JP2013203120A - Drive control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device for a vehicle, the device achieving both of a function of an air conditioner and a function of a brake booster.SOLUTION: A drive control device 1 includes a speed sensor 11, communication pipe 12, brake booster 13, pressure sensor 14, brake switch 15, idle switch 16, operation switch 21, compressor switch 22 and booster control device 17. The booster control device 17 turns off the compressor switch 22, when the operation switch 21 is turned on and the booster control device detects a traveling state through the speed sensor 11 and detects that at least one of the idle switch 16 and the brake switch 15 is turned on and that a pressure value p of the pressure sensor 14 is equal to or larger than a predetermined threshold. In the above control, the booster control device 17 varies the threshold in accordance with a vehicle speed v detected through the speed sensor 11.

Description

  The present invention relates to a driving control device that secures an assisting force for a brake pedal force during braking in a vehicle including a brake booster.

  There are vehicles equipped with a brake booster that assists the depressing force of the brake pedal. In the engine, a throttle valve provided in the middle of the air supply pipe is closed during operation, whereby the inside of the air supply pipe in the section from the throttle valve to the cylinder is decompressed. The brake booster uses a differential pressure between the atmospheric pressure and the pressure inside the air supply pipe downstream of the throttle valve to generate an auxiliary force so as to reduce the depressing force of the brake pedal.

  The throttle valve is linked to the accelerator pedal and also linked to the idling operation control. The engine of a vehicle is an idling engine in order to maintain the output for driving auxiliary equipment such as an alternator (generator) for supplying electric power to mounted electronic devices and an air conditioner for cooling. It is necessary to increase the output. That is, the opening degree of the throttle valve is increased. As a result, the differential pressure required for the auxiliary force cannot be obtained sufficiently particularly in a vehicle with a small displacement. A vehicle having a large auxiliary load is considered to be an air conditioner (air conditioner), and it is known to control the air conditioner and a brake booster in cooperation with each other.

  According to the technique described in Patent Document 1, a pressure switch is provided in a pipe line that communicates an air supply pipe and a brake booster. When the differential pressure detected by the pressure switch with respect to the preset atmospheric pressure (1 atm) is less than or equal to a predetermined value, it is predetermined that the throttle valve is fully closed when the accelerator switch (idle switch) is turned on. Turn off the air conditioner for hours. In addition, when the brake pedal is stepped on at a traveling speed, the air conditioner is stopped. Thereafter, the air conditioner is stopped until a predetermined time elapses after the vehicle stops. While the air conditioner is stopped, a differential pressure is secured to obtain the auxiliary force required for the next braking.

  According to the technique described in Patent Document 2, the vehicle speed sensor and the intake pressure sensor are provided. In Patent Document 2, it is a precondition that the vehicle is in a decelerating state in which a brake is operated, and further, the vehicle speed is within a certain speed range, and the speed change amount is a set value or more, When the pressure in the intake pipe does not have a sufficient differential pressure to operate the brake booster with respect to the atmospheric pressure, the operation of the air conditioner is prohibited for a predetermined time.

  According to the technique described in Patent Document 3, a hydraulic pressure sensor, a treading force sensor, and a stroke sensor are provided as means for detecting the operating force of the brake device, and the wheel speed sensor for detecting the rotational speed of the wheel or the vehicle deceleration is provided. When the vehicle deceleration detected by the G sensor to be detected is smaller than a preset threshold, the driving of the compressor of the air conditioner is stopped.

JP 2003-104046 A JP 2003-276416 A JP 2012-035724 A

  However, according to the technique described in Patent Document 1, for a certain period of time after releasing the accelerator pedal, a certain period of time after the brake pedal is depressed while the brake pedal is depressed while the traveling speed is present. In both cases, the air conditioner is stopped. That is, the air conditioner is frequently stopped depending on conditions.

  Further, according to the technique described in Patent Document 2, the air conditioner is stopped in order to secure auxiliary force when conditions such as the vehicle speed are met when the brake is operated, that is, when the brake is depressed. In other words, it is unclear whether the auxiliary power is insufficient until the brakes are depressed. Further, in the case of the technique described in Patent Document 2, the condition of the traveling speed range when the air conditioner is stopped is 2 to 20 km / h, which is a relatively low speed traveling. Therefore, when traveling in a city with many traffic lights, the air conditioner is frequently stopped depending on conditions.

  In either case, the air conditioner is stopped to secure the assisting force of the brake booster, so that it is expected that the user who is on board feels uncomfortable.

