JP2002200977A - Auxiliary hydraulic pressure source device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and securely perform the zero point correction of a hydraulic pressure monitor means for monitoring the hydraulic pressure of an accumulator in an auxiliary hydraulic pressure source device. SOLUTION: This auxiliary hydraulic pressure source device for a vehicle is provided with a reservoir RS for storing a fluid, a hydraulic pump HP for raising the pressure of the fluid inside the reservoir to a predetermined pressure to discharge it, the accumulator AC for storing a discharged hydraulic pressure, and a pressure sensor P1 for continuously detecting the stored hydraulic pressure to monitor it. The hydraulic pump is driven in response to the result of the detection by the sensor P1 to control the accumulator hydraulic pressure within a preset range. A changeover valve (a solenoid valve V1) interposed between the accumulator and the reservoir in a fluid passage for returning the fluid discharged from the hydraulic pump to the reservoir is controlled, and in a state that a vehicle stops, the hydraulic pump HP is stopped and the solenoid valve V1 is opened to discharge brake liquid inside the accumulator, and the zero point correction of the hydraulic sensor P1 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary hydraulic pressure source device for a vehicle, and more particularly to a hydraulic pump for increasing the pressure of a fluid in a reservoir to a predetermined pressure and discharging the same, and an accumulator for accumulating the discharged hydraulic pressure. The present invention relates to an auxiliary hydraulic pressure source device suitable for a hydraulic brake device of a vehicle.

[0002]

2. Description of the Related Art Various types of auxiliary hydraulic pressure source devices for vehicles are known. For example, in addition to a master cylinder which is a hydraulic pressure generating device for outputting a brake hydraulic pressure in response to a brake operation, a hydraulic pressure generating device is provided. Auxiliary hydraulic pressure source devices equipped with a pressure pump and an accumulator have become widespread. For example, Japanese Unexamined Patent Publication
JP-A-136365 relates to the prior art and discloses that "during operation (of the auxiliary hydraulic pressure supply device),
Vary with bar. The hydraulic pump switches on as soon as the auxiliary pressure drops to the lower limit and operates until the auxiliary pressure reaches the upper limit. " In this publication, the output of the auxiliary hydraulic pressure supply device is controlled by a single pressure switch and a relay so that the motor can be driven even when a contact of a relay for turning on and off the drive motor of the pump fails and an alarm can be issued. It has been proposed that a certain accumulator pressure be maintained within a predetermined range, and when the accumulator pressure falls below a lower limit, an alarm be issued by another pressure switch and the motor be driven by another relay.

[0003] Also, Japanese Patent No. 2582003 discloses that
In a pressure source for a pressure device, a pressure switch that detects the pressure of an accumulator as a pressure detecting means and outputs an ON / OFF signal of a pump, and a pressure switch of the accumulator for detecting whether the pressure switch is normal or faulty. As a conventional technology, a device equipped with a pressure sensor that outputs a pressure signal corresponding to the pressure sensor is used to accurately determine whether the pressure detecting means is normal or faulty, and to operate the pump even if the pressure detecting means fails. 2. Description of the Related Art A pressure source for a pressure device intended for proper control has been proposed. In this publication, the pressure detecting means has a pressure sensor and a pressure switch, and determines whether the pressure sensor is normal or faulty. When it is determined that the pressure sensor is normal, the operation of the pump is performed based on the pressure signal of the pressure sensor. The pressure signal is compared with the on / off signal of the pressure switch.If the two signals do not match, it is determined that the pressure switch has failed. It has been proposed to control the operation of the pump on the basis of this.

[0004]

All of the devices described in the above publications have means for detecting the hydraulic pressure of the accumulator. Japanese Patent No. 2582003 discloses that the pressure detection means is normal or malfunctioning. It is also described that it is determined whether or not it is. However, no reference is made to zero point correction in the pressure detecting means for detecting the hydraulic pressure of the accumulator.

