Low-speed antiskid control for multigain hydraulic valve brake system

• US 6,241,325 B1
• Filed: 10/14/1997
• Issued: 06/05/2001
• Est. Priority Date: 10/14/1997
• Status: Expired due to Term

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Griffith, Thomas T., Gowan, John J.
• Primary Examiner(s): Graham, Matthew C.
• Application Number:
  US08/950,130
• Time in Patent Office: 1,330 Days
• Field of Search: 303/176, 303/170, 303/126
• US Class Current: 303/176
• CPC Class Codes: B60T 8/1703 for aircrafts
• CPC Class Codes: B60T 8/325 Systems specially adapted for aircraft

Abstract

A low-speed antiskid control for a multigain hydraulic valve brake system for an airplane is disclosed. The antiskid control includes low- and high-pressure bias modulation (PBM) high step thresholds. At high speeds the low PBM threshold is used to control a PBM high step firing. At low speeds, the high PBM threshold is used to prevent a PBM high step firing unless a deep skid is occurring. The use of a high threshold at low airplane speeds prevents a low speed control loss due to PBM high step firing reducing brake pressure to below minimum brake contact pressure.

Claims

1. In an antiskid control system for a multigain hydraulic brake system that includes a multigain antiskid hydraulic valve, an integral-based pressure bias modulation control algorithm for producing an antiskid control current for application to said multigain antiskid hydraulic valve, and a pressure bias modulation high step current that overrides the antiskid control current when the antiskid control current exceeds a pressure bias modulation threshold, the improvement comprising dual pressure bias modulation thresholds, one threshold being active at low wheelspeeds and the other being active at high wheelspeeds.

2. The improvement claimed in claim 1, wherein the threshold is high at low wheelspeeds and low at high wheelspeeds.