  Further, according to the technique described in Patent Document 3, although a pressure sensor for detecting intake pressure is not used, a hydraulic pressure sensor, a pedaling force sensor, a stroke sensor, and a G sensor are separately required. Since all of the hydraulic pressure sensor, the treading force sensor, the stroke sensor, and the G sensor are sensors that detect the size, a high level of calibration is required, and respective maintenance is required.

  Therefore, the present invention provides a vehicle operation control device that achieves both the functions of an air conditioner and a brake booster.

  An operation control device according to an embodiment of the present invention includes a speed sensor, a communication pipe, a brake booster, a pressure sensor, a brake switch, an idle switch, an operation switch, a compressor switch, and a booster control device. . The speed sensor detects the moving speed of the vehicle. The communication pipe is branched from the downstream side of the throttle valve of the intake pipe of the vehicle engine. The brake booster is connected to the communication pipe and assists the depression force of the brake pedal. The pressure sensor detects the pressure inside the area communicated with the communication pipe. The brake switch detects that the brake pedal has been depressed. The idle switch detects that the accelerator pedal for adjusting the opening degree of the throttle valve is not depressed. The operation switch operates an air conditioner that adjusts the air in the passenger compartment of the vehicle. The compressor switch operates the compressor of the air conditioner. The booster control device is connected to a speed sensor, a pressure sensor, a brake switch, an idle switch, an operation switch, and a compressor switch. The booster control device detects that the operation switch is on and the traveling state is detected by the speed sensor, detects that at least one of the idle switch and the brake switch is on, and the pressure value of the pressure sensor is a predetermined threshold value. When the above is detected, the compressor switch is turned off. At this time, the booster control device changes the threshold according to the vehicle speed detected by the speed sensor.

  At this time, in order to make the stop time of the compressor as short as possible, the booster control device cancels turning off the compressor switch after a certain time has elapsed after turning off the compressor switch. That is, the compressor switch returns to the state before it was turned off by the booster controller.

  In addition, even when the brake switch is not functioning, in order to ensure the assisting force of the brake booster, the booster control device is a pressure sensor in a state where the brake switch has never been turned on after the engine is started. When it is detected that the pressure value is equal to or greater than a predetermined threshold value, the compressor switch is turned off.

  The booster control device sets the first threshold value as a threshold value when the output of the speed sensor is a first speed value that is equal to or higher than the set speed, and the output of the speed sensor is equal to or lower than the set speed. A second threshold value is set as a threshold value at the time of the second speed value. The first threshold value at this time is a value lower than the second threshold value.

  The operation control device further includes an atmospheric pressure sensor that detects an atmospheric pressure at a point where the vehicle is located. The first threshold value and the second threshold value are set so that the differential pressure from the atmospheric pressure sensor becomes a predetermined value.

  According to the operation control device of the present invention, the booster control device changes the pressure threshold of the region communicated with the communication pipe that temporarily stops the compressor of the air conditioner according to the traveling speed of the vehicle.

  The downstream area of the intake pipe from the throttle valve is depressurized from the atmospheric pressure by closing the throttle valve. That is, the operation control apparatus according to the present invention can obtain a differential pressure necessary for the auxiliary force generated by the brake booster with respect to the atmospheric pressure as the reference pressure, in order to obtain a braking force according to the traveling speed of the vehicle. If not, the air conditioner compressor is stopped.

  According to the invention of the operation control device that cancels turning off the compressor switch when a certain time has elapsed after the booster control device turns off the compressor switch, while sufficiently ensuring the differential pressure required for the brake booster, The time during which the compressor switch is off can be limited to a short time.

  Operation that turns off the compressor switch when the booster control device detects that the brake switch has never been turned on after the engine is started, and the pressure value of the pressure sensor is above a predetermined threshold value According to the invention of the control device, priority is given to securing the auxiliary force of the brake booster. Even if the brake switch stops functioning, the auxiliary power of the brake booster is always guaranteed.

  The first threshold value is set when the output of the speed sensor is equal to or higher than the set speed, and the second threshold value is set when the output of the speed sensor is equal to or lower than the set speed. In accordance with the invention of the operation control device in which the first threshold value is lower than the second threshold value, the auxiliary force of the brake booster can be ensured as the vehicle speed increases, and the vehicle speed The slower the compressor is, the shorter the time during which the compressor switch is off can be limited.

