Foot pedal module

• US 8,312,789 B2
• Filed: 07/30/2009
• Issued: 11/20/2012
• Est. Priority Date: 08/13/2008
• Status: Expired due to Fees

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Beck, Werner
• Primary Examiner(s): Chambers, Troy
• Assistant Examiner(s): PRATHER, GREGORY T
• Application Number:
  US12/512,193
• Publication Number:
  US 20100037726A1
• Time in Patent Office: 1,209 Days
• Field of Search: 745/12, 745/13, 745/14, 745/60
• US Class Current: 74/513
• CPC Class Codes: G05G 1/38 comprising means to continuously detect pedal position
• CPC Class Codes: G05G 1/44 pivoting
• CPC Class Codes: G05G 5/03 Means for enhancing the operator's awareness of arrival of the controlling member at a command or datum position; Providing feel, e.g. means for creating a counterforce arrangements for indicating the position of the controlling member G05G1/015
• CPC Class Codes: Y10T 74/20534 Accelerator
• CPC Class Codes: Y10T 74/2054 Signal
• CPC Class Codes: Y10T 74/20888 Pedals

Abstract

A foot pedal module (1) including an enclosure (3), a rotor (11), a foot pedal (15), two springs (17, 19) and a circuit board (33). The enclosure (3) has a trunnion (5), an outer ring (29) and a cover (39) for accommodating and protecting the rotor (11). The rotor (11) is linked with a bushing (7), a tappet, a lever (13), two haptic springs (17, 19), two damping elements (21, 23) and a driving element (27). The circuit board (33) carries an inductor array (25) which are designed as flat coils and located opposite the damping elements (21, 23). The foot pedal (15) is linked to the lever (13) and bushing (7) by a ball joint (35) and a socket (27).

Claims

1. A foot pedal module (1) comprising:

an enclosure (3),

a rotor (11),

a foot pedal (15),

two haptic springs (17,19), and

a circuit board (33),

the enclosure (3) comprising a cylindrical trunnion (5), an outer ring (29), and a cover (39) for positioning and protecting the rotor (11), the two haptic springs (17, 19) and the circuit board (33), and the rotor (11) being linked to a bushing (7), a lever (13), the two haptic springs (17, 19), two damping elements (21, 23) and a driving element (27), the bushing being rotationally supported by an exterior of the trunnion and having an inner extension that axially extends through an interior of the trunnion, the rotor being drivingly coupled to the inner extension of the bushing,

the damping elements (21, 23) being carried on a front face of the rotor (11);

the circuit board (33) carrying an inductor array (25) in a shape and form of flat spiral coils;

the inductor array (25) being positioned opposite the damping elements (21, 23), and between the circuit board and the front face of the rotor (11), a foot pedal angular position signal is generated by the inductor array (25) and is based on movement of the damping elements (21, 23) with respect to the inductor array (25); and

the foot pedal (15) being linked with the lever (13) and the bushing (7) via a ball joint (35) and a socket (37).

2. The foot pedal module (1) according to claim 1, wherein a return spring (41) is directly linked to and between the bushing (7) and the rotor (11), the return spring (41) biases the rotor (11) into an error position when an interruption of a link (35, 37) between the foot pedal (15) and the lever (13) occurs.

7. The foot pedal module (1) according to claim 1, wherein at least one of the two haptic springs (17, 19), the two damping elements (21, 23), or the inductor array (25), is designed to be redundant.

12. The foot pedal module (1) according to claim 1, wherein the trunnion (5), the bushing (7), the two haptic springs (17, 19), the outer ring (29) and the rotor (11) are all arranged concentrically with respect to one another.

3. A foot pedal module (1) being mechanically connected with a foot pedal (15) through a link (35, 37), the foot pedal module comprising:

an enclosure (3) having an axially extending cylindrical trunnion,

a rotor (11),

a bushing being rotationally supported by an exterior of the trunnion and axially extending through an interior of the trunnion, the bushing being drivingly connected to the rotor such that the bushing and the rotor rotate in unison,

first springs (17, 19), and

a circuit board (33),

a front face of the rotor (11), which is activated via the bushing by the foot pedal (15), carrying at least one activating element (21, 23),

the circuit board (33) having coil arrays, designed as one of flat coils (25) and hall sensors, being positioned opposite to the activating element (21, 23), a foot pedal angular position signal is generated by the coil arrays and is based on movement of the activating elements (21, 23) with respect to the coil arrays, and

a constant gap being located between the circuit board (33) and the activating element (21, 23); and

the coil arrays being positioned between the circuit board and the front face of the rotor (11).

