conditioner when the speed before deceleration of the vehicle is lower than the first set speed V1 (Vh).
[0023]
Further, the vehicle air conditioner control device 2 prohibits the operation of the air conditioner for the predetermined time T1, and then the vehicle is in a decelerating state where the brake is operated, and the vehicle is in the first set speed and the second set speed. The condition that the speed is within the speed range, the speed change amount is not less than the set speed change amount, and the intake pipe negative pressure is not more than the predetermined set negative pressure required for the operation of the brake booster mechanism is not satisfied. It also has a function to continue prohibiting the operation of the air conditioner until it becomes.
[0024]
That is, after the condition of the vehicle air conditioner control device 2 is satisfied, the operation of the air conditioner is prohibited for a predetermined time T1, and after the predetermined time T1 has elapsed, the condition of the vehicle air conditioner control device 2 is satisfied. Control is performed so as to continue prohibiting the operation of the air conditioner until the condition is not satisfied.
[0025]
The time T2 prohibits the operation of the air conditioner for a predetermined time T1 after the condition of the vehicle air conditioner control device 2 is satisfied. After the predetermined time T1 has elapsed, the condition is not satisfied, and the vehicle air conditioner control device. The allowable time until the condition 2 is satisfied again is represented, for example, 1000 ms.
[0026]
Next, the operation will be described along the flowchart for the air conditioner prohibition control of the vehicle air conditioner control device 2 of FIG.
[0027]
When the air-conditioner prohibition control program is started (102), it is determined (104) whether or not the condition is satisfied according to the driving state of the vehicle. That is, the vehicle is decelerated when the brake is applied, that is, the brake switch 12 is in the ON state, and the vehicle speed is
First set speed V1 (Vh) ≦ vehicle speed ≦ second set speed V2
And the speed change amount is
Speed change ≥ Set speed change A1
And the intake pipe negative pressure is
Intake pipe negative pressure ≤ set negative pressure P1
It is determined whether or not.
[0028]
If the determination (104) is NO, the determination is repeated until the determination (104) is YES. If the determination (104) is YES, has the time T2 elapsed since the end of the previous air conditioner prohibition? It shifts to judgment (106) of no.
[0029]
If this determination (106) is NO, that is, if the time T2 has not elapsed since the end of the previous air conditioner prohibition, the process returns to the determination (104) of whether or not the condition is satisfied, and the determination (106) is YES The process proceeds to a process (108) in which the air conditioner ON operation is not permitted only during the time T1, and the process proceeds to a determination (110) as to whether or not the time T1 has elapsed.
[0030]
In the determination (110) of whether or not the time T1 has elapsed, if the determination (110) is NO, the process returns to the process (108) that does not permit the ON operation of the air conditioner only for the time T1, and the determination (110) is performed. In the case of YES, it is determined (112) whether or not the above-mentioned condition is satisfied again.
[0031]
If the determination (112) of whether or not this condition is satisfied again is NO, the process returns to the determination (104) of whether or not the condition is satisfied and determination (112) of whether or not the condition is satisfied again. ) Is YES, the process proceeds to a process (114) in which the ON operation of the air conditioner is not permitted, and the process returns to the determination (112) as to whether or not the condition is satisfied again.
[0032]
That is, after the condition of the vehicle air conditioner control device 2 is satisfied, the operation of the air conditioner is prohibited for a predetermined time T1, and after the predetermined time T1 has elapsed, the condition of the vehicle air conditioner control device 2 is satisfied. Control is performed to continue prohibiting the operation of the air conditioner until the condition is not satisfied.
[0033]
For this reason, the vehicle is in a decelerating state where the brake is operated, and the vehicle is in the speed range of the first set speed V1 (Vh) and the second set speed V2 higher than the first set speed V1 (Vh), and When the condition that the speed change amount is not less than the set speed change amount A1 and the intake pipe negative pressure is not more than a predetermined set negative pressure P1 necessary for the operation of the brake booster mechanism is satisfied, the operation of the air conditioner is performed. The air conditioner is activated only when the braking force is insufficient due to the speed change amount and the intake pipe negative pressure in the speed range where the boosting effect of the brake booster mechanism due to the prohibition of the operation of the air conditioner is prohibited by prohibiting only the predetermined time T1. The frequency of prohibiting the operation of the air conditioner can be reduced, and the comfort in the passenger compartment can be improved.
