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Abstract
A new type of charging valve with electro-hydraulic closed-loop feedback is designed, and a wet multi-disc dual-circuit service brake is built based on AMEsim. The charging and discharging characteristics of the accumulator are studied. The results show that under the condition of a medium-flow constant current source, the dual-circuit accumulator responds quickly, and a single charging can smoothly provide multiple stable discharge output. The response to the pressure output caused by the static structural parameters of the tandem braking valve and the pedal signal is studied. The results show that: the pedal signal can significantly change the brake pressure output, but the preload of the return spring is not apparent; the change of the cross-sectional diameter of the rear axle spool will cause the spool opening lags, and the difference in the spool diameter will cause the spool closing lags. The time response performance of single-axle braking and dual-axle braking is studied. The response from environmental factors such as road adhesion coefficient, slope, load, and brake cool modes to braking distance, braking deceleration, and braking temperature is studied. We establish a parameter ranges of braking safety zone and braking safety comfort zone. This study provides a comparison and reference to the design of a new charging valve and the performance test of the service braking system of heavy vehicles.
Highlights
The service braking system for heavy vehicles with pneum-atic braking or full hydraulic braking usually consists of two parts in series: the charging circuit and the brake circuit
We explore the response of the vehicle load and slope to braking distance, deceleration, and brake temperature
The closed state of the differential pressure valve instantly increases the pressure in the primary oil circuit, causing the balance valve to switch to the left position
Summary
The service braking system for heavy vehicles with pneum-atic braking or full hydraulic braking usually consists of two parts in series: the charging circuit and the brake circuit. Moaveni and Barkhordari [17] modeled and recognized the hydraulic anti-skid braking system, and designed a control algorithm driven by inform-ation on the road conditions (dry, wet, etc.). Zamzamzadeh [25] et al studied the effect of brake pedal force on the braking distance of heavy vehicles under wet road conditions. Through imaginative design or algorithm control, the key indicators that affect braking performance (such as: wheel-road adhesion coefficient, vehicle speed, braking force distribution, etc.) are studied. Based on the extensive engineering applicati-on of Simcenter AMESim software in hydraulic system modeling and simulation, this article studies the braking performance of the conventional braking system of heavy vehicles.
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