| CPC G01M 3/2876 (2013.01) | 6 Claims |
|
1. A test device for an automatic pressure regulating valve of an electronic braking system (EBS), comprising: an air supply, a pneumatic circuit, a valve, a sensor, a silencer, a signal processing unit and a flow test circuit; wherein
the air supply is configured to supply air to the pneumatic circuit;
the pneumatic circuit comprises a pneumatic trunk and an automatic pressure regulating valve test branch;
an air inlet of the pneumatic trunk is connected to an air outlet of the air supply for controlling an air pressure, controlling air supply, and regulating an air supply pressure;
the automatic pressure regulating valve test branch comprises a control air-in branch, a first air-in branch, a first air exhaust branch, an air-in branch, and an air-out branch; the control air-in branch, the first air-in branch, and the first air exhaust branch are configured to test air tightness of a control chamber of the automatic pressure regulating valve to be tested, and the air-in branch and the air-out branch are configured to test the air tightness of an air-in chamber of the automatic pressure regulating valve to be tested; an air inlet of the control air-in branch is connected to an air outlet of the pneumatic trunk, and an air outlet of the control air-in branch is connected to a control air inlet of the automatic pressure regulating valve to be tested; an air inlet of the first air-in branch is connected to the air outlet of the pneumatic trunk, and an air outlet of the first air-in branch is connected to a first air inlet of the automatic pressure regulating valve to be tested; an air inlet of the first air exhaust branch is connected to a first air exhaust port of the automatic pressure regulating valve to be tested; an air inlet of the air-in branch is connected to the air outlet of the pneumatic trunk, and an air outlet of the air-in branch is connected to an air inlet of the automatic pressure regulating valve to be tested; an air inlet of the air-out branch is connected to an air outlet of the automatic pressure regulating valve to be tested;
the valve comprises a first electro/pneumatic proportional valve, a second electro/pneumatic proportional valve, a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a fifth shut-off valve, a sixth shut-off valve, a seventh shut-off valve, an eighth shut-off valve, and a first air-in valve and a first air exhaust valve of the automatic pressure regulating valve to be tested; the first and second electro/pneumatic proportional valves are configured for intervened braking, and the shut-off valves are configured for pressure regulation; the first electro/pneumatic proportional valve is connected in series in the control air-in branch; the second electro/pneumatic proportional valve and the eighth shut-off valve are sequentially connected in series in the first air-in branch; one side of the second shut-off valve is connected to an air outlet of the first air exhaust branch, and another side of the second shut-off valve is connected to the silencer configured to reduce an air exhaust sound; the first shut-off valve is connected in series in the air-in branch; one side of the fifth shut-off valve is connected to an air outlet of the air-out branch; the first air-in valve and the first air exhaust valve are respectively arranged at the first air inlet and the first air exhaust port of the automatic pressure regulating valve to be tested;
the sensor comprises a first pressure sensor, a second pressure sensor, a first flow sensor and a second flow sensor; the first pressure sensor is arranged in the air-in chamber of the automatic pressure regulating valve to be tested, and the first pressure sensor is configured to measure an air pressure in the air-in chamber; the second pressure sensor is arranged at the air outlet of the automatic pressure regulating valve to be tested, and the second pressure sensor is configured to measure an air pressure at the air outlet of the automatic pressure regulating valve to be tested;
the signal processing unit comprises a data acquisition circuit, a filter circuit, and a relay; a signal input terminal of the filter circuit is connected to a signal output terminal of the sensor, a signal output terminal of the filter circuit is connected to an analog-to-digital conversion interface of the data acquisition circuit, and the filter circuit is configured to filter a signal input into the data acquisition circuit; a coil of the relay is connected to a digital-to-analog conversion interface of the data acquisition circuit, a contact of the relay is connected to a controlled terminal of the valve, and the relay is configured to regulate open/close or a ventilation volume of the valve according to a received signal; a signal transmit-receive terminal of the data acquisition circuit is connected to a signal transmit-receive terminal of an upper computer, and the data acquisition circuit is configured to send sensor data to the upper computer and receive a control signal of the upper computer;
the flow test circuit comprises a first air inlet flow test circuit and an air inlet flow test circuit;
the first air inlet flow test circuit is connected in parallel at two sides of the eighth shut-off valve, and is configured to measure a flow rate of the first air inlet of the automatic pressure regulating valve to be tested;
the air inlet flow test circuit is connected in parallel at two sides of the first shut-off valve, and is configured to measure a flow rate of the air inlet of the automatic pressure regulating valve to be tested;
the sixth shut-off valve, the second flow sensor, and the seventh shut-off valve are sequentially connected in series in the first air inlet flow test circuit; and
the third shut-off valve, the first flow sensor, and the fourth shut-off valve are sequentially connected in series in the air inlet flow test circuit.
|