Speed control system for motor vehicles operating in a curved path
First Claim
1. Speed control system for a motor vehicle, to control the speed of operation of the vehicle when the vehicle operates in a curved path, comprisinglateral force sensing means (1d, 1e) secured to the vehicle for sensing lateral forces (SV, SH) and deriving sensed lateral force signals;
- means receiving said lateral force signals for determining change in lateral forces (Δ
SV, Δ
SH) with respect to time and deriving lateral force change signals;
means (1a, 1b, 1c) for determining the slip angle (δ
V, δ
H) of the vehicle, as the vehicle operates in the path which is curved and deriving a slip angle signal;
means coupled to said slip angle determination means (1a, 1b, 1c) for determining the change of the slip angle and deriving a slip angle change signal;
quotient deriving means (7) coupled to said change in lateral force sensing means and said slip angle change signal deriving means, and receiving said lateral force change signals and said slip angle change signals (Δ
SV /Δ
δ
V ;
Δ
SH /Δ
δ
H) for at least one of said front and rear wheels, respectively;
to obtain a quotient signal representative of the quotient of the lateral force change signals and said slip angle change signals;
comparator means (8) coupled to said quotient deriving means (7) receiving said quotient signal and comparing said quotient signal with a predetermined reference value (K) and deriving a comparison output signal; and
means (12, 2,
4) responsive to said comparison output signal for controlling the speed of the vehicle if the comparison output signal derived from said comparator means (8) is indicative that said quotient has passed the predetermined reference value.
1 Assignment
0 Petitions
Accused Products
Abstract
To prevent slip-out or slide-out of a vehicle operating in a curve, the lateral stability or, respectively, instability of the vehicle is determined and, if instability or incipient instability is sensed, the vehicle is automatically braked, and/or engine torque of the vehicle engine is reduced. A reference parameter K, which may be variable in accordance with vehicle operating and operation conditions, is compared with a quotient of change of lateral forces applied to the front (V) and hind or rear (H) axles with respect to the change of the slip angle (δV, δH), and if the change of lateral force (ΔS /Δ.sub.δ) at the respective axles, and passes the reference K. The respective axles can then be together or selectively braked in accordance with the extent of deviation from said comparison reference K and/or engine torque also reduced.
162 Citations
25 Claims
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1. Speed control system for a motor vehicle, to control the speed of operation of the vehicle when the vehicle operates in a curved path, comprising
lateral force sensing means (1d, 1e) secured to the vehicle for sensing lateral forces (SV, SH) and deriving sensed lateral force signals; -
means receiving said lateral force signals for determining change in lateral forces (Δ
SV, Δ
SH) with respect to time and deriving lateral force change signals;means (1a, 1b, 1c) for determining the slip angle (δ
V, δ
H) of the vehicle, as the vehicle operates in the path which is curved and deriving a slip angle signal;means coupled to said slip angle determination means (1a, 1b, 1c) for determining the change of the slip angle and deriving a slip angle change signal; quotient deriving means (7) coupled to said change in lateral force sensing means and said slip angle change signal deriving means, and receiving said lateral force change signals and said slip angle change signals (Δ
SV /Δ
δ
V ;
Δ
SH /Δ
δ
H) for at least one of said front and rear wheels, respectively;to obtain a quotient signal representative of the quotient of the lateral force change signals and said slip angle change signals; comparator means (8) coupled to said quotient deriving means (7) receiving said quotient signal and comparing said quotient signal with a predetermined reference value (K) and deriving a comparison output signal; and means (12, 2,
4) responsive to said comparison output signal for controlling the speed of the vehicle if the comparison output signal derived from said comparator means (8) is indicative that said quotient has passed the predetermined reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. Speed control system for a motor vehicle, for controlling the speed of operation of the vehicle when operating in a curved path, comprising
lateral force sensing means (1d, 1e) secured to the vehicle (1) for sensing lateral forces (SV, SH); -
means (1a, 1b, 1c) for determining the lateral slip angle (δ
V, δ
H) of the vehicle, as the vehicle operates in a path which is curved;means for determining the change in forces acting on the vehicle based on said lateral forces and said lateral slip angle as the vehicle operates in a curved path; and means for reducing the speed of the vehicle if the change in forces acting on the vehicle as it moves in a curved path indicates a tendency of the vehicle to veer off a steered course. - View Dependent Claims (22, 23)
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24. Speed control system for a motor vehicle, for controlling the speed of operation of the vehicle when operating in a curved path, comprising
sensing means secured to the vehicle for sensing change in lateral forces (Δ - SV, Δ
SH) with respect to time;means for determining the change of the angle of lateral slip (Δ
δ
V, Δ
δ
H) as the vehicle operates in a path which is curved;quotient deriving means (7) coupled to said lateral forces change sensing means and to said lateral slip angle change determining means and deriving a changing quotient representative of the change in lateral forces and the change of the angle of lateral slip,, and deriving a signal representative of the change of said quotient; and means (12, 2,
4) for reducing the speed of the vehicle if the change in said quotient reaches a critical limit indicative of a tendency of the vehicle to veer off a given course. - View Dependent Claims (25)
- SV, Δ
Specification