As a general configuration of the accumulator described in the above publication, for example, a configuration is known in which a piston is slidably housed in a cylinder and nitrogen gas is sealed between the two. It is configured to maintain the state where the chamber is compressed and the pressure is raised to a predetermined pressure range. After the start of driving of the hydraulic pump, fluid (for example, brake fluid) always exists in the cylinder, and the pressure fluctuates. With respect to such an accumulator, the pressure of the accumulator can be continuously monitored by a pressure sensor, and if a desired fluid pressure can always be secured, only the necessary fluid amount is stored in the accumulator. Therefore, miniaturization becomes possible. However, pressure is constantly generated in the accumulator after the start of driving of the hydraulic pump, and it is not possible to perform an appropriate correction process on the zero point in the pressure detecting means for detecting the accumulator hydraulic pressure described in the above publication. In addition, the accumulator liquid amount at the start of driving the hydraulic pump varies. That is, when the zero point in the pressure detecting means is higher than the true value, the fluid amount in the accumulator at the start of driving the hydraulic pump is the true value (required fluid amount).
If the zero point is lower than the true value, the fluid amount in the accumulator at the start of the hydraulic pump drive will be greater than the true value (required fluid amount).

Accordingly, the present invention is to provide an auxiliary hydraulic pressure source device having a hydraulic pump and an accumulator so that the zero point correction of a hydraulic pressure monitoring means for monitoring the hydraulic pressure of an accumulator can be performed easily and reliably. As an issue.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a reservoir mounted on a vehicle for storing a fluid, and the fluid in the reservoir being maintained at a predetermined pressure. A hydraulic pump for boosting and discharging, an accumulator for accumulating the discharge hydraulic pressure of the hydraulic pump, a hydraulic pressure monitoring means for continuously detecting and monitoring the hydraulic pressure of the accumulator,
Control means for driving the hydraulic pump in accordance with the detection result of the hydraulic pressure monitoring means to control the hydraulic pressure of the accumulator within a predetermined range. A flow path for returning a discharge fluid of the hydraulic pump to the reservoir, an on-off valve interposed between the accumulator and the reservoir in the flow path to open and close the flow path under the control of the control unit; Stop determination means for determining the stop state of the, the control means,
When the stop determination means determines that the vehicle is in a stopped state, the hydraulic pump is stopped and the on-off valve is opened to discharge the fluid in the accumulator, and the hydraulic pressure monitoring means It is configured to perform zero point correction. It is desirable that the zero point correction process be performed at least once after the engine of the vehicle is started.

The auxiliary hydraulic pressure source device further includes a vehicle speed detecting means for detecting a speed of the vehicle, and a stop holding means for holding the vehicle in a stopped state. The stop determination means may be configured such that, after the engine of the vehicle is started, when the vehicle speed detected by the vehicle speed detection means is zero and the stop holding means holds the vehicle in a stopped state. It may be configured to determine that the vehicle is in a stopped state.

In particular, as set forth in claim 3, it is provided with operation detecting means for detecting an operation state of the driver with respect to the vehicle, and the control means is arranged such that the operation detecting means detects the driver's operation state with respect to the vehicle. It is preferable that when the operation is detected, the zero point correction of the hydraulic pressure monitoring means is prohibited. Therefore, in this case, the hydraulic pump can be driven with the on-off valve being in the closed position, and the operation can be immediately shifted to the operation according to the driver's operation. When the auxiliary hydraulic pressure source device is applied to, for example, a hydraulic brake device, as the operation detecting means, besides a brake switch that opens and closes in response to a brake pedal operation, a pressure sensor that detects a master cylinder hydraulic pressure is used. Can be used. Then, when the driver operates the brake pedal, the zero point correction is prohibited, so that it is possible to immediately shift to the desired braking control.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example of a configuration in which an auxiliary hydraulic pressure source device according to an embodiment of the present invention is applied to a hydraulic brake device of a vehicle, and a master piston MP is driven forward in response to an operation of a brake pedal BP to form a reservoir RS. A master cylinder MC that boosts the brake fluid to output the brake fluid pressure to the wheel cylinder WC, an auxiliary fluid pressure source AS that boosts the brake fluid in the reservoir RS to a predetermined pressure and outputs the power fluid pressure, Pressure regulating means RG connected to the pressure source AS and to the reservoir RS to regulate the output power hydraulic pressure of the auxiliary hydraulic pressure source AS to a predetermined pressure, and to drive the master piston MP by the output hydraulic pressure after the pressure adjustment. Is provided. Incidentally, the pressure adjusting means RG may be any of means called a regulator, a hydraulic assist device, a hydraulic booster, a hydraulic servo and the like.

