Sprung mass velocity estimating apparatus

• US 8,108,102 B2
• Filed: 03/12/2008
• Issued: 01/31/2012
• Est. Priority Date: 03/13/2007
• Status: Expired due to Fees

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Furuichi, Takashi, Yamazaki, Koji
• Primary Examiner(s): Tran, Khoi
• Assistant Examiner(s): Holwerda, Stephen
• Application Number:
  US12/046,753
• Publication Number:
  US 20090132121A1
• Time in Patent Office: 1,420 Days
• Field of Search: 188/266.4, 280/5.515, 280/5.5, 280/5.507, 280/5.514, 701/1, 701/29, 701/37, 701/38, 701/40, 701/48, 701/70
• US Class Current: 701/37
• CPC Class Codes: B60G 17/06 Characteristics of dampers , e.g. mechanical dampersB60G17/015 takes precedence
• CPC Class Codes: B60G 2400/0523 Yaw rate
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2400/106 longitudinal with regard to vehicle, e.g. braking
• CPC Class Codes: B60G 2400/206 Body oscillation speed; Body vibration frequency
• CPC Class Codes: B60G 2500/10 Damping action or damper

Abstract

A sprung mass velocity estimating apparatus used in a four-wheeled vehicle to estimate a sprung mass velocity of a point of a vehicle body corresponding to each wheel of the vehicle, includes a state quantity detecting unit which detects a state quantity of the vehicle, a base value calculating unit which calculates a sprung mass velocity base value for each of the four vehicle body points based on a detection result of the state quantity detecting unit by using a prescribed oscillation model, and a sprung mass velocity calculating unit which calculates the sprung mass velocity for each vehicle body point by mutually adjusting the sprung mass velocity base values for the four vehicle body points such that the four vehicle body points are located on a common flat plane.

Claims

1. A sprung mass velocity estimating apparatus used in a four-wheeled vehicle to estimate a sprung mass velocity of a point of a vehicle body corresponding to each wheel of the vehicle, comprising:

a state quantity detecting unit which detects a state quantity of the vehicle;

a base value calculating unit which calculates a sprung mass velocity base value for each of the four vehicle body points based on a detection result of the state quantity detecting unit by using a prescribed oscillation model; and

a sprung mass velocity calculating unit which calculates the sprung mass velocity for each vehicle body point by adjusting the sprung mass velocity base values for the four wheels vehicle body points such that the four vehicle body points are located on a common flat plane,

wherein the sprung mass velocities of the four vehicle body points are calculated from the sprung mass velocity base values according to the following formula;

Vfl=(¼

)(3VBfl+VBfr+VBrl−

VBrr) 

 

(1)

Vfr=(¼

)(3VBfr+VBfl+VBrr−

VBrl) 

 

(2)

Vrl=(¼

)(3VBrl+VBfl+VBrr−

VBfr) 

 

(3)

Vrr=(¼

)(3VBrr+VBfr+VBrl−

VBfl) 

 

(4)

where V denotes the sprung mass velocity, VB denotes the sprung mass velocity base value and suffices denote positions of the vehicle body points, fl, fr, rl and rr indicating front left, front right, rear left and rear right positions, respectively.