4. The foot pedal module (1) according to claim 3, wherein the least one activating element is an eddy current damping element (21, 23), movement of the eddy current damping element in relation to the flat coils alters at least one of an inductance of the flat coils (25) and a resonant frequency on the circuit board (33).

5. The foot pedal module (1) according to claim 3, wherein at least one of the activating elements is an eddy current damping element (21, 23) movement of the eddy current damping element in relation to the flat coils alters a magnetic coupling excitation of at least one of the flat coils with the flat sensor inductor (25).

6. The foot pedal module (1) according to claim 3, wherein the coil arrays are hall sensors and the at least one activating element is a permanent magnet, a signal is generated by the hall sensor, the signal indicates an angular position of the foot pedal which is based on movement and overlap of the permanent magnet with respect to the hall sensor.

8. The foot pedal module (1) according to claim 3, wherein the enclosure (3) includes the trunnion (5), an outer ring (29) and a cover (39) for accommodating and protecting the rotor (11), the first springs (17, 19) and the circuit board (33).

9. The foot pedal module (1) according to claim 3, wherein two activating elements (21, 23) are provided and the two activating elements (21, 23) are each damping elements (21, 23);

and the rotor (11) is linked with the bushing (7), a driving element (27), and the first springs (17, 19), and also comprises a lever (13) and the two damping elements (21, 23), the first springs are two haptic springs (17, 19).

10. The foot pedal module (1) according to claim 3, wherein the foot pedal (15) is flexibly linked, via a ball joint (35) and a socket (37), with a lever (13) of the bushing (7).

11. The foot pedal module (1) according to claim 3, wherein a second spring directly engages with only the enclosure (3) and the rotor (11) and, upon an interrupt of the link (35, 37) between the foot pedal (15) and a lever (13), the second spring, which is a return spring, biases the rotor (11) into a desired position.

13. The foot pedal module (1) according to claim 3, wherein the trunnion (5), defines a rotational axis, and the enclosure (3) comprises an outer ring (29) which is coaxial with the trunnion (5) and axially extends opposite from the trunnion (5);

the rotor (11) is coaxially aligned with the trunnion (5) on the bushing (7) which coaxially extends through a radial interior and on a radial exterior of the trunnion such that the bushing radially encloses the trunnion (5), the bushing (7) comprises a driving element (27) which engages and rotatably drives the rotor (11) as the bushing (7) rotates, the rotor (11) is supported by the outer ring (29), and the bushing (7), the driving element (27) and the rotor (11) are rotatable with respect to the trunnion (5) and the circuit board (33)

a lever (13) is integrally coupled to the bushing (7), and the link (35, 37) couples the foot pedal (15) to the lever (13) such that the bushing (7) rotates when the foot pedal (15) is actuated;

the first springs (17, 19) surround the bushing (7) and apply a resistant force on the bushing (7) that is opposite to a direction of rotation when the bushing (7) is driven by the foot pedal (15), the first springs (17, 19) each applies a substantially equal amount of the resistant force on the bushing (7); and

the trunnion (5), the bushing (7), the first springs (17, 19), the outer ring (29) and the rotor (11) are all arranged concentrically with respect to one another.

14. The foot pedal module according to claim 13, wherein the trunnion comprises an axially extending outer face and the bushing is cylindrical and comprises an outer surface which axially extends in a first direction away from the rotor, the outer surface of the bushing slidably mates with and overlays the outer face of the trunnion such that the bushing rotates about the rotational axis in relation to the trunnion.

15. The foot pedal module according to claim 14, wherein the lever is integral with the outer surface of the bushing and extends radially therefrom, and the first springs encircle the outer surface of the bushing.

16. The foot pedal module according to claim 14, wherein the bushing comprises an end surface, which extends radially, inwardly from the outer surface of the bushing, and an inner projection that axially extends in a second direction toward the rotor, remote ends respectively of the inner projection and the outer surface are integrally continuously coupled to each other by the end surface, the outer face of the trunnion axially extends radially between the outer surface and the inner projection of the bushing.

17. The foot pedal module according to claim 16, wherein the driving element is integral with the inner projection of the bearing such that the driving element rotatably drives the rotor about the rotational axis as the bushing rotates about the rotational axis.

18. The foot pedal module according to claim 13, wherein the rotor comprises an axially extending flange and the outer ring of the enclosure comprises an axially extending outer surface, the flange of the rotor slidably mates with the outer surface of the outer ring of the enclosure such that the rotor is rotatably supported by the outer ring of the enclosure.