US 2026/0217499 A1Published application

Hybrid-power control method and system, and crane

AssigneeXuzhou Heavy Machinery Co., Ltd.

InventorsHonggang DING, Jianli LIU, Jianguo ZHAO, Wenzan SUN, Jingqiong JIAO, Zhi MA

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Abstract

A hybrid-power control method, system, and crane are disclosed. A vehicle-body controller: (1) reads an operation-handle opening to set oil-pump displacement; (2) reads pump-outlet pressure to derive hydraulic pressure and required torque; (3) reads accelerator opening to compute required speed and set target speeds for an engine and an electric motor; (4) monitors power-battery state to issue charge/discharge power demands; and (5) integrates torque, speed, and battery data to compute optimal engine torque and keep the engine within an economic operating band. The closed-loop strategy stabilizes lifting operations, raises energy efficiency, and delivers cranes that combine stability, economy, and environmental friendliness

Claims10

Dependent claims

A hybrid-power control method, comprising the following steps:

(1) reading an opening-degree signal of an operation handle through a vehicle body controller, calculating a displacement of an oil pump required by an operation, and sending a control signal to the oil pump, wherein the oil pump operates with the corresponding displacement;
(2) reading information of a pressure sensor at an oil outlet of the oil pump through the vehicle body controller to obtain a pressure of a hydraulic system, and by means of the displacement of the oil pump, calculating a torque required by an operation of a crane;
(3) reading an opening-degree signal of an accelerator through the vehicle body controller, and calculating a rotation speed required by the operation, so as to obtain a target rotation speed of an engine and a target rotation speed of an electric motor;
controlling the electric motor to output the target rotation speed through an electric motor controller;
(4) reading information of an electric quantity and charging and discharging operation power of a power battery through the vehicle body controller, and outputting charging and discharging power requirements of the power battery according to electric balance requirements of a vehicle;
(5) by means of integrating the torque required by the operation of the crane, the target rotation speed of the engine and the target rotation speed of the electric motor, and the charging and discharging power required of the power battery, calculating an optimal torque actually output by the engine, and adjusting the engine to operate within an optimal economic interval.

3 more elements

A hybrid-power control system, comprising:

an operation handle, a pressure sensor disposed at an outlet of an oil pump, an accelerator, a power battery, an engine, an engine controller, an electric motor, an electric motor controller, the oil pump, and a vehicle body controller,
wherein the vehicle body controller being configured to:
(1) read an opening-degree signal of the operation handle, calculate a displacement of the oil pump required by an operation, and send a control signal to the oil pump so that the oil pump operates with the corresponding displacement;
(2) read information from the pressure sensor to obtain a pressure of a hydraulic system and, on the basis of the displacement of the oil pump, calculate a torque required by an operation of a crane;
(3) read an opening-degree signal of the accelerator and calculate a rotation speed required by the operation so as to obtain a target rotation speed of the engine and a target rotation speed of the electric motor, and cause the electric motor controller to control the electric motor to output the target rotation speed;
(4) read information of an electric quantity and charging and discharging operation power of the power battery and output charging and discharging power requirements of the power battery according to electric balance requirements of a vehicle;
and
(5) integrate the torque required by the operation of the crane, the target rotation speed of the engine and the target rotation speed of the electric motor, and the charging and discharging power required of the power battery to calculate an optimal torque actually output by the engine and adjust the engine to operate within an optimal economic interval.

5 more elements

Dependencies are inferred from the claim text.