KR101960252B1 - Monitoring system for pressure control valve of estimate map automated build-out - Google Patents

Abstract

The present invention relates to a monitoring system to automatically build a pressure estimation map of a pressure control valve, which automatically measures the pressure of an ABS pneumatic control valve, braking responsibility, a wheel speed, and the like to build a pressure control valve control map. According to the present invention, an ABS pneumatic simulator monitoring system comprises: S1) a step of inputting and setting a start pressure and a target pressure of a pressure control valve (or a pneumatic control valve); S2) a step of transmitting set start and target pressure values to an ECU; S3) a step of allowing a controller to match the target pressure with the current pressure in accordance with an internal algorithm; S4) a step of allowing the controller to measure and store a PWM signal and a pressure sensor signal sent to the pressure control valve for pressure control; S5) a step of lowering the target pressure to repeat the steps S1 to S3 after storing the pressure values, wherein the start pressure is lowered to repeat the steps S1 to S4 when the target pressure becomes 1 bar; and S6) a step of being terminated to build a pressure control valve control map when the start pressure becomes 1 bar.

Description

TECHNICAL FIELD [0001] The present invention relates to a monitoring system for automatically establishing a pressure control valve,

More particularly, the present invention relates to a monitoring system for automatically building a pressure estimation map of an ABS pressure control valve, and more particularly, Enabling control valve control maps to be constructed and also to evaluate the control logic of the ABS brake system.

BACKGROUND ART Generally, a vehicle is equipped with a pneumatic brake for braking front and rear wheels, a booster for transmitting braking pressure to the pneumatic brake, and an air chamber. When the driver depresses the brake pedal, braking pressure is generated, And the braking force is generated. However, if the braking pressure is greater than the road surface condition while the driver steps on the brake pedal and the braking force is increased / maintained, or if the friction force on the pneumatic brake is greater than the braking force on the tire or the road surface, .

An anti-lock brake system for effectively preventing such slip phenomenon and obtaining a strong and stable braking force is provided with a plurality of pressure control valves (or air pressure control valves) for controlling the braking pressure transmitted to the pneumatic brake side, an accumulator and a pump Respectively.

The pressure regulating valve includes a normally open type air supply solenoid valve normally kept open and a normally closed type exhaust solenoid valve normally closed, and is precisely controlled by a control map mounted on the ECU.

Conventionally, a method of constructing the control map of the pressure regulating valve has been obtained by measuring the pressure of the pressure regulating valve and the braking responsive wheel speed by using a measuring instrument such as a multimeter or an oscilloscope, There are various problems such as poor accuracy of data due to individual differences.

Korean Patent Registration No. 10-0849083 (Name of the invention: Vehicle Monitoring Apparatus, Patent Publication of Jul. 30, 2008) Korean Patent Laid-Open Publication No. 10-2017-0094944 (entitled "Method and system for monitoring air pressure in a vehicle," filed on August 27, 2017) Korean Patent Laid-Open Publication No. 10-2011-0094060 (entitled " Element Monitoring and Supplementary Schedule of Vehicle, "

An object of the present invention is to provide an ABS pneumatic simulator monitoring system for automatically measuring data such as pressure, braking responsiveness and wheel speed of a pressure control valve constituted in an ABS brake system, and constructing a control map.

Another object of the present invention is to provide an ABS pneumatic simulator monitoring system capable of evaluating the control logic of an ABS pneumatic system.

The ABS pneumatic simulator monitoring system of the present invention comprises S1) inputting and setting a start pressure and a target pressure of a pressure control valve (or a pneumatic control valve); S2) transmitting a set start pressure value and a target pressure value to the ECU; S3) the controller matching the target pressure and the current pressure according to an internal algorithm; S4) measuring a PWM signal and a pressure sensor signal sent from the controller to the pressure control valve for pressure control and storing the measurement signal in the storage means; S5) When the storage is completed, lower the target pressure and repeat steps S1), S2), and S3), and repeat steps S1), S2), S3), and S4) by lowering the starting pressure when the target pressure is 1 bar. S6) establishing a pressure control valve control map when the start pressure is 1 bar; .

The ABS pneumatic simulator monitoring system of the present invention comprises: a) setting a starting pressure and a target pressure using input means of a monitoring equipment (PC); b) transmitting the set start pressure value and the target pressure value to the ECU via CAN communication; c) using the internal algorithm of the ECU to match the current pressure and the target pressure input from each sensor; d) storing the matched data in a storage device; e) repeating steps a), b), c) and d) until the target pressure reaches 1 bar while lowering the starting pressure; f) terminating if the target pressure reaches 1 bar and the starting pressure equals 1 bar; .