  An operation control device comprising an atmospheric pressure sensor for detecting an atmospheric pressure at a point where a vehicle is located, wherein the first threshold value and the second threshold value are set so that a differential pressure between the atmospheric pressure sensor and the atmospheric pressure sensor becomes a predetermined value, respectively. According to the present invention, even when the atmospheric pressure decreases, for example, when traveling in high mountains or entering low pressure, it is possible to ensure the differential pressure necessary to obtain the auxiliary force of the brake booster. . Therefore, the brake booster operates correctly.

The block diagram which shows the system configuration | structure of the operation control apparatus of one Embodiment of this invention. The flowchart of the braking control in the driving | running control apparatus shown in FIG.

  An operation control apparatus 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The block diagram of FIG. 1 shows a configuration to which the operation control device 1 is related. The operation control device 1 includes a speed sensor 11, a communication pipe 12, a brake booster 13, a pressure sensor 14, a brake switch 15, an idle switch 16, an operation switch 21 for an air conditioner 20, a compressor switch 22, And a booster control device 17.

  The speed sensor 11 is a sensor that detects the moving speed of the vehicle, and may also be used as a speedometer of the vehicle. The communication pipe 12 is branched from a point downstream of the throttle valve 31 installed in the middle of the intake pipe 3 of the vehicle engine 2, and is connected to the brake booster 13. The brake booster 13 assists the depression force of the brake pedal 5.

  The brake booster 13 has a first chamber 131 and a second chamber 132 that are partitioned by a diaphragm 130. The first chamber 131 is communicated with the intake pipe 3 by the communication pipe 12. When the throttle valve 31 is closed while the vehicle is traveling, the first chamber 131 and the second chamber 132 are depressurized lower than the atmospheric pressure. The second chamber 132 communicates with the outside and becomes atmospheric pressure when the brake pedal 5 is depressed. As a result, the differential pressure between the first chamber 131 and the second chamber 132 applied to the diaphragm 130 acts as an auxiliary force that reduces the pedaling force of stepping on the brake pedal 5, and the brake 51 can be operated with a small force.

  The pressure sensor 14 detects the pressure inside the area communicated with the communication pipe 12, that is, the area up to the intake pipe 3 and the brake booster 13 downstream of the throttle valve 31 in this embodiment. The communication pipe 12 is provided with a check valve 121 for maintaining the pressure in the first chamber 131 of the brake booster 13 that has been decompressed. The pressure sensor 14 is installed between the check valve 121 and the brake booster 13.

  The brake switch 15 is installed at a position where the operation of the brake pedal 5 can be detected, detects that the brake pedal 5 has been depressed, and is turned on. The idle switch 16 is installed at a position where the operation of the accelerator pedal 6 for adjusting the opening of the throttle valve 31 can be detected, and detects that the accelerator pedal 6 is released, that is, the accelerator pedal 6 is not depressed. Turn on.

  The operation switch 21 of the air conditioner 20 is installed in the passenger compartment of the vehicle, and is turned on and off as appropriate by the user who is in the vehicle. The air conditioner 20 has cooling, heating, and ventilation functions for adjusting the air in the passenger compartment. The compressor switch 22 turns on and off the compressor that circulates the refrigerant in the heat exchanger of the air conditioner 20 in order to perform heat exchange by adiabatic compression and adiabatic expansion. The compressor switch 22 is appropriately turned on and off by the control device of the air conditioner 20 so that the temperature set in the air conditioner 20 is reached. The air conditioner 20 further includes a fan 23 that blows air cooled or heated by the heat exchanger into the vehicle interior. The fan 23 operates by turning on the operation switch 21.

  The booster control device 17 is connected to the speed sensor 11, the pressure sensor 14, the brake switch 15, the idle switch 16, the operation switch 21, and the compressor switch 22, respectively. When the booster control device 17 detects that at least one of the idle switch 16 and the brake switch 15 is on in a state where the operation switch 21 is on and the speed sensor 11 outputs a value other than zero. When the information acquired by the speed sensor 11 and the pressure sensor 14 satisfies the following conditions, the compressor switch 22 is turned off to reduce the load on the auxiliary machine and suppress the opening of the throttle valve 31 from increasing. .

  The first condition is that when the output of the speed sensor 11 is the first speed value V1 that is equal to or higher than the set speed v, the pressure value p of the pressure sensor 14 is related to the magnitude of the first speed value V1. This is a case where it is detected that the value is equal to or greater than the first threshold value P1. The second condition is that when the output of the speed sensor 11 is the second speed value V2 that is equal to or less than the set speed v, the pressure value p of the pressure sensor 14 is related to the magnitude of the second speed value V2. This is a case where it is detected that the value is equal to or greater than the second threshold value P2.

