Engine idle rotation speed controller
AssigneeNissan Motor Co., Ltd.
InventorMasaaki Ashida
Life of this patent
Estimating the term…
Abstract
A rotation speed is feedback controlled to a target rotation speed during idle running of an engine. When an automatic transmission is in a travel range, a brake is being operated and a vehicle speed is less than a predetermined value, the target rotation speed is decreased. A required vehicle creep force is different according to whether the vehicle has substantially stopped such as when it is waiting on a crossing, or whether it is moving in the idle running state as when it is being garaged or is following a vehicle in front of it in a traffic jam. By decreasing the target rotation speed according to the vehicle speed, an optimum creep force is obtained in both cases.
Claims13
An idle rotation speed feedback controller for use with an engine provided for a vehicle, said engine being connected to an automatic transmission, comprising:
- a sensor for detecting a real engine rotation speed,
- a sensor for detecting a travel range of said automatic transmission,
- a sensor for detecting a brake operation of said vehicle,
- a sensor for detecting a vehicle speed,
- a mechanism for varying a torque generated by said engine, and
- a microprocessor programmed to:
- set an engine target rotation speed during idle running of the engine;
- feedback control the torque varying mechanism according to a difference between the real rotation speed and the target rotation speed;
- and
- apply a decrease correction to the target rotation speed when the automatic transmission is within a travel range, the brake is operated during idle running of the engine and the vehicle speed is lower than a predetermined value.
An idle rotation speed feedback controller for use with an engine provided for a vehicle, said engine being connected to an automatic transmission, comprising:
- a sensor for detecting a real engine rotation speed,
- a sensor for detecting a travel range of said automatic transmission,
- a sensor for detecting a brake operation of said vehicle,
- a sensor for detecting a vehicle speed,
- a mechanism for varying a torque generated by said engine,
- means for setting an engine target rotation speed during idle running of the engine,
- means for feedback controlling an engine torque according to a difference between the real rotation speed and the target rotation speed, and
- means for applying a decrease correction to the target rotation speed when the automatic transmission is within a travel range, the brake is operated during idle running of the engine and the vehicle speed is lower than a predetermined value.
Dependencies are inferred from the claim text.