[0034]
In addition, the vehicle air conditioner control device 2 has a speed higher than the first set speed V1 (Vh) when the vehicle speed changes from the upper side to the lower side after passing through the first set speed V1 (Vh). By having the function of prohibiting the operation of the air conditioner until the lower third set speed V3 (hysteresis), the boosting effect of the brake booster mechanism is maintained until just before the vehicle stops, ensuring the braking force and the brake pedal operation fee. The ring can be improved, which is practically advantageous.
[0035]
Further, the vehicle air conditioner control device 2 has a function of not inhibiting the operation of the air conditioner when the speed before deceleration of the vehicle is lower than the first set speed V1 (Vh), for example, 5 km / h. Under conditions that do not require a large braking force, such as when decelerating from traffic jams, vibrations can be reduced by reducing the frequency of prohibiting air conditioner operation, and the air conditioning effect in the passenger compartment can be improved. is there.
[0036]
Furthermore, the vehicle air conditioner control device 2 prohibits the operation of the air conditioner for the predetermined time T1, and then the vehicle is in a decelerating state where the brake is operated, and the vehicle is in the first set speed and the second speed. Conditions that are within the speed range of the set speed, the speed change amount is not less than the set speed change amount, and the intake pipe negative pressure is not more than the predetermined set negative pressure required for the operation of the brake booster mechanism are not satisfied. The function of continuing the prohibition of the operation of the air conditioner until the time becomes, so that the prohibition of the operation of the air conditioner is continued until the condition for prohibiting the operation of the air conditioner is not satisfied even after the operation of the air conditioner is prohibited for the predetermined time T1. Therefore, the operation and non-operation of the air conditioner can be prevented from being repeated, thereby contributing to the reduction of vibration.
[0037]
FIG. 5 shows a second embodiment of the present invention. In the second embodiment, portions that perform the same functions as those of the first embodiment will be described with the same reference numerals.
[0038]
In the first embodiment described above, the brake switch 12 is connected to the engine controller 4 of the vehicle air conditioner control device 2, but the feature of the second embodiment is that instead of the brake switch 12. In addition, the pedal force sensor or the switch 22 is connected and provided.
[0039]
That is, a pedal force sensor or switch 22 is attached to a brake pedal (not shown).
[0040]
Then, it becomes easy to determine whether the driver needs to decelerate by the brake or not, and the operation of the air conditioner can be prohibited only when deceleration is really necessary, which is practically advantageous.
[0041]
6 to 8 show a third embodiment of the present invention.
[0042]
A feature of the third embodiment is that an air conditioner compressor switch or a sensor 32 is connected to the engine controller 4 of the vehicle air conditioner control device 2.
[0043]
Then, the magnitude of the air conditioner load can be determined by the compressor pressure, the compressor pressure of the air conditioner is detected by the air conditioner compressor switch or the sensor 32, the time T1 which is the prohibition time of the air conditioner operation is changed, and the load of the air conditioner is large. When the intake pipe negative pressure is small, the time T1 is set long to increase the intake pipe negative pressure, and when the load on the air conditioner is small, the time T1 is set short so as not to prohibit the operation of the air conditioner unnecessarily. can do.
[0044]
FIG. 7 shows a relationship diagram when using an air conditioner compressor switch, and FIG. 8 shows a relationship diagram when using an air conditioner compressor sensor.
[0045]
9 to 10 show a fourth embodiment of the present invention.
[0046]
The fourth embodiment is a modification of the above-described third embodiment, and the feature of the fourth embodiment is that the air conditioner compressor pressure is not detected (pressure sensor and switch are not used). .
[0047]
That is, the magnitude of the air conditioner load can be determined by detecting the intake pipe negative pressure immediately before prohibiting the operation of the air conditioner during brake operation during deceleration, and the intake pipe negative pressure decreases when the air conditioner load is large. Conversely, when the load of the air conditioner is small, the intake pipe negative pressure becomes large.
[0048]
For this reason, the intake pipe negative pressure immediately before prohibiting the operation of the air conditioner during braking operation during deceleration is detected, the air conditioner operation prohibition time T1 is changed by this intake pipe negative pressure, the load on the air conditioner is large, and the intake pipe When the negative pressure is small, set the time T1 longer, earn the intake pipe negative pressure, and when the load of the air conditioner is small, set the time T1 short so as not to prohibit the operation of the air conditioner unnecessarily. Can do.
[0049]
FIG. 10 shows the relationship between the magnitude of the intake pipe negative pressure and the length of the time T1.
[0050]
The present invention is not limited to the first to fourth embodiments described above, and various application modifications can be made.
