Control system for controlling an internal combustion engine provided with at least one fuel injection pump

In a control system for controlling an internal combustion engine provided with variable-delivery fuel injection pump means, which system comprises

• an arbitrarily operable control lever,
• an axially movable control rod,
• a servomotor, which is operable to move said control rod in a predetermined axial direction,
• a plurality of sensors for generating output signals representing the position of said control lever and at least one controlled variable, and
• a controller for receiving said output signals and for controlling the operation of said servomotor in dependence on said output signals,
• the improvement residing in that a first lever is provided for mechanically connecting said servomotor to said control rod, which first lever is pivotally movable by said servomotor to move said control rod in said predetermined axial direction,
• a second lever is provided, which is mechanically connected to said control lever and pivotally movable by said control lever to describe a predetermined path,
• first spring means are provided, which oppose the movement of said control rod in said predetermined direction,
• a pawl for alternatively coupling said first and second levers to said control rod is pivoted to said control rod and carries first and second stops,
• second spring means are provided, which urge said pawl to a position of rest, in which said second stop extends in said path,
• third spring means are provided, which urge said first lever to a predetermined inoperative position,
• said servomotor is operable to pivotally move said first lever against the force of said third spring means from said inoperative position to and beyond a predetermined initial actuated position,
• said first lever is arranged to engage said first stop to said initial actuated position, and
• said first lever has moved from said inoperative position to said initial actuated position, and
• said pawl is arranged to move from said position of rest to a second position, in which said first and second stops are disposed outside said path, as said first lever is pivotally moved beyond said initial actuated position.

A control system for controlling an internal combustion engine, comprising,

• a fuel injection pump,
• controlling means connected to said pump for controlling the delivery of said pump,
• an electrical system including a servomotor, a plurality of sensors for generating output signals in response to the operating condition of said engine, and a microcomputer for receiving said output signals, said microcomputer controlling the operation of said servomotor in response to said output signals,
• first connecting means for mechanically connecting said servomotor to said controlling means, said first connecting means being operable by said servomotor to operate said controlling means in response to a first predetermined operation of said electrical system,
• second connecting means connected to said controlling means for operating said controlling means in response to a second predetermined operation of said electrical system,
• a selectively operable lever mechanically connected to said second connecting means,
• means for selectively coupling said first connecting means to said controlling means in response to said first predetermined operation of said electrical system, said means uncoupling said first connecting means and coupling said second connecting means to said controlling means in response to said second predetermined operation of said electrical system,
• wherein said controlling means controls the delivery of said pump when said second connecting means is coupled to said controlling means.