A normally closed solenoid valve V1 for controlling the opening and closing of a supply-side hydraulic passage connecting the pressure adjusting means RG to the auxiliary hydraulic pressure source AS, and a discharge side connecting the pressure adjusting means RG to the reservoir RS. A normally-open solenoid valve V2 for controlling the opening and closing of the hydraulic passage is provided, and by controlling these solenoid valves V1 and V2, the output hydraulic pressure of the pressure adjusting means RG is controlled. Auxiliary hydraulic pressure source AS
Has a hydraulic pump HP driven by the electric motor M, has an input side connected to the reservoir RS, and an output side connected to the accumulator AC via a check valve CV and connected to the solenoid valve V1. I have. In particular, the solenoid valve V
1 and V2 are controlled independently of the operation of the brake pedal BP, and the automatic brake control can be performed by adjusting the master cylinder hydraulic pressure supplied to the wheel cylinder WC. still,
Although the solenoid valves V1 and V2 of the present embodiment are constituted by linear solenoid valves as shown in FIG. 1, they may be constituted by ordinary on-off valves.

The auxiliary hydraulic pressure source device of this embodiment includes a reservoir RS for storing a fluid (brake fluid) shown in FIG. 1 and a reservoir RS for forming the above-mentioned auxiliary hydraulic pressure source AS. A hydraulic pump HP for increasing the brake fluid pressure to a predetermined pressure and discharging the same, and an accumulator AC for accumulating the discharge hydraulic pressure of the hydraulic pump HP, and further continuously detecting the hydraulic pressure accumulated in the accumulator AC. A pressure sensor P1 as a hydraulic pressure monitoring means for monitoring the pressure, and a hydraulic pump HP is driven in accordance with the detection result of the pressure sensor P1 to accumulator A
Control means for controlling the hydraulic pressure of C within a predetermined range is provided. In this embodiment, the control means is an electronic control unit CT.
The electronic control unit CT is configured as shown in FIG. Then, a flow path (supply-side hydraulic pressure path and discharge-side hydraulic pressure path) for returning the discharge fluid of the hydraulic pump HP to the reservoir RS via the accumulator AC is interposed between the accumulator AC and the reservoir RS. Solenoid valve V
1 constitutes the on-off valve of the present invention.

Further, in the present embodiment, as shown in FIG. 1, a wheel speed sensor WS for detecting a wheel speed, a brake switch BS for turning on / off in response to an operation of a brake pedal BP, and holding the vehicle in a stopped state. And a pressure sensor P2 for detecting a master cylinder hydraulic pressure.
These output signals are supplied to the electronic control unit CT.
In an automatic vehicle, a means for detecting that the shift position is in the parking range can be used instead of the parking brake switch PK. Further, the operation state of the brake pedal BP can be detected based on the output hydraulic pressure of the pressure sensor P2 instead of the brake switch BS.

In the electronic control unit CT, when the vehicle is in a stopped state, the hydraulic pump HP is stopped and the solenoid valve V1 is opened to discharge the brake fluid in the accumulator AC, and the accumulator fluid is discharged. Pressure is 0
In this state, the zero point correction of the pressure sensor P1 is performed, which will be described later with reference to FIGS. The stop determining means for determining whether or not the vehicle is in a stopped state includes a stop holding means (for example, the above-described parking brake switch) when the vehicle speed is zero after the engine of the vehicle is started, as described later. When PK) holds the vehicle in a stopped state, it can be determined that the vehicle is in a stopped state.

The electronic control unit CT is configured as shown in FIG. 2, for example, and includes a CPU connected to each other via a bus,
Microcomputer CM comprising ROM, RAM, input interface IT and output interface OT
It has. Although not shown, the microcomputer CM also has a built-in EEPROM, and is configured such that the memory is retained even after the ignition switch IG is turned off. In the present embodiment, a correction storage value Aox described later is stored in the EEPROM. The output signals of the pressure sensors P1 and P2, the wheel speed sensor WS, the ignition switch IG, the brake switch BS, and the parking brake switch PK are supplied to an amplifier circuit A, respectively.
It is configured to be input to the CPU from the input interface IT via I. Further, the solenoid valves V1 and V2 are output from the output interface OT through the drive circuit AO.
And the drive current of the electric motor M is supplied. In microcomputer CM, RO
M stores a predetermined program, the CPU executes the program while the ignition switch IG is closed, and the RAM temporarily stores variable data necessary for executing the program.

