JP2006327537A - Abs actuator inspecting method and abs actuator inspecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable both a requisite functional inspection and a leakage inspection to be finished through one inspection against an assembled product of ABS actuator. <P>SOLUTION: At first, a predetermined air pressure is applied into the ABS actuator 1 from an air source 21 through pieces of piping 20, 22 connected to a master cylinder connection port 10 and then both functional inspection and leakage inspection for a holding valve 2, pressure reducing valve 4 and reservoir 3 are carried out. Next, three opening and closing valves 23-25 in the pieces of the piping 20, 22 are closed and an an atmospheric air releasing valve 28 is opened to release a part in the piping to the atmosphere. Then, the pressure reducing valve 4 is closed and the atmospheric air releasing valve 28 is closed and at the same time an opening and closing valves 24, 25 are opened to release a part of the air pressure within a pipe passage connecting a discharging side of a pump 5 with the pressure reducing valve 4, and further a predetermined pressure difference is generated between a suction side and a discharging side of the pump 5. Then, in this state, both valve opening pressure and leakage of a check valve are inspected, and the pump 5 is operated to inspect a pump performance in reference to an increased pressure on the discharging side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for quality inspection of an actuator (ABS actuator) of an antilock brake system (ABS) installed in a brake system of a vehicle.

  As indicated by reference numeral 1 in FIG. 3, the ABS actuator includes a pair of holding valves 2 and 2 for controlling the supply and discharge of brake fluid from the master cylinder M / C to the wheel cylinder W / C, and the wheel cylinder W / C. A pair of pressure-reducing valves 4 and 4 for escaping the brake fluid to the reservoir (piston type) 3, a pump 5 for pumping the brake fluid in the reservoir 3 and returning it to the master cylinder M / C, and a suction side and a discharge side of the pump 5 The structure is provided with two check valves 6 and 7 that are arranged and restrict the backflow of the brake fluid to the reservoir 3. In such an ABS actuator, in response to a command from a controller (not shown), the holding valve 2 is controlled to the closed position and the pressure reducing valve 4 is controlled to the open position, as shown in the figure. The brake fluid is released to the reservoir 3 to prevent the wheels from being locked.

  The ABS control is a two-line control with each pair of left and right front wheels and left and right rear wheels, two-line control with each pair of left front wheel and right rear wheel, right front wheel and left rear wheel, or left front wheel and left rear wheel. In general, two-system control with the right front wheel and the right rear wheel as a pair is shown, but only one ABS actuator is shown in FIG. 3 for convenience of explanation. ABS actuators include a holding valve and a pressure reducing valve integrated as a three-position solenoid valve (Patent Document 1), or an actuator shared with traction control (Patent Document 2). Is the same as that shown in FIG.

By the way, quality inspection of this type of ABS actuator 1 is performed using air pressure in a dry state after assembly. The contents of the quality inspection include a function inspection and a leakage inspection. In order to perform a function inspection (performance inspection) of the pump 5, the pressure on the suction side (upstream side of the check valve 6) of the pump 5 is pumped. 5 is required to be higher than the pressure on the discharge side (downstream of the check valve 7). Therefore, conventionally, as shown in FIG. 4, before the ABS actuator 1 is completed, a masking jig 8 is assembled to the assembly portion of the reservoir 3, and the air source 9 passes through the masking jig 8 and enters the ABS actuator 1. Air pressure was applied. In this case, the master cylinder connection port 10 of the ABS actuator 1 is closed by the on-off valve 12 in the pipe 11 connected to the port 10, and the wheel cylinder connection port 13 is sealed with an appropriate plug member (not shown). By closing each pressure reducing valve 4, the air pressure corresponding to the reduced opening pressure of the check valves 6, 7 from the air source 9 acts on the downstream side of the check valve 7 on the discharge side of the pump 5. Thus, a pressure difference is generated between the suction side and the discharge side. Therefore, if the pump 5 is operated in this state, the pressure on the secondary side of the check valve 7 on the discharge side increases, and the pressure increase is attached to, for example, the pipe 11 connected to the master cylinder connection port 10. By detecting with the pressure sensor 14, the performance test of the pump 5 can be performed.
Japanese Patent Laid-Open No. 5-112234 JP-A-8-108842

  However, according to the conventional ABS actuator inspection method described above, after the differential pressure is generated in the ABS actuator to inspect the pump performance, the reservoir 3 is assembled in place of the masking jig 8 to complete the ABS actuator. In the state of the finished product, the air pressure is applied to the ABS actuator 1 from the master cylinder connection port 10 side, and the finished product including the reservoir 3 and the leakage inspection must be performed twice. Since the inspection is performed separately, there is a problem that the cost and time burden required for the inspection are large.