[0051]
For example, in the first embodiment of the present invention, the condition for prohibiting the operation of the air conditioner for a predetermined time is configured to take into account the deceleration state, the speed range of the vehicle, the speed change amount, and the intake pipe negative pressure. It is possible to adopt a special configuration that takes into account the temperature of the room, cooling water, and the like.
[0052]
In this case, the operation of the air conditioner is prohibited for a predetermined time depending on conditions such as the temperature of the outside air, the passenger compartment, and the cooling water, and the passenger compartment can be maintained at a substantially constant temperature, thereby improving the comfort of the passenger compartment. It can improve.
[0053]
In addition, a special configuration including an item for determining the weight of the driver in the condition may be adopted.
[0054]
In other words, when the driver's weight is large, it can be determined that the driver is a man or a large woman, and when the driver is heavy, the driver is compared with a small woman who is light in weight. Therefore, it can be estimated that the force to depress the brake pedal is strong.
[0055]
For this reason, when the weight of the driver is large, it is possible to give priority to the operation of the air conditioner by reducing the intake pipe negative pressure of the brake booster mechanism as much as possible.
[0056]
Furthermore, in order to enable the driver to determine the control state of the brake booster mechanism and air conditioner in the order of importance as required, it is possible to adopt a special configuration with signal input means that can be input to the engine controller and air conditioner controller. It is.
[0057]
In other words, when the driver's decision signal is input from the signal input means to the engine controller or the air conditioner controller, the control state of the brake booster mechanism, the air conditioner, etc. according to the driver's request can be ensured. The versatility becomes large and the setting according to the individual driver becomes possible, which is practically advantageous.
[0058]
【The invention's effect】
As described above in detail, according to the present invention, only when the braking force is insufficient due to the speed change amount and the intake pipe negative pressure within a speed range in which the boosting effect of the brake booster mechanism due to the prohibition of the operation of the air conditioner is large. Thus, the operation of the air conditioner can be prohibited, the frequency of the air conditioner operation prohibition can be reduced, and the comfort in the passenger compartment can be improved.
[Brief description of the drawings]
FIG. 1 is a flowchart for air conditioner prohibition control of a vehicle air conditioner control apparatus according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a vehicle air conditioner control device.
FIG. 3 is a vehicle speed condition establishment diagram.
FIG. 4 is a time chart for air conditioner prohibition control of the vehicle air conditioner control device;
FIG. 5 is a block diagram of a vehicle air conditioner control apparatus showing a second embodiment of the present invention.
FIG. 6 is a block diagram of a vehicle air conditioner control apparatus showing a third embodiment of the present invention.
FIG. 7 is a diagram showing a relationship between compressor pressure and time in the case of a sensor.
FIG. 8 is a diagram showing the relationship between compressor pressure and time in the case of a switch.
FIG. 9 is a block diagram of a vehicle air conditioner control apparatus showing a fourth embodiment of the present invention.
FIG. 10 is a diagram showing the relationship between intake pipe negative pressure and time.
[Explanation of symbols]
2 Vehicle air conditioner control device 4 Engine controller (also referred to as “ECM”)
6 Vehicle speed sensor 8 Intake pressure sensor 10 Atmospheric pressure sensor 12 Brake switch (also described as “BRK SW”)
14 Air conditioner controller

Claims (1)

In a vehicle air conditioner control device including an air conditioner driven by an internal combustion engine and a brake booster mechanism that reduces a brake pedal force using intake pipe negative pressure of the internal combustion engine, a speed before deceleration of the vehicle is the first speed. When the speed is lower than the first set speed, control is performed so as not to prohibit the operation of the air conditioner, the vehicle is in a decelerated state where the brake is operated, and the second set speed is higher than the first set speed and the first set speed. When the condition that the speed change amount is equal to or greater than the set speed change amount and the intake pipe negative pressure is equal to or less than a predetermined set negative pressure required for the operation of the brake booster mechanism is satisfied. the operation of the air conditioner prohibits predetermined time, after prohibiting the operation of the predetermined time air conditioning is in the deceleration state in which the vehicle is operated to brake, the a and the vehicle is the first set speed the Conditions that are within the speed range of the set speed, the speed change amount is not less than the set speed change amount, and the intake pipe negative pressure is not more than the predetermined set negative pressure required for the operation of the brake booster mechanism are not satisfied. If the vehicle speed changes from the upper side to the lower side after passing through the first set speed, the air conditioner operation prohibition is continued until the third set speed is lower than the first set speed. A vehicle air conditioner control device for controlling the intake pipe negative pressure so as to secure the intake pipe negative pressure acting on the brake booster mechanism by prohibiting the operation of the air conditioner.

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