Method of generating control/regulation signals for a vehicle chassis

• US 5,303,155 A
• Filed: 06/24/1991
• Issued: 04/12/1994
• Est. Priority Date: 06/23/1990
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kallenbach, Rainer, Landesfeind, Klaus, Kunz, Dieter
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US07/719,806
• Time in Patent Office: 1,023 Days
• Field of Search: 364/424.05, 364/424.01, 280/707
• 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 2400/102 vertical
• CPC Class Codes: B60G 2400/202 Piston speed; Relative velocity between vehicle body and wheel
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2500/10 Damping action or damper
• CPC Class Codes: B60G 2500/20 Spring action or springs
• CPC Class Codes: B60G 2600/14 Differentiating means, i.e. differential control
• CPC Class Codes: B60G 2600/74 Analog systems
• CPC Class Codes: G05D 19/02 characterised by the use of electric means

Abstract

Described is a process for conditioning of sensor signals for at least one of undercarriage regulation and control. The objective of this process is to superimpose on processed first signals which represent the acceleration of the vehicle body the low-frequency information absent from the signal of a vehicle body acceleration sensor by a circuit of simple design through a defined superimposition with the sensor signals corresponding to at least one of the spring deflection path and the spring deflection velocity. For that purpose, the sensor signals to be superimposed are processed in filter units whose transfer functions show a specific functional correlation.

Claims

1. A method of generating control/regulation signals for at least one of control and regulation of a chassis on a vehicle, the vehicle including a body and a plurality of wheels, the chassis including at least one of a shock absorber and spring, comprising the steps of:

sensing an acceleration of the vehicle body;

providing first signals representing said sensed acceleration;

sensing relative movements between the vehicle body and wheels;

providing second signals representing said sensed relative movements;

filtering said first signals in a first filtering means, said first filtering means having at least a high-pass type transfer performance and providing output signals representing high-frequency portions of said first signals;

filtering said second signals in a second filtering means, said second filtering means having a transfer performance dependent on the transfer performance of said first filtering means and providing output signals representing low-frequency portions of said second signals;

additively combining said first filtering means output signals and said second filtering means output signals in a linkage means providing respective output signals; and

generating said control/regulation signals dependent on said linkage means output signals.

2. The method of claim 1, comprising the further step of controlling and regulating the chassis utilizing said control/regulation signals.

3. The method of claim 1, wherein said second filtering means is dependent on said transfer performance of said first filtering means according to the correlation:

space="preserve" listing-type="equation">G2(s)=1-s*G1(s),

where said second signals represent at least one of spring deflection velocities of the body relative to the wheels, and gas pressure differences in the shock absorbers;

and said second filtering means is dependent on said transfer performance of said first filtering means according to the correlation;

space="preserve" listing-type="equation">G2(s)=s-s.sup.2 *G1(s),

where said second signals represent a spring deflection path of the body relative to the wheels.

4. The method of claim 1, comprising the further steps of multiplying at least one of said first and second signals, and said filtered first and second signals, with weighting factors.