| 摘要 |
An accelerator pedal assembly (12) for electronically controlling a vehic le engine throttle includes a housing (18), a pedal arm (16) pivotally supporte d 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 low er gear. Under these conditions a feel is imparted to the driver's foot indicating th at 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 bi as 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 c am 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). |