The operation of the operation control device 1 configured as described above will be described with reference to FIG.
When the operation switch 21 of the air conditioner 20 is turned on shortly after starting the engine 2 of the vehicle or during traveling (S1), the operation control device 1 then stops the speed v detected by the speed sensor 11 from stopping. It is determined whether it is other than the speed to be determined, for example, other than zero (S2). When the speed v is zero, the vehicle is not moving, that is, the brake 51 is already operated and the vehicle is stopped, so the booster control device 17 does not perform control to turn off the compressor switch 22. If the speed v is other than zero, it is determined that the vehicle is traveling. It is determined whether at least one of the brake switch 15 or the idle switch 16 is turned on (S3). When the brake switch 15 is turned on, that is, the brake pedal 5 is depressed, or the idle switch 16 is turned on, that is, the accelerator pedal 6 is not depressed, the brake 51 is operated. Or it means that the brake 51 may be operated.

  When the brake switch 15 or the idle switch 16 is on in the determination of S3, the operation control apparatus 1 of the present embodiment has a vehicle speed that is higher than the set speed Vc for the speed v detected by the speed sensor 11. (S4). The speed Vc set in this embodiment is about 30 km / h. When the speed v is the first speed value V1 higher than the set speed Vc, the booster control device 17 obtains a differential pressure necessary for operating the brake booster 13 when the speed v is the first speed value V1. As a pressure value p for this purpose, a first threshold value P1 that is a pressure value associated with the magnitude of the first speed value V1 is set (S5).

  The pressure value p detected by the pressure sensor 14 is compared with the first threshold value P1 (S6). When the pressure value p is higher than the first threshold value P1, that is, the differential pressure for operating the brake booster 13 is increased. If it is insufficient, the booster controller 17 turns off the compressor switch 22 in preference to the control of the air conditioner 20 (S7). The booster control device 17 maintains the state for a while after stopping the compressor even if the conditions of S2 to S4 are not satisfied in order to recover the sufficient differential pressure in the brake booster 13 (S8). The holding time t may be a predetermined time Tc1, or a time obtained from the difference between the pressure value p measured by the pressure sensor 14 at that time and the first threshold value P1 and the first speed value V1. It may be T1.

  When the speed v measured by the speed sensor 11 is the second speed value V2 that is slower than the set speed Vc, the booster controller 17 operates the brake booster 13 when the speed value V2 is the second speed value V2. As a pressure value p for obtaining a differential pressure required for the second, a second threshold value P2 which is a pressure value associated with the magnitude of the second speed value V2 is set (S9). Then, the pressure value p detected by the pressure sensor 14 is compared with the second threshold value P2 (S10), and when the pressure value p is higher than the second threshold value P2, that is, the difference for operating the brake booster 13. When the pressure is insufficient, the booster control device 17 turns off the compressor switch 22 in preference to the control of the air conditioner 20 (S11). In order to restore a sufficient differential pressure to the brake booster 13, the booster control device 17 maintains the state for a while after stopping the compressor even if the conditions of S2 to S4 are not satisfied (S12). The holding time t may be a predetermined time Tc2, or is obtained from the difference between the pressure value p measured by the pressure sensor 14 at that time and the second threshold value P2, and the second speed value V2. It may be time T2.

  The first threshold value P1 and the second threshold value P2 are read from data prepared in advance in a part of the storage unit of the booster control device 17. When the traveling speed of the vehicle is high, a larger braking force is required to decelerate, so the first threshold value <the second threshold value is set. Each of the first threshold value P1 and the second threshold value P2 may include a data table. In this case, each data table is a two-dimensional map in which the pressure value p measured by the pressure sensor 14, the first speed value V1, and the second speed value V2 are variables.

  Regardless of whether the traveling speed of the vehicle is the first speed value V1 or the second speed value V2, the compressor switch 22 is turned off when the holding time t for turning off the compressor switch 22 has elapsed. Release (S13). In the case of this embodiment, the holding time t is about 1.5 to 2.0 seconds. When the control device of the air conditioner 20 requires the operation of the compressor at the time of release, the compressor is immediately operated. When the operation of the compressor is not required at the time of S13, the compressor remains stopped.

