Mechanical kickdown for electronic throttle control pedal...

Details Mechanical kickdown for electronic throttle control pedal... Mechanical kickdown for electronic throttle control pedal...

G - Physics

05

G

G05G 1/44 (2009.01) B60K 26/02 (2006.01) F16H 59/20 (2006.01)

Patent

CA 2314410

An accelerator pedal assembly (12) for electronically controlling a vehicle engine throttle includes a housing (18), a pedal arm (16) pivotally supported with respect to the housing (18), and a pedal pad (14) connected to a lower end (20) of the pedal arm (16). The pedal arm (16) is pivotable between an idle position and a maximum applied position as a pedal force is applied to the pedal pad (14). Under certain conditions, the accelerator pedal arm (16) can be pivoted to a position that causes the automatic transmission (40) to kickdown by changing to a next lower gear. Under these conditions a feel is imparted to the driver's foot indicating that a downshift has occurred. To simulate this feel in a drive-by-wire application, the pedal arm (16) presents a cam surface (48) for interacting with a spring (50) that has a first end (52) seated within the housing (18) and a movable second end (54) for bias engagement with the pedal arm (16). The spring (50) includes a roller (60) mounted on the second end (54) that is forced into contact with a lobe (74) on the cam surface (48) when the pedal arm (16) is pivoted from a first operable position to a pre-determined kickdown position. As the roller (60) engages the lobe (74), the pedal force required to further pivot the pedal arm (16) is increased imparting a kickdown feel to the driver via the pedal pad (14).

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