HYBRID WORK MACHINE
First Claim
1. A hybrid work machine, comprising:
- an engine;
a generator motor connected to a drive shaft of the engine;
a storage battery configured to store power generated by the generator motor and supply power to the generator motor;
a motor configured to be driven by at least one of power generated by the generator motor and power stored in the storage battery;
a transformer disposed between the storage battery and both the generator motor and the motor;
a target engine speed calculation unit configured to calculate a target engine speed based on at least an engine load and an output state of the generator motor;
a generation control unit configured to output a generator requesting minimum engine speed, which is a minimum engine speed to secure generation power of the storage battery, in accordance with a storage state of the storage battery and a generator motor speed;
an engine controlling target engine speed calculation unit configured to calculate and output an engine controlling target engine speed based on the target engine speed and the generator requesting minimum engine speed;
an engine control unit configured to control an engine speed based on the engine controlling target engine speed; and
an assist control unit configured to set the target engine speed to the generator controlling target engine speed and control engine assist based on the generator controlling target engine speed and the generator motor speed.
1 Assignment
0 Petitions
Accused Products
Abstract
A hybrid work machine includes: an engine; a generator motor; a storage battery; a motor; a transformer; a target engine speed calculation unit configured to calculate a target engine speed based on at least an engine load and an output state of the generator motor; a generation control unit configured to output a generator requesting minimum engine speed; an engine controlling target engine speed calculation unit configured to calculate and output an engine controlling target engine speed based on the target engine speed and the generator requesting minimum engine speed; an engine control unit configured to control an engine speed based on the engine controlling target engine speed; and an assist control unit configured to set the target engine speed to the generator controlling target engine speed and control engine assist based on the generator controlling target engine speed and the generator motor speed.
35 Citations
12 Claims
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1. A hybrid work machine, comprising:
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an engine; a generator motor connected to a drive shaft of the engine; a storage battery configured to store power generated by the generator motor and supply power to the generator motor; a motor configured to be driven by at least one of power generated by the generator motor and power stored in the storage battery; a transformer disposed between the storage battery and both the generator motor and the motor; a target engine speed calculation unit configured to calculate a target engine speed based on at least an engine load and an output state of the generator motor; a generation control unit configured to output a generator requesting minimum engine speed, which is a minimum engine speed to secure generation power of the storage battery, in accordance with a storage state of the storage battery and a generator motor speed; an engine controlling target engine speed calculation unit configured to calculate and output an engine controlling target engine speed based on the target engine speed and the generator requesting minimum engine speed; an engine control unit configured to control an engine speed based on the engine controlling target engine speed; and an assist control unit configured to set the target engine speed to the generator controlling target engine speed and control engine assist based on the generator controlling target engine speed and the generator motor speed. - View Dependent Claims (6, 7, 11)
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2. A hybrid work machine, comprising:
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an engine; a generator motor connected to a drive shaft of the engine; a storage battery configured to store power generated by the generator motor and supply power to the generator motor; a motor configured to be driven by at least one of power generated by the generator motor and power stored in the storage battery; a transformer disposed between the storage battery and both the generator motor and the motor; a target engine speed calculation unit configured to calculate a target engine speed based on at least an engine load and an output state of the generator motor; a generation control unit configured to output a generator requesting minimum engine speed, which is a minimum engine speed to secure generation power of the storage battery, in accordance with a storage state of the storage battery and a generator motor speed; an engine controlling target engine speed calculation unit configured to calculate and output an engine controlling target engine speed based on the target engine speed and the generator requesting minimum engine speed; an engine control unit configured to control an engine speed based on the engine controlling target engine speed; an output processing unit configured to output the target engine speed as a generator controlling target engine speed at a time the generator requesting minimum engine speed exceeds the target engine speed; and an assist control unit configured to control engine assist based on a generator controlling target engine speed output from the output processing unit, and a generator motor speed. - View Dependent Claims (3, 4, 5, 8, 9, 10, 12)
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Specification