  At this time, the holding time t once is sufficiently shorter than the time for the control device of the air conditioner 20 to stop the compressor due to temperature setting or the like. Moreover, the time when the compressor is stopped by the booster control device 17 in preference to the control device of the air conditioner 20 is limited to the case where the conditions of S2 to S4 and S6 or S10 are satisfied. The temperature of the heat exchanger of the air conditioner 20 does not change abruptly during the holding time t. In any case, if the operation switch 21 is on, the fan 23 of the air conditioner 20 continues to operate.

  Therefore, even when the compressor switch is turned off by the booster control device 17 and the compressor is stopped, the air conditioning device 20 functions in the same manner as the operation state of the control device of the air conditioning device 20. The booster control device 17 operates when the differential pressure necessary to operate the brake booster 13 is insufficient, thereby reliably providing the assisting force for the pedal force for operating the brake pedal 5. Thus, the operation control device of the present invention can achieve both the function of the air conditioner 20 and the function of the brake booster 13.

  After canceling turning off the compressor switch 22 (S13), it is confirmed whether the vehicle is stopped (S14), and if not, the process returns to S1 for confirming whether the operation switch 21 is on. In S14, it is confirmed whether the vehicle is stopped. If the vehicle is stopped, it is further confirmed whether the operation switch 21 is turned off (S15). When the operation switch 21 is off, this series of control flow ends. If the operation switch is not turned off, the flow returns to the flow of confirming that the speed v is not zero (S2), that is, confirming whether the vehicle is traveling.

  In the present embodiment, when it is confirmed whether at least one of the brake switch 15 and the idle switch 16 is on (S3), neither of them, that is, the brake pedal 5 is not depressed and the accelerator pedal is not depressed. When 6 is stepped on, the brake 51 is not immediately activated. In this case, the flow proceeds to a flow for confirming whether the vehicle is stopped, that is, whether the speed v is zero (S14).

  At this time, the booster control device 17 of the operation control device 1 of this embodiment is once from when the brake pedal 5 starts the engine 2 when neither the brake switch 15 nor the idle switch 16 is turned on in S3. Is confirmed, that is, the history of the output signal of the brake switch 15 is confirmed (S16). The booster control device 17 has a storage medium that records when the brake pedal 5 is depressed even once after the engine 2 is started. This storage medium is reset to the initial state when the engine 2 is stopped.

  It is assumed that the brake pedal 5 is stepped on at least once in a general driving operation from start to start of the engine. Therefore, if neither the brake switch 15 nor the idle switch 16 is turned on in S3, it can be confirmed whether or not the brake switch 15 has failed by checking the history of stepping on the brake pedal 5 in S16. Specifically, after the engine 2 is started, it is confirmed whether the brake switch 15 is turned on before the speed sensor 11 outputs a value other than zero.

  If the signal of the brake switch 15 is recorded, it is confirmed that the brake switch 15 is operating normally and that the brake pedal 5 has not been depressed in S3. When the signal of the brake switch 15 is not recorded, that is, when there is no history of stepping on the brake pedal 5 even after the engine 2 is started, it is suspected that the brake switch 15 is damaged. In this case, since it is not possible to detect that the brake switch 15 is turned on in S3, it is necessary to prepare to obtain the assisting force by the brake booster 13 at any time.

  Therefore, if there is no history of stepping on the brake pedal 5 in S16, the process returns to the flow when at least one of the brake switch 15 and the idle switch 16 is on in S3, and proceeds to S4. Then, when the output of the speed sensor 11 is the first speed value V1, the process proceeds to S6, and when it is detected that the pressure value p of the pressure sensor 14 is equal to or higher than the first threshold value, or the output of the speed sensor 11 is the second value. When the speed value V2 is S2, the process proceeds to S10, and when it is detected that the pressure value p of the pressure sensor 14 is equal to or greater than the second threshold value, the process proceeds to S7 and S11, respectively, and the compressor switch 22 is turned off.

  By configuring the booster control device 17 in this way, the operation control device 1 can operate the compressor switch while the air conditioner 20 is functioning even when the output signal of the brake switch 15 cannot be obtained unexpectedly. 22 can be turned off and the brake booster 13 can function.