In the hydraulic brake system configured as described above, the electronic control unit CT controls the solenoid valves V1 and V2.
A series of processes for driving the hydraulic pump HP are performed. That is, when the ignition switch IG is closed, the microcomputer CM starts executing a predetermined program.
The point correction process will be described with reference to the flowcharts of FIGS.

First, when the ignition switch IG is closed (turned on), the microcomputer CM is initialized in step 101 of FIG. 3, various calculation values are cleared, and each flag is reset (0). Next, the routine proceeds to step 102, where output signals of the pressure sensor P1, the wheel speed sensor WS, the brake switch BS, the parking brake switch PK, and the like are read, and input processing is performed. Subsequently, in step 103, the estimated vehicle speed Vs is calculated based on the wheel speed detected by the wheel speed sensor WS. Therefore, the vehicle speed detecting means of the present invention is configured here. Next, in step 104, EEPRO
It is determined whether or not M has been corrected and stored (the processing of step 116 described later), that is, whether or not the zero-point correction processing has been performed in the past. If the correction has been stored, the routine proceeds to step 105, where the state of the correction completion flag Fm is determined.

The correction completion flag Fm is set when the zero point correction process is performed once after the ignition switch IG is turned on (step 116 described later). Therefore, immediately after the ignition switch IG is turned on, before the 0-point correction is updated,
If the correction completion flag Fm is not set (if it is 0), first, in step 106, the correction storage value Aox is set to the zero-point correction value Aoa. This correction storage value Aox is a zero-point correction value obtained in the previous processing, and is held in the EEPROM even when the ignition switch IG is turned off. On the other hand, if the correction completion flag Fm is set, the process proceeds to step 118 in FIG. 4 without performing the zero point correction. That is, in the present embodiment, the configuration is such that the zero point correction is performed only once after the ignition switch IG is turned on.

After the processing in step 106, and when it is determined in step 104 that there is no correction storage, the zero-point correction processing is performed as follows. First, at step 107, the stop state of the vehicle is determined. Specifically, when the estimated vehicle speed Vs is 0 and the parking brake switch PK is on, it is determined that the vehicle is stopped, and in step 108, the brake switch BS
Is determined. If the brake pedal BP is not operated and the brake switch BS is off, the state of the pressure sensor (here, the pressure sensor P1 for detecting the accumulator hydraulic pressure) is determined in step 109.
If it is determined that the pressure sensor P1 is normal, the process proceeds to step 110. If it is determined that the pressure sensor P1 is abnormal, the process proceeds to step 117 in FIG. 4 and the pressure sensor abnormality flag Fz is set (1).
Is done. On the other hand, when it is determined in steps 107 and 108 that the vehicle is not stopped, and when the brake switch BS is on, the process proceeds to step 118 in FIG. 4 without performing zero point correction.

In step 110, the hydraulic pump H
The pump drive prohibition flag Fp for prohibiting the drive of P is set (1), and the normally closed solenoid valve V1 is turned on to open the position (at this time, the solenoid valve V2 is maintained in the open position). ing). Then, the routine proceeds to step 111, where it is determined whether or not the first counter C1 has exceeded a predetermined time T1. The predetermined time T1 is set to, for example, a time (for example, 600 ms) required until the pressure in the accumulator AC becomes 0 after the solenoid valve V1 is turned on (for example, 600 ms), and the first counter C1 turns on the solenoid valve V1. Start when it is. Therefore, when the count value of the first counter C1 exceeds the predetermined time T1, the process proceeds to step 113 of FIG. 4 and if the first counter C1 is equal to or less than the predetermined time T1, the first counter C1 is determined at step 112. Is counted up (+1), the process returns to step 102, and the above processing is repeated.

Next, in step 113 of FIG.
It is determined whether the detection value S (n) of the pressure sensor P1 is within a predetermined allowable range. If the detection value S (n) is within the predetermined range, the process proceeds to step 114, where the previous average value Sa (n− 1) and the average value of the current detection value S (n) are calculated, and the value [(Sa (n−
1) + S (n)) / 2] is set as the current average value Sa (n). Then, the process proceeds to a step 115, wherein it is determined whether or not the second counter C2 has exceeded a predetermined time T2. The predetermined time T2 is set to an appropriate time (T2 <T1, for example, 400 ms) to be adopted as the average value Sa (n), and the second counter C2 determines that the first counter C1 has the predetermined time T1. It is started when the detected value S (n) exceeds the predetermined range. The count value of the second counter C2 is equal to a predetermined time T2.
If not, the second counter C2 is determined in step 124.
Is counted up, the process returns to step 102 and the above processing is repeated.

