Vehicle torque coordination

Abstract

Torque demand is coordinated in a vehicle. Information defining at least one torque production limitation for a first torque producing device is received. A request for torque is compared with the first torque producing device torque production limitation. If the comparison does not result in the request for torque exceeding a limitation, a first coordinated torque request is determined as the request for torque and a null torque is determined as a second coordinated torque request. Otherwise, a first excess requested torque is determined as the difference between the request for torque and the exceeded limitation, the first coordinated torque request is determined as the exceeded limitation, and the second coordinated torque request is determined as the first excess requested torque.

Description

BACKGROUND OF INVENTION 1. Field of the Invention The present invention relates to the control of torque in a vehicle. More particularly, the present invention relates to coordinating torque demands amongst a plurality of vehicular torque producing devices. 2. Background Art Vehicle control systems accept requests from the vehicle driver and various vehicle components as well as output from vehicle parameter sensors. Vehicle controllers use these inputs to generate control signals for vehicle equipment. Conventional control systems applied to automotive vehicle applications were used to improve engine operation in order to reduce vehicle emissions. Since these early attempts, engine controls have continued to grow in complexity as opportunities are identified to make further improvements in performance, emissions, fuel economy, and the like. Since the engine controller is still typically the most complex control system on the vehicle, it remains the primary repository for most n...

AI Technical Summary

Benefits of technology

The present invention is a system for coordinating torque requests in automotive vehicles. The invention uses information to define torque production limitations for each torque producing device and compares them with the torque requests. The system determines which torque requests should be coordinated and which excess torque should be requested. The invention results in improved driveability, fuel economy, and reduced emissions. The system can be used in vehicles with both hybrid and electric power systems. The technical effects of the invention include better torque coordination, improved fuel economy, reduced emissions, and improved driving experience.

Problems solved by technology

The first excess requested torque is compared with the second torque producing device torque production limitations.

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