Propulsion control for vehicles

• US 4,933,855 A
• Filed: 12/01/1988
• Issued: 06/12/1990
• Est. Priority Date: 12/12/1987
• Status: Expired due to Fees

• Current Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Inventors: Leiber, Heinz, Kastner, Klaus
• Primary Examiner(s): Chin, Gary
• Application Number:
  US07/278,444
• Time in Patent Office: 558 Days
• Field of Search: 364/426.2, 364/426.3, 180/197, 303/92, 303/100, 303/102, 303/103, 303/106
• US Class Current: 701/82
• CPC Class Codes: B60K 28/16 responsive to, or preventing, skidding of wheels brake control systems for vehicle drive stability B60T8/1755; arrangements responsive to a speed condition for adjusting wheel braking force B60T8/32; control of vehicle driving stability otherwise than by controlling the propulsion unit only B60W30/02; preventing wheel slippage by reducing power in rail vehicles B61C15/00

Abstract

A control variable propulsion control is obtained by taking the difference between: vehicle acceleration sensed by an accelerated sensor and vehicle acceleration derived from a driven axle or a driven wheel rotational speed as sensed by a high resolution sensor for vehicle speeds below a predetermined speed; and between vehicle acceleration derived from non-driven axle or non-driven wheels via a conventional rotational speed sensor and acceleration derived from speed sensed by the high resolution sensors for vehicle speeds above the predetermined speed.

Claims

1. A propulsion controller for a vehicle having non-driven wheels and axle and driven wheels and axle, comprising:

first sensor means for determining a speed of rotation of at least one of the non-driven wheels and the non-driven axle;

vehicle longitudinal acceleration sensor means for sensing longitudinal acceleration of said vehicle;

high-resolution sensor means for determining a speed of rotation of at least one of the driven wheels and the driven axle;

differentiating means for differentiating the speed of said high-resolution sensor means;

comparator means for comparing the speed as obtained from first sensor means with a predetermined speed threshold value;

a circuit means for creating a control signal proportional to a difference between an output signal of said differentiating means and an output signal of said vehicle longitudinal acceleration sensor means as long as the obtained speed from said first sensor means is below the predetermined speed threshold value as determined by the comparator; and

control means for using said control signal as a control input signal for vehicle propulsion control.

2. Propulsion controller according to claim 1 wherein an output signal of said first sensor means is connected to said comparator means as a vehicle speed.

3. Propulsion controller according to claim 1 including determining means for determining longitudinal acceleration of said vehicle from an output signal of said first sensor means;

and wherein said circuit means creates the control signal proportional to a difference between an output signal of said differentiating means and an output signal of said determining means as long as the obtained speed is above the predetermined threshold as determined by the comparator.

4. Propulsion controller according to claim 3 including an adjustment means connecting said high-resolution sensor means and said differentiating means for multiplying said output signal of said high-resolution sensor, which is to be differentiated by said differentiating means, by a predetermined factor as long as the obtained speed from said first sensor means is above said predetermined threshold value as determined by the comparator.

5. Propulsion controller according to claim 3 wherein said determining means includes a differentiating means for differentiating said output signal of said first sensor means.