When the second counter C2 reaches the predetermined time T
When it exceeds 2, the routine proceeds to step 116, where the following processing is performed (the predetermined time T1 is set to be longer than the predetermined time T2). That is, the average value Sa (n) obtained in step 114 is used as the corrected stored value Aox, and the corrected stored value Aox is used as the current zero-point correction value Aoa. Here, the corrected storage value Aox is stored in the EEPROM even when the ignition switch IG is turned off, and becomes an initial value when the ignition switch IG is turned on next. On the other hand, the zero-point correction value Aoa is used only while the ignition switch IG is on. Furthermore,
In step 116, the correction storage process is performed, the correction storage value Aox is stored in the EEPROM, and the correction completion flag Fm is set (1). Further, a pump drive permission flag Fa (hereinafter, simply referred to as a permission flag Fa) is set, and the hydraulic pump HP can be driven. Then, the solenoid valve V1 is turned off and returned to the closed position.

On the other hand, if it is determined in step 113 that the detection value S (n) of the pressure sensor P1 is not within the predetermined range, the process proceeds to step 117, where the pressure sensor abnormality flag Fz is set (1). 118 and 119
Then, the process proceeds to step 120. In step 118, the first counter C1 and the second counter C2 are cleared (0), and in step 119, the permission flag F
is set (that is, the hydraulic pump HP can be driven), and the solenoid valve V1 is turned off and returned to the closed position.

After the processing in step 116, the process proceeds to step 120, where the state of the permission flag Fa is determined. If it is determined that the permission flag Fa is set, the process proceeds to step 121, where the state of the permission flag Fa is determined. If it is determined that the permission flag Fa is set, the routine proceeds to step 121, where the current pressure sensor P
A value obtained by subtracting the zero point correction value Aoa from the detection value S (n) of 1 is compared with a predetermined value Ks1. If the difference (S (n) -Aoa) is less than the predetermined value Ks1, the deviation from the point 0 is determined to be very small, and the routine proceeds to step 122, where the hydraulic pump HP is turned on (driven). On the other hand, if it is determined in step 121 that the difference (S (n) -Aoa) is equal to or larger than the predetermined value Ks1, the process further proceeds to step 123, and the difference (S (n) -Aoa)
Is compared with a predetermined value Ks2 (Ks2> Ks1). If it is determined in step 123 that the difference (S (n) -Aoa) is equal to or larger than the predetermined value Ks2, the flow proceeds to step 124, where the hydraulic pump HP is turned off, and the flow returns to step 102 in FIG. Step 123
If it is determined that the difference (S (n) -Aoa) is smaller than the predetermined value Ks2, it is determined in step 125 whether or not the hydraulic pump HP is in the ON state. The on state of the pump HP is maintained, but if not, the process returns to step 102 in FIG. As described above, the hysteresis is set in the on / off determination criterion of the hydraulic pump HP. If it is determined in step 120 that the permission flag Fa has not been set,
Proceeding to step 124, the hydraulic pump HP is turned off and returning to step 102 of FIG.

FIG. 5 shows an example of the first processing of the zero-point correction of the accumulator hydraulic pressure detecting pressure sensor P1 in the above embodiment, and the driving of the hydraulic pump HP is prohibited at t1 when the vehicle is stopped. When the solenoid valve V1 is turned on (open position), the accumulator A shown in FIG.
Since the brake fluid in C is returned to the reservoir RS via the solenoid valve V1 and the solenoid valve V2 (open position in the off state), the fluid pressure in the accumulator AC slightly decreases as shown in the second stage from the bottom in FIG. After a delay of 0, it drops sharply,
Becomes At this time, there is no correction storage, and the correction completion flag Fm is 0. Therefore, the 0-point correction value is 0, and the 0-point correction of the accumulator hydraulic pressure is not performed.

When the driving of the hydraulic pump HP is permitted at the time t2 when the vehicle is stopped and the solenoid valve V1 is turned off (closed position), as shown in the second stage from the bottom in FIG. The pressure increase in the accumulator AC starts. At this time, the processing is performed as described above, a predetermined zero-point correction value Aoa is set, and the correction completion flag Fm is set (1).