  The present invention has been made in view of the above-described technical background, and the object of the present invention is to make it possible to complete necessary functional inspection and leakage inspection in one inspection for a finished product, and thus to perform inspection. An object of the present invention is to provide an ABS actuator inspection method and inspection apparatus that greatly contributes to a reduction in cost and a reduction in inspection time.

  In order to solve the above problems, an ABS actuator inspection method according to the present invention includes a holding valve that controls supply and discharge of brake fluid from a master cylinder to a wheel cylinder, a pressure reducing valve that releases brake fluid from the wheel cylinder to a reservoir, and the reservoir A pump for pumping up the brake fluid in the pump and returning it to the master cylinder and an ABS actuator inspection method provided with two check valves disposed on the suction side and the discharge side of the pump and restricting the backflow of the brake fluid to the reservoir A first step of applying a predetermined air pressure in the ABS actuator through the master cylinder connection port, and performing a function test and a leak test of the holding valve, the pressure reducing valve and the reservoir, and with the pressure reducing valve closed, A part of the air pressure in the pipe line connecting the discharge side of the pump and the pressure reducing valve is released to the outside, and the suction of the pump A second step of generating a predetermined pressure difference between the discharge side and the discharge side, performing a leak check of the check valve in a state where the pressure difference is generated, and operating the pump to prevent a pressure increase on the discharge side A third step of checking the pump performance is included.

  In the ABS actuator inspection method performed as described above, the ABS actuator can be applied to the ABS actuator even when the reservoir is assembled by applying air pressure to the ABS actuator through the master cylinder connection port and reducing the pressure in the ABS actuator. A predetermined pressure difference can be generated between the suction side and the discharge side of the internal pump, and a necessary function test and a leak test including a pump performance test can be performed at a time.

  The ABS actuator inspection apparatus according to the present invention includes an air source connected to a master cylinder connection port of an ABS actuator, two on-off valves arranged at predetermined intervals in the middle of the piping, An air release valve disposed in the middle of an air release pipe connected to a portion between the two on-off valves, and the ABS actuator is disposed in a pipe surrounded by the two on-off valves and the air release valve. It is characterized by a pressure adjustment region in which a part of the internal air pressure is released.

  In the ABS actuator inspection apparatus configured as described above, the valves in the pipe are made to cooperate with the valves in the ABS actuator, so that the air pressure in the ABS actuator is set in the pressure adjustment region set in the pipe. A predetermined pressure difference can be easily generated in the ABS actuator by letting out the part.

  According to the inspection apparatus and inspection method for an ABS actuator according to the present invention, a necessary function inspection and leakage inspection can be performed with a single inspection on a finished product, so that inspection costs can be greatly reduced and inspection time can be greatly increased. Can be achieved.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows an ABS actuator inspection apparatus and inspection method according to the present invention. Since the ABS actuator 1 to be inspected is the same as that shown in FIG. 3, the same parts are denoted by the same reference numerals here. The inspection apparatus includes an air source 21 connected to the master cylinder connection port 10 of the ABS actuator 1 via a main pipe 20. The air source 21 is commonly used for inspection of another one-line ABS actuator (not shown), and the sub-pipe 22 branched from the middle of the main pipe 20 is connected to another one-line ABS actuator (not shown). Has been extended. In the main pipe 20, a first on-off valve 23 and a second on-off valve 24 are arranged at a predetermined interval with a branch portion of the sub-pipe 22 interposed therebetween. An on-off valve 25 is arranged. Further, an air release pipe 27 having a silencer 26 at the tip is connected to the middle of the sub-pipe 22, and an air release valve (open / close valve) 28 is disposed in the air release pipe 27. Pressure sensors 29 and 30 are attached to the main pipe 20 and the sub pipe 22, respectively.

  Hereinafter, an inspection method using the inspection apparatus configured as described above will be described with reference to the time chart of FIG. In FIG. 1, a black valve represents a closed state.

  When inspecting the ABS actuator 1, first, as shown in FIG. 1A, the air release valve 28 is closed, and the first, second, and third on-off valves 23, 24, and 25 are all opened. Compressed air is sent from the air source 21 to the two ABS actuators 1, and a predetermined air pressure is applied to each ABS actuator 1. At this time, a predetermined air pressure is applied to the entire area of the ABS actuator 1 including the reservoir 3 by opening both the holding valve 2 and the pressure reducing valve 4 in the ABS actuator 1 as illustrated. Therefore, the function and leakage can be inspected by detecting the stroke of the reservoir 3 at this time. Although the description is omitted in the time chart of FIG. 2, for example, the leakage of the holding valve 2 is caused by applying the air pressure in the state where the holding valve 2 and the pressure reducing valve 4 are first closed. The holding valve 2 is opened and the pressure on the wheel cylinder connection port 13 side is detected to detect the flow characteristics of the holding valve 2 and the leakage of the pressure reducing valve 4, and the pressure reducing valve 4 is opened from this state. Each of the four flow characteristics can be inspected.

