Pressure gradient experiment and influence factor analysis of automotive hydraulic ABS

Based on anti-1ock braking system(ABS) hydraulic test bench, PCMCIA-DAQ1200 acquisition card and LabVIEW software were used, the test program of ABS pressure gradient was written, and the data acquisition was realized automatically.The various experimental tests of ABS pressure gradient were carried out including common braking, long-plus and long-reduction braking and step braking.Test result shows that under common braking, the maximum and minimum decompression gradients are -90.5 and -94.8 MPa·s^-1 respectively, and the maximum and minimum pressurization gradients are 4.1 and 2.7 MPa·s^-1 respectively.Under long-plus and long-reduction braking, the maximum and minimum decompression gradients are -12.1 and -23.0 MPa·s^-1 respectively, and the maximum and minimum pressurization gradients are 21.0 and 4.9 MPa·s^-1 respectively.Under step braking, the maximum and minimum decompression gradients are -1.2 and -3.2 MPa·s^-1 respectively, and the maximum and minimum pressurization gradients are 3.2 and 1.2 MPa·s^-1.The main cylinder pressures of common braking, long-plus and long-reduction braking and step braking are 8, 12, 15 MPa respectively.