Combine having a system estimator to monitor hydraulic system pressure
AssigneeCase Corporation
InventorsYun-Ren Ho, John G. Brome, John E. Bundy
Life of this patent
Estimating the term…
Abstract
An agricultural combine is provided with a controller that estimates a hydraulic pressure of a rotor drive system based upon the speeds of the pump (or engine) and motor that drive the rotor. The pressure is estimated by generating a pump displacement control signal in a convention feedback control algorithm and using that signal together with a sensed motor speed signal and a sensed pump speed (proportional to engine speed) to estimate the hydraulic pressure.
Claims19
An agricultural combine comprising,
- a. a chassis;
- b. an internal combustion engine mounted on the chassis;
- c. a drive system coupled to the engine, the drive system including:
- i. a hydraulic pump coupled to the engine to be driven thereby to provide hydraulic fluid under pressure;
- ii. a hydraulic motor in fluid communication with the hydraulic pump to receive the hydraulic fluid under pressure and be driven thereby;
- iii. a multi-speed gearbox having a plurality of selectable gear ratios;
- iv. a rotor driven by the gearbox and configured to thresh agricultural products;
- and
- d. an electronic control system including:
- i. an engine speed sensor coupled to the engine to generate a signal indicative of engine speed;
- ii. a motor speed sensor coupled to the motor to generate a signal indicative of motor speed;
- and
- iii. at least one electronic controller coupled to the motor speed sensor and the engine speed sensor and configured to estimate the pressure of the hydraulic fluid under pressure.
In a combine including a chassis, an internal combustion engine mounted on the chassis, a drive system coupled to the engine, the drive system including a hydraulic pump coupled to the engine to be driven thereby, a hydraulic motor in fluid communication with the hydraulic pump to be driven thereby, a multi-speed gearbox having a plurality of selectable gear ratios, a rotor driven by the gearbox and configured to thresh agricultural products, an electronic control system, comprising:
- a. an engine speed sensor coupled to the engine to generate a signal indicative of engine speed;
- b. a motor speed sensor coupled to the motor to generate a signal indicative of motor speed;
- and
- c. at least one electronic controller coupled to the motor speed sensor and the engine speed sensor and configured to estimate the pressure of the hydraulic fluid under pressure.
A control system for estimating a hydraulic pressure in a work vehicle, the work vehicle having at least a hydraulic pump and a hydraulic motor coupled together by hydraulic conduits, the conduits being configured to bi-directionally transmit hydraulic fluid between the pump and the motor, the control system comprising:
- a. a motor speed sensor coupled to the motor to generate a signal indicative of the motor speed;
- b. a pump speed sensor coupled to the pump to generate a signal indicative of the pump speed;
- and
- c. at least one electronic controller including a digital microprocessor and an electronic digital memory coupled to the motor speed sensor and the pump speed sensor, the electronic controller being configured to receive signal indicative of the motor speed, and signal indicative of the pump speed and to estimate a hydraulic fluid pressure in the conduits based upon the motor speed signal and the pump speed signal.
Dependencies are inferred from the claim text.