Each of the sensors includes at least one of a brake pedal pressure sensor, a chamber pressure sensor, a pressure sensor, a wheel speed sensor, an inlet solenoid voltage sensor, A voltage sensor, and an exhaust solenoid voltage sensor (Outlet_PCV Voltage Sensor).

The matched data includes the start pressure, the target pressure, the current pressure, the supply solenoid voltage, the exhaust solenoid voltage, the supply duty, the exhaust duty, and the supply / exhaust time.

The ABS pneumatic simulator monitoring system of the present invention includes a brake pedal pressure sensor, a chamber pressure sensor, a plurality of pressure sensors, a plurality of wheel speed sensors, an air supply solenoid voltage sensor, and an exhaust solenoid voltage sensor Being; An air supply means for supplying pressure air to the pressure regulating valve and an exhaust means for exhausting the pressure regulating valve are connected to the output portion of the ECU; A DAQ for CAN communication is connected to the ECU, a monitoring device (PC) constituted by a computer or the like is connected to the DAQ, and a control map of the pressure control valve is stored in the memory of the monitoring device (PC).

On the left side of the monitor screen of the monitoring equipment (PC), a measured value output graph section is provided in which the current pressure and the target pressure of the pressure regulating valve in the simulator are visually represented, and the measured values of various sensors are output (ON / OFF) of the brake, ON / OFF of the ABS, and ON / OFF status of the ASR are displayed at the lower end of the measured value output section. A data storage path display unit in which a storage path of data obtained from each of the sensors is displayed, and a storage button and a stop button in the right side of the data storage path display unit.

The present invention can automatically measure the pressure, braking responsiveness, and wheel speed of the ABS pneumatic control valve, evaluate the control logic of the ABS pneumatic system, and automatically construct a pressure control valve control map Is a very useful invention.

Fig. 1 is a flow chart of a process of establishing a pressure control valve control map as an example of the present invention.
2 is a system configuration diagram showing an example of the present invention.
3 is a flowchart showing an example of the present invention.
4 is a photograph of the pressure control valve and the solenoid shown in the embodiment of the present invention.
5 is a screen output view of a monitoring device (PC) shown in an example of the present invention.
6 is a control map data chart of the pressure control valve shown as one example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the embodiments of the present invention, the same components as in the drawings are denoted by the same reference numerals as possible, and detailed descriptions of known configurations and functions are omitted so as not to obscure the gist of the present invention. May be different from what is actually implemented with the schematized drawings in order to easily describe the embodiments of the present invention.

The present invention is in the construction of a pressure control map for precise control of the pressure control valve.

In the present ABS system, since the brake chamber pressure sensor is not present, the pressure of the present valve can not be known. Therefore, the brake chamber pressure is necessary for the ABS operation. Therefore, since a system capable of estimating the pressure of the valve is required, the pressure of the present valve can be estimated by using the supply time and the exhaust time of the solenoid valve constituted in the pressure control valve.

However, since the pressure depending on the supply time and the exhaust time varies depending on the shape and flow path of the pressure control valve, in order to construct a control map of the pressure control valve, in the present invention, The control map is constructed by obtaining the optimum data by repeating the test using the valve.

In the present invention, a pressure control valve control map is automatically constructed using hardware and software, a control map of the pressure control valve is inserted into the controller in the form of a source code, and the controller can estimate the current brake chamber pressure without a sensor .

FIG. 1 shows a process of constructing a control map of a pressure control valve (or a pneumatic control valve) using the ABS pneumatic simulator monitoring system of the present invention. As shown in Table 1 below, (S1) of inputting and setting a start pressure and a target pressure of the start pressure value and the target pressure of the control valve, transmitting the set start pressure value and the target pressure value to an ECU (Electronic Control Unit) (S4) of measuring a PWM signal and a pressure sensor signal sent from the controller to the pressure control valve for pressure control and storing the measured pressure signal in the storage means, When the target pressure is 1 bar, the target pressure is lowered and the target pressure is lowered. If the target pressure is 1 bar, the starting pressure is decreased to repeat the steps S1, S2, S3 and S4 (S5)Fee to be a step (S6) to complete the construction of the pressure regulating valve control map.

