Process for undercarriage regulation

• US 5,383,124 A
• Filed: 11/04/1992
• Issued: 01/17/1995
• Est. Priority Date: 05/20/1989
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kunz, Dieter, Kallenbach, Rainer
• Primary Examiner(s): Trans, Vincent N.
• Application Number:
  US07/971,686
• Time in Patent Office: 804 Days
• Field of Search: 364/424.01, 364/424.05, 280/707, 280/840
• US Class Current: 701/37
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 17/08 Characteristics of fluid dampers adjusting fluid dampers in general F16F9/44 - F16F9/53
• CPC Class Codes: B60G 2202/24 Fluid damper
• CPC Class Codes: B60G 2204/80 Interactive suspensions; arrangement affecting more than one suspension unit
• CPC Class Codes: B60G 2400/102 vertical
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2400/20 Speed
• CPC Class Codes: B60G 2400/204 Vehicle speed
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2400/41 Steering angle
• CPC Class Codes: B60G 2400/822 Road friction coefficient determination affecting wheel traction
• CPC Class Codes: B60G 2500/104 continuous
• CPC Class Codes: B60G 2600/14 Differentiating means, i.e. differential control
• CPC Class Codes: B60G 2600/184 Semi-Active control means

Abstract

The invention relates to a process for the undercarriage regulation of vehicles, especially of passenger and utility motor vehicles, in which the undercarraige properties are varied in dependence on the particular sensor-determined traveling state by the regulating system. For an adaptation of the undercarriage tuning to the various requirements in respect to traveling comfort and traveling safety it is provided that the regulator parameters (R) of the regulating circuit are automatically varied in dependence on the dynamics of the traveling process.

Claims

1. An undercarriage regulation apparatus for a vehicle having a vehicle body, comprising:

at least one of a first sensor means for sensing at least one velocity of the vehicle body in a vertical direction to produce a first signal indicative thereof and a second sensor means for sensing at least one relative displacement between the vehicle body and at least one axle of the vehicle to produce a second signal indicative thereof;

third sensor means for sensing at least one of a vehicle longitudinal velocity, vehicle longitudinal acceleration, vehicle transverse acceleration, yawing velocity and steering angle and outputting a third signal indicative thereof;

a converting circuit for receiving said third signal and outputting at least one regulation parameter signal; and

a regulator for receiving said regulation parameter signal and at least one of said first signal and said second signal, said regulator exhibiting one of at least two transfer functions dependent on said regulation parameter signal, said regulator including means for outputting a control signal to at least one actuator of the undercarriage for attuning undercarriage characteristics;

wherein in noncritical travelling states, said regulation parameter signal is adjusted to provide a comfort-oriented attuning of said undercarriage characteristics, and in critical travelling states, said regulation parameter signal is adjusted utilizing one of a continuous and stepped transition to provide a safety-oriented attuning of said undercarriage characteristics.

2. The regulation apparatus according to claim 1, further comprising a measuring and evaluating device connected between said third sensor means and said converting circuit, and wherein a value of the vehicle longitudinal velocity and the vehicle longitudinal acceleration is utilized by said measuring and evaluating device to generate an approximation value for the tire longitudinal forces that is outputted from said measuring and evaluating device.

3. The regulation apparatus according to claim 2, wherein said approximation value for the tire longitudinal forces is inputted to said converting circuit, said regulation parameter signal dependent on said approximation value.

4. The regulation apparatus according to claim 3, wherein said converting circuit outputs said regulation parameter utilizing at least one of a stored value table and a computing operation.

5. The regulation apparatus according to claim 1, wherein the vehicle transverse acceleration, yawing velocity, and steering angle correspond to transverse dynamics of the vehicle.

6. The regulation apparatus according to claim 5, further comprising a measuring and evaluating device connected between said third sensor means and said converting circuit, and wherein a value of said transverse dynamics is utilized by said measuring and evaluating device to generate an approximation value for the tire lateral forces that is outputted from said measuring and evaluating device.

7. The regulation apparatus according to claim 6, wherein said approximation value for the tire lateral forces is inputted to said converting circuit, said regulation parameter signal dependent on said approximation value.

8. The regulation apparatus according to claim 7, wherein said converting circuit outputs said regulation parameter utilizing at least one of as stored value table and a computing operation.

9. The regulation apparatus according to claim 1, wherein said at least one actuator comprises at least on damper, and wherein said outputted control signal regulates the damping properties of said at least one damper.

10. An undercarriage regulation apparatus for a vehicle having a vehicle body, comprising:

first sensor means for sensing a relative displacement between the vehicle body and a suspension member to produce a first signal indicative thereof;

second sensor means for sensing at least one of a vehicle longitudinal velocity, vehicle longitudinal acceleration, vehicle transverse acceleration, yawing velocity and steering angle, and outputting a second signal indicative thereof; and

a regulator for receiving said first signal and said second signal, said regulator exhibiting one of at least two transfer functions dependent on said second signal, said regulator including means for outputting a control signal based upon said first and second signals to at least one actuator of the undercarriage for attuning undercarriage characteristics, wherein in noncritical travelling states, said regulation parameter signal is adjusted to provide a comfort-oriented attuning of said undercarriage characteristics, and in critical travelling states, said regulation parameter signal is adjusted utilizing one of a continuous and stepped transition to provide a safety-oriented attuning of said undercarriage characteristics.

11. An apparatus for regulating an undercarriage of a vehicle, the undercarriage including at least one actuator and regulable in a travel-comfort mode and a travel-safety mode, the vehicle including a body and at least one axle, said apparatus comprising:

at least one of a first sensor and a second sensor, said first sensor sensing at least one velocity of the vehicle body in a vertical direction and providing a first output signal corresponding thereto, said second sensor sensing at least one relative displacement between the vehicle body and an axle and providing a second output signal corresponding thereto;

a third sensor sensing at least one of a vehicle longitudinal velocity, vehicle longitudinal acceleration, vehicle transverse acceleration, yawing velocity and steering angle and providing a third output signal corresponding thereto;

a converting circuit for receiving said third output signal and providing an output signal representing a control parameter, wherein in noncritical travelling states, said control parameter is adjusted to provide a comfort-oriented attuning of said undercarriage characteristics, and in critical travelling states, said control parameter is adjusted utilizing one of a continuous and stepped transition to provide a safety-oriented attuning of said undercarriage characteristics in critical travel states; and

a regulator for receiving said converter circuit output signal and at least one of said first and second output signals, said regulator having one of at least two transfer functions dependent on said converter circuit output signal and providing an output signal to said at least one actuator.