  The brake switch 15 is turned on when the brake pedal 5 is not depressed and is turned off when the brake pedal 5 is depressed, and the brake switch 15 is turned on when the brake pedal 5 is not depressed. And a second line that conducts when the brake pedal 5 is cut off and is depressed. By configuring the brake switch 15 in this way, it is possible to know that the brake switch 15 is functioning normally by monitoring the first line, and to monitor the second line. Thus, it can be detected that the brake switch 15 is turned on, that is, that the brake pedal 5 is depressed. Similarly, as the idle switch 16, a switch that switches a line that can be detected when the accelerator pedal 6 is depressed or not may be employed.

  The operation control apparatus 1 may further include a pressure sensor 18 that measures the atmospheric pressure at a point where the vehicle is located, and may be controlled by a differential pressure from the pressure inside the communication pipe 12 measured by the pressure sensor 14. That is, the first threshold value P1 is set so that the differential pressure between the atmospheric pressure and the first threshold value P1 is constant, and the second threshold value is set so that the differential pressure between the atmospheric pressure and the second threshold value is constant. Is set. Since there is a relationship of “first threshold <second threshold”, the differential pressure between the atmospheric pressure and the first threshold is larger. In that case, even when the atmospheric pressure fluctuates, such as when traveling in a high mountain area or entering a low atmospheric pressure, a differential pressure necessary to obtain the assisting force of the brake booster can be ensured. Therefore, the brake booster operates correctly.

  The pressure sensor 14 may be a differential pressure sensor that measures an internal pressure in a region to which the communication pipe 12 is connected, that is, a differential pressure between an internal pressure of the brake booster 13 and an atmospheric pressure at a point where the vehicle is located. By adopting the differential pressure sensor, the pressure sensors 14 and 18 can be replaced with one sensor. In this case, since the absolute value of the pressure inside the communication pipe 12 cannot be detected, the first threshold value and the second threshold value are replaced with the differential pressure threshold value. Therefore, the booster control device 17 turns off the compressor switch 22 when it becomes smaller than the first threshold value P1 and the second threshold value P2, respectively.

  DESCRIPTION OF SYMBOLS 1 ... Operation control apparatus, 2 ... Engine, 3 ... Intake pipe, 5 ... Brake pedal, 6 ... Accelerator pedal, 11 ... Speed sensor, 12 ... Communication pipe, 13 ... Brake booster, 14 ... Pressure sensor, 15 ... Brake switch, DESCRIPTION OF SYMBOLS 16 ... Idle switch, 17 ... Booster control apparatus, 20 ... Air-conditioning equipment, 21 ... Operation switch, 22 ... Compressor switch, 31 ... Throttle valve

Claims (5)

A speed sensor for detecting the moving speed of the vehicle;
A communication pipe branched from the downstream of the throttle valve of the intake pipe of the vehicle engine;
A brake booster connected to the communication pipe to assist the pedaling force of the brake pedal;
A pressure sensor for detecting the pressure inside the area communicated with the communication pipe;
A brake switch for detecting that the brake pedal has been depressed;
An idle switch for detecting that an accelerator pedal for adjusting the opening of the throttle valve is released;
An operation switch of an air conditioner for adjusting the air in the passenger compartment of the vehicle;
A compressor switch for operating a compressor of the air conditioning device;
A booster control device connected to each of the speed sensor, the pressure sensor, the brake switch, the idle switch, the operation switch, and the compressor switch;
The booster control device includes:
While the operation switch is on and the running state is detected by the speed sensor, it is detected that at least one of the idle switch and the brake switch is on, and the pressure value of the pressure sensor is greater than or equal to a predetermined threshold value. An operation control device that turns off the compressor switch when it is detected and changes the threshold according to the vehicle speed detected by the speed sensor. 2. The operation control device according to claim 1, wherein the booster control device releases turning off the compressor switch when a predetermined time elapses after the compressor switch is turned off. The booster control device is in a state where the brake switch has not been turned on once after the engine is started.
When it is detected that the pressure value of the pressure sensor is equal to or greater than the predetermined threshold value,
The operation control device according to claim 1, wherein the compressor switch is turned off. The booster control device includes:
When the output of the speed sensor is a first speed value equal to or higher than a set speed, a first threshold is set as the threshold,
When the output of the speed sensor is a second speed value equal to or lower than a set speed, a second threshold is set as the threshold;
The operation control device according to any one of claims 1 to 3, wherein the first threshold value is set to a value lower than the second threshold value. An atmospheric pressure sensor for detecting an atmospheric pressure at a point where the vehicle is located;
The operation control device according to claim 4, wherein the first threshold value and the second threshold value are set such that a differential pressure between the first threshold value and the atmospheric pressure sensor becomes a predetermined value.

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