  Next, as shown in FIG. 1B, the three on-off valves 23 to 24 in the inspection apparatus are closed, and then the atmosphere release valve 28 is opened. As a result, a region surrounded by the first and second on-off valves 23 and 24 in the main pipe 20 and the third on-off valve 25 and the air release valve 28 in the sub-pipe 22 (hereinafter, this region is adjusted). Pressure area) is released to the atmosphere.

  Next, as shown in FIG. 1 (c), the pressure reducing valve 4 in the ABS actuator 1 is closed, and then the second opening / closing valve 24 in the main pipe 20 and the third opening / closing in the sub pipe 22. The valve 24 is opened. Then, the compressed air in the pipe line connecting the discharge side of the pump 5 in the ABS actuator 1 and the pressure reducing valve 4 escapes into the pressure regulating region, and as a result, the suction side pipe of the pump 5 blocked by the pressure reducing valve 4. A pressure difference is generated between the passage and the discharge side pipe of the pump 5. This pressure difference has a magnitude corresponding to the volume of the pressure adjusting region, that is, the escape amount of compressed air to the pressure adjusting region. The valve opening pressure and leakage of the check valves 6 and 7 can be inspected from changes in pressure values detected by the pressure sensors 29 and 30 provided in the main pipe 20 and the sub pipe 22. The pressure change ΔPV shown in FIG. 3 represents the leakage of the check valves 6 and 7 described above.

  Thereafter, as shown in FIG. 1 (d), the second on-off valve 24 and the third on-off valve 25 in the inspection apparatus are closed, and the holding valve 2 in the ABS actuator 1 is closed. Then, the pump 5 is operated. Then, the pressure on the discharge side of the pump 5 rises, and the performance of the pump 5 can be inspected from changes in pressure values detected by the pressure sensors 29 and 30 provided in the main pipe 20 and the sub pipe 22. The pressure change ΔPP shown in FIG. 3 represents the performance of the pump 5 described above.

  As described above, according to this inspection method, by operating the valves in the inspection device in an organic combination with the valves in the ABS actuator 1, air pressure is applied and reduced from the master cylinder connection port side, A pressure difference can be effectively generated in the ABS actuator 1, and as a result, necessary function tests and leak tests including the pump 4 can be performed at a time.

1 shows the structure and inspection procedure of an ABS actuator inspection apparatus according to an embodiment of the present invention in relation to an ABS actuator, wherein (a) shows various valves when a test pressure is applied to the ABS actuator. (B) is a circuit diagram showing the operating state of each valve when the air pressure is released from the piping in the inspection apparatus, and (c) is a pressure difference by reducing the pressure inside the ABS actuator. FIG. 4D is a circuit diagram showing the operating state of each valve when inspecting the pump performance in the ABS actuator. It is a time chart which shows the test | inspection pattern by this test | inspection apparatus. It is a circuit diagram which shows the structure of the conventional general ABS actuator. It is a circuit diagram which shows the implementation condition of the inspection method of the conventional ABS actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ABS actuator 2 Holding valve 3 Reservoir 4 Pressure reducing valve 5 Pump 6,7 Check valve 20 Main piping 21 Air source 22 Sub piping 23, 24, 25 On-off valve 27 Atmospheric release pipe 28 Atmospheric release valve

Claims (2)

  A holding valve that controls supply and discharge of brake fluid from the master cylinder to the wheel cylinder, a pressure reducing valve that releases brake fluid from the wheel cylinder to the reservoir, a pump that pumps up the brake fluid in the reservoir and returns it to the master cylinder, and a suction side of the pump A method for inspecting an ABS actuator, which is arranged on the discharge side and includes two check valves for restricting the backflow of brake fluid to the reservoir, wherein a predetermined air pressure is applied to the ABS actuator through a master cylinder connection port. A first step of performing a function test and a leak test of the holding valve, the pressure reducing valve and the reservoir, and with the pressure reducing valve closed, the air pressure in a pipe line connecting the discharge side of the pump and the pressure reducing valve A second step in which a part is released to the outside and a predetermined pressure difference is generated between the suction side and the discharge side of the pump; Performs leak inspection of the check valve in the state, by operating the pump, the inspection method of the ABS actuator, characterized in that it comprises a third step of examining pump performance from the pressure rise of the discharge side. An air source connected to the master cylinder connection port of the ABS actuator, two on-off valves arranged at predetermined intervals in the middle of the pipe, and air connected to a portion of the pipe between the two on-off valves A pressure adjusting region for releasing a part of the air pressure in the ABS actuator through a pipe surrounded by the two on-off valves and the air release valve, and an air release valve arranged in the middle of the open pipe; An inspection apparatus for an ABS actuator, characterized in that

Images