US 11,719,593 B2
Small hydraulic leak detection and related methods
Lee Rosenberg, Waterford, MI (US); Keerthan Shetty, Rochester, MI (US); and Kyle Hagen, Lake Orion, MI (US)
Assigned to Continental Automotive Systems, Inc., Auburn Hills, MI (US)
Filed by Continental Automotive Systems, Inc., Auburn Hills, MI (US)
Filed on Apr. 8, 2020, as Appl. No. 16/843,728.
Prior Publication US 2021/0318199 A1, Oct. 14, 2021
Int. Cl. G01M 3/00 (2006.01); G01M 3/26 (2006.01); B60T 17/22 (2006.01); B60T 13/66 (2006.01); B60T 13/68 (2006.01); B60T 13/74 (2006.01)
CPC G01M 3/26 (2013.01) [B60T 13/662 (2013.01); B60T 13/686 (2013.01); B60T 13/745 (2013.01); B60T 17/221 (2013.01); B60T 2270/402 (2013.01); B60T 2270/403 (2013.01); B60T 2270/404 (2013.01); B60T 2270/406 (2013.01); B60T 2270/88 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for detecting a small hydraulic leak of braking fluid in a vehicle, the vehicle having at least a first braking circuit and a second braking circuit, the method comprising:
determining whether system braking pressure falls within a predetermined range;
determining whether leakage exists in at least one of the braking circuits;
determining whether the vehicle is in secure standstill;
isolating the at least one of the braking circuits when a leakage exists in one of the braking circuits; and
monitoring the leakage for at least four cycles while the vehicle is in secure standstill when one of a pressure integral threshold is met and the leakage is above a predetermined level in the at least one of the braking circuits.