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To address the issue of insufficient estimation accuracy of the Hydraulic Control Unit (HCU) wheel cylinder pressure estimation algorithm for an integrated wire controlled hydraulic braking system with eight valve structure, this article proposed wheel cylinder hydraulic pressure estimation algorithm that can replace pressure sensors. The article first proposed a wheel cylinder hydraulic pressure estimation algorithm based on the Bernoulli principle, and then analyzed the basic characteristics of the hydraulic adjustment unit and the Pressure Volume (PV) characteristics of the brake fluid based on hardware in the loop experimental bench testing. Finally, it was verified through actual vehicle experiments. The experimental results show that under basic braking conditions, the root mean square error of the proposed wheel cylinder pressure estimation algorithm is within 0.259 MPa, the root mean square error under active braking conditions is within 0.374 MPa, which is equivalent to the accuracy of the scheme with added pressure sensors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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