Starting pressure Target pressure Remarks


8 bar


7 bar 6 bar 5 bar 4 bar 3 bar 2 bar 1 bar 7 bar
6 bar 5 bar 6 bar
5 bar ... ... ... 2 bar 1 bar

2 is a system configuration diagram according to an embodiment of the present invention. In the input unit of an ECU (Electronic Control Unit), a brake pedal pressure sensor (Pedal Pres. Sensor) for sensing the pressure of the brake pedal, A chamber pressure sensor and a plurality of pressure sensors for detecting the brake chamber pressure of each wheel, a plurality of pressure sensors for detecting the wheel speed to detect the vehicle speed, An output solenoid voltage sensor (Inlet_PCV Voltage Sensor) for sensing a voltage applied to the coil of the air supply solenoid, an exhaust solenoid voltage sensor (Outlet_PCV) for sensing a voltage applied to the coil of the exhaust solenoid, Voltage Sensor) are respectively connected.

An output unit of the ECU is connected to an air supply unit that supplies pressure air to the pressure regulating valve and an exhaust unit that exhausts the air by opening the pressure regulating valve.

A DAQ for CAN communication is connected to the ECU, a monitoring device (PC) such as a computer is connected to the DAQ, and a control map of the pressure control valve acquired and built in the storage device of the monitoring device (PC) is stored.

The starting pressure and the target pressure of the pressure regulating valve can be set using the monitoring equipment PC, and the result is displayed on the screen as shown in FIG. 5. The constructed control map is stored in the memory device Memory, etc.).

In the present invention, when the start pressure and the target pressure of the pressure control valve are set through an input means such as a mouse, a keyboard, a touch screen, and the like of a monitoring device (PC) , Various kinds of data are displayed on the monitor screen of the monitoring equipment (PC) and monitored, and after being collected as shown in FIG. 6, a control map capable of precisely controlling the pressure control valve mounted on the commercial vehicle (Source code) is automatically obtained easily and accurately.

FIG. 3 is a flowchart of a control map building process according to an exemplary embodiment of the present invention. Referring to FIG. 3, A brake pedal pressure sensor, a chamber pressure sensor, a pressure sensor, a pressure sensor, and the like, using an internal algorithm of the ECU, A step S13 of matching a current pressure and a target pressure inputted from a wheel speed sensor, a wheel speed sensor, an inlet_pcvvoltage sensor, and an exhaust_solvenvoltage sensor, (S14) of storing data such as a start pressure, a target pressure, a current pressure, an air supply solenoid voltage, an exhaust solenoid voltage, an air supply duty, an exhaust duty, (S15) repeating the steps S11, S12, S13 and S14 until the target pressure reaches 1 bar while decreasing the target pressure and terminating the process if the target pressure reaches 1 bar and the starting pressure is equal to 1 bar The control map of the pressure control valve is established in step S16.

An air supply means for supplying pressure air to the pressure regulating valve and an exhaust means for discharging the air by opening the pressure regulating valve are respectively connected to the output portion of the ECU and the air supply solenoid and the air supply solenoid (Inlet_PCV Voltage Sensor) is connected to the coil of the air supply solenoid to detect the voltage and input to the ECU. An exhaust solenoid voltage sensor (Outlet_PCV) is connected to the coil of the exhaust solenoid, Voltage Sensor) is connected to detect the voltage and input to the ECU.

FIG. 5 illustrates a monitor display output state on a monitoring device (PC). In the left side of the monitor screen, a measured value output graph portion in which a current pressure and a target pressure of a pressure control valve in a simulator are visually represented, (ON / OFF) of the brake, ON / OFF of the brake, ON / OFF of the brake, ASR (ON / OFF) of the brake, A data storage path display section in which a storage path of data obtained from each of the sensors is displayed, and a data storage path display section on the right side of the data storage path display section A save button and a stop button are configured.

In the measured value output graph portion, the data obtained by changing the pressure from the target pressure to the target pressure, for example, 8 bar to 1 bar, is graphically represented.

The operating state data of the pressure regulating valve and the sensed values of various sensors are input to the monitoring equipment (PC) through the ECU and / or DAQ (Data Acquisition), processed and collected, and then a control map of the pressure control valve is constructed.

In the present invention, software (e.g., NI-DAQmx) for controlling a DAQ device, software for testing and setting hardware (for example, Measurement & Automation Explorer (MAX)), (E.g., LabVIEW) that is used to collect, analyze, and represent data.