The above-described embodiment relates to an auxiliary hydraulic pressure source device provided for a hydraulic brake device of a vehicle. However, the auxiliary hydraulic pressure source device of the present invention is applicable to, for example, a hydraulic suspension device of a vehicle. Can be applied to the hydraulic pressure control device.

[0028]

Since the present invention is configured as described above, the following effects can be obtained. That is, according to the first aspect of the present invention, when the vehicle is in a stopped state, the hydraulic pump is stopped, the on-off valve is opened, and the fluid in the accumulator is discharged. Since the zero point correction is performed, even if the zero point of the accumulator hydraulic pressure at the start of the operation of the hydraulic pump is incorrect, the zero point correction is reliably performed in a state where the fluid in the accumulator is discharged. And the accumulator fluid pressure can be monitored with good detection accuracy. Therefore, only the necessary amount of fluid needs to be stored in the accumulator, so that the accumulator can be reduced in size.

In the auxiliary hydraulic pressure source device according to the present invention, when the vehicle speed is zero after the engine of the vehicle is started and the stop holding means holds the vehicle in a stopped state, the vehicle stops. Since the configuration is such that it is determined to be in the state, the zero point correction of the accumulator can be reliably performed, and the hydraulic pressure of the accumulator can be appropriately monitored.

In the auxiliary hydraulic pressure source device according to the third aspect, when the operation detecting means detects the operation of the driver on the vehicle, the zero point correction of the hydraulic pressure monitoring means is prohibited. Therefore, the operation can be immediately shifted to the operation according to the operation of the driver, and the zero point correction can be performed without impairing the normal control.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a hydraulic brake device for a vehicle including an auxiliary hydraulic pressure source device of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an electronic control device according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating zero point correction processing of an accumulator hydraulic pressure detection pressure sensor according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating zero point correction processing of an accumulator hydraulic pressure detection pressure sensor according to an embodiment of the present invention.

FIG. 5 is a time chart illustrating an example of a zero-point correction process of the accumulator hydraulic pressure detection pressure sensor according to the embodiment of the present invention.

[Explanation of symbols]

CT electronic control unit, RS reservoir, AS auxiliary hydraulic pressure source, AC accumulator, HP hydraulic pump,
M electric motor, CV check valve, V1, V2 solenoid valve, P1, P2 pressure sensor, IG ignition switch, PK parking brake switch, MC
Master cylinder, RG pressure regulator, BP brake pedal, WC wheel cylinder, WS Wheel speed sensor

Claims (3)

[Claims] 1. A reservoir mounted on a vehicle for storing a fluid, a hydraulic pump for increasing the pressure of the fluid in the reservoir to a predetermined pressure and discharging the same, and an accumulator for accumulating a discharge hydraulic pressure of the hydraulic pump. A hydraulic pressure monitoring means for continuously detecting and monitoring the hydraulic pressure of the accumulator, and controlling the hydraulic pressure of the accumulator within a predetermined range by driving the hydraulic pump according to the detection result of the hydraulic pressure monitoring means. An auxiliary hydraulic pressure source device for a vehicle having control means, wherein a flow path for returning the discharge fluid of the hydraulic pump to the reservoir via the accumulator is provided between the accumulator and the reservoir in the flow path. An on-off valve for opening and closing the flow path under the control of the control means, and stop determination means for determining a stop state of the vehicle, wherein the control means sets the stop state of the vehicle to a stop state. When it is determined that there is, the fluid pressure pump is stopped and the on-off valve is opened to discharge the fluid in the accumulator, and the zero point correction of the fluid pressure monitoring means is performed. Auxiliary hydraulic pressure source device for vehicles. 2. A vehicle speed detecting means for detecting a speed of the vehicle, and a stop holding means for holding the vehicle in a stopped state, wherein the stop determining means is configured to start the vehicle after starting the engine of the vehicle. When the speed of the vehicle detected by the speed detection means is zero and the stop holding means holds the vehicle in a stopped state, the vehicle is determined to be in a stopped state, The auxiliary hydraulic pressure source device for a vehicle according to claim 1. 3. An operation detection means for detecting a driver's operation state on the vehicle, wherein the control means is configured to control the hydraulic pressure monitoring means when the operation detection means detects a driver's operation on the vehicle. 2. The auxiliary hydraulic pressure source device for a vehicle according to claim 1, wherein said zero point correction is prohibited.