A deceleration feedback control system intended for application to vehicles equipped with a brake-by-wire system was designed using two-degree-of-freedom control and model refence control methods. Vehicles with an electrified powertrain use a cooperative regenerative/friction braking system for the purpose of improving fuel economy. When the friction coefficient of the brake pads deviates from the designed central value, deceleration fluctuations can occur in such systems depending on changes in the distribution of brake torque between regenerative braking and friction braking. It was confirmed by both simulations and vehicle tests that the proposed deceleration feedback control system can substantially reduce such deceleration fluctuations. It was also confirmed that this deceleration feedback control system can reduce the effects on the deceleration characteristic of variations in the vehicle weight and brake pad friction coefficient, regardless of whether the driver applies steady or transient brake pedal force. This same improvement can also be obtained in vehicles equipped only with a conventional friction braking system. Accordingly, the use of the proposed deceleration feedback control system can achieve a stable braking feel and is expected to contribute to reducing the drivers workload when braking.
Design of a deceleration feedback control system for stable braking feel
Entwurf eines Bremsvorgang-Regelsystems für stabiles Bremsgefühl
Review of Automotive Engineering (JSAE) ; 28 , 3 ; 393-398
2007
6 Seiten, 9 Bilder, 2 Quellen
Article (Journal)
English
Design of a deceleration feedback control system for stable braking feel
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