CAN communication includes CAN communication module, and bidirectional communication between ECU and DAQ is done. The CAN communication (Controller Area Network) is a message communication protocol based on a standard communication standard designed to communicate with a microcontroller or devices without a host computer in a vehicle. Recently, it is often used in industrial automation equipment and medical equipment as well as in vehicles. That is, several hundreds of control units are installed as the automation of the vehicle is progressed. Each unit is provided with the CAN communication (Controller Area Network) to improve the fuel efficiency for all fields of the vehicle, Technology, driver's convenience, etc. are actively achieved in real time.

6 is a control map data chart of the pressure control valve shown in an embodiment of the present invention. The control pressure map includes a start pressure, a target pressure, a current pressure, an inlet solenoid voltage, an exhaust solenoid voltage, an inlet duty, The exhaust duty, the supply / exhaust time, and the like are expressed by numerical values. The pressure unit is bar, the voltage is Volt, the duty is percentage (%), and the time is millimeter (ms).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It is self-evident to those of ordinary skill.

Claims (6)

S1) inputting and setting the starting pressure and the target pressure of the pressure regulating valve;
S2) transmitting a set start pressure value and a target pressure value to the ECU;
S3) the controller matching the target pressure and the current pressure according to an internal algorithm;
S4) measuring a PWM signal and a pressure sensor signal sent from the controller to the pressure control valve for pressure control and storing the measurement signal in the storage means;
S5) When the storage is completed, lower the target pressure and repeat steps S1), S2), and S3), and repeat steps S1), S2), S3), and S4) by lowering the starting pressure when the target pressure is 1 bar.
S6) establishing a pressure control valve control map when the start pressure is 1 bar;
A monitoring system for establishing a pressure estimation map automation of a pressure regulating valve. a) setting a start pressure and a target pressure using input means of a monitoring equipment (PC);
b) transmitting the set start pressure value and the target pressure value to the ECU via CAN communication;
c) using the internal algorithm of the ECU to match the current pressure and the target pressure input from each sensor;
d) storing the matched data in a storage device;
e) repeating steps a), b), c) and d) until the target pressure reaches 1 bar while lowering the starting pressure;
f) terminating if the target pressure reaches 1 bar and the starting pressure equals 1 bar;
A monitoring system for establishing a pressure estimation map automation of a pressure regulating valve. The method of claim 2,
Each sensor in step c)
It can be used as a brake pedal pressure sensor, a chamber pressure sensor, a pressure sensor, a wheel speed sensor, an inlet_pcv voltage sensor, an exhaust solenoid Monitoring system for establishing pressure estimation map automation of pressure regulating valve including voltage sensor (Outlet_PCV Voltage Sensor). The method of claim 2,
The data agreed in step d)
Wherein the pressure control valve includes a pressure control valve, a start pressure, a target pressure, a current pressure, an air supply solenoid voltage, an exhaust solenoid voltage, an air supply duty, an exhaust duty, and an air supply / exhaust time. A brake pedal pressure sensor, a chamber pressure sensor, a plurality of pressure sensors, a plurality of wheel speed sensors, an air supply solenoid voltage sensor, and an exhaust solenoid voltage sensor are connected to the input portion of the ECU,
An air supply means for supplying pressure air to the pressure regulating valve and an exhaust means for exhausting the pressure regulating valve are connected to the output portion of the ECU,
A pressure control valve pressure estimation valve in which a DAQ for CAN communication is connected to the ECU, a monitoring device (PC) constituted by a computer is connected to the DAQ, and a control map of the pressure control valve is stored in the memory device of the monitoring device Monitoring system for map automation construction. The method of claim 5, further comprising:
On the left side of the monitor screen of the monitoring equipment (PC), a measured value output graph section is displayed in which the current pressure and the target pressure of the pressure regulating valve in the simulator are visually represented, and the measured values of various sensors are outputted at the upper right side of the measured value output graph section (ON / OFF) of the brake, ON / OFF of the ABS, and ON / OFF status of the ASR are displayed at the lower end of the measured value output section A cluster alarm unit is constituted and a data storage path display unit in which a storage path of data obtained from each sensor is displayed is formed at the lower end of the cluster alarm unit and a pressure of a pressure control valve composed of a storage button and a stop button is arranged on the right side of the data storage path display unit Monitoring system for estimating map automation construction.

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