FUel jet volume controller

Abstract

A fuel injection quantity control device includes: vehicle speed detection unit; gear position detection unit; engine revolution speed detection unit; accelerator opening degree detection unit; target acceleration value computation unit for finding a basic target acceleration value corresponding to the difference between the set limit vehicle speed and an actual vehicle speed and an upper limit value and lower limit value of the basic target acceleration value for each gear position in a map, limiting the basic target acceleration value with the upper limit value and lower limit value, and determining a target acceleration value; basic fuel injection quantity for vehicle speed limit computation unit for determining a basic fuel injection quantity for vehicle speed limit by feedback computation from the difference between the determined target acceleration value and the actual acceleration value; an accelerator required injection quantity computation unit for computing an accelerator required injection quantity from the engine revolution speed and accelerator opening degree; and vehicle speed limit injection quantity computation unit for selecting the smaller of the basic fuel injection quantity for vehicle speed limit and accelerator required injection quantity and setting it as a fuel injection quantity for vehicle speed limit.

Description

1. Field of Invention [0001] The present invention relates to a fuel injection amount control device, which is used to limit the fuel injection amount to prevent the speed of a vehicle from exceeding a set limit vehicle speed. 2. Background technology [0002] According to normal restrictions or to reduce noise or fuel consumption, the maximum speed of trucks and tractors is sometimes restricted. [0003] This kind of vehicle speed limit control is implemented as follows: when the vehicle speed reaches the speed limit, the amount of fuel injected into the engine is restricted so that the vehicle speed does not exceed the speed limit. [0004] More specifically, if the vehicle speed limit control is activated, the difference between the actual acceleration value and the target acceleration value will be calculated, and a proportional term and an integral term will be obtained from the difference. By combining these proportional and integral terms The vehicle speed limit basic fuel...

AI Technical Summary

Problems solved by technology

[0007] However, there is a problem in the control device described in the above-mentioned Japanese Patent Application Publication No. H10-250408 that the fuel injection amount corresponding to the gear position is not taken into account, so that sometimes even if the injection amount is the same, it may be caused by the speed of the vehicle depending on the gear position. Overspray due to position change

Images