초록 ▼

A hybrid construction machine includes: an electric storage device temperature adjustment circuit; an engine cooling circuit including a first coolant and switchable between a state the first coolant after cooling the engine is introduced into the electric storage device temperature adjustment circu

A hybrid construction machine includes: an electric storage device temperature adjustment circuit; an engine cooling circuit including a first coolant and switchable between a state the first coolant after cooling the engine is introduced into the electric storage device temperature adjustment circuit and a state stopping introduction of the first coolant into the electric storage device temperature adjustment circuit; an equipment cooling circuit that cools, with a second coolant, equipment needing cooling, and switchable between a state the second coolant is introduced into the electric storage device temperature adjustment circuit and a state stopping introduction of the second coolant into the electric storage device temperature adjustment circuit; and a controller controlling the engine cooling circuit, the equipment cooling circuit, and a lead-out switching valve such that the first coolant or second coolant selectively flows, according to whether the electric storage device needs to be warmed or cooled.

대표청구항 ▼

1. A hybrid construction machine comprising: an engine as a power source;an electric storage device that is set to an appropriate temperature lower than an appropriate temperature of the engine;equipment that needs cooling, including a motor and a controller therefor, and set to an appropriate tempe

1. A hybrid construction machine comprising: an engine as a power source;an electric storage device that is set to an appropriate temperature lower than an appropriate temperature of the engine;equipment that needs cooling, including a motor and a controller therefor, and set to an appropriate temperature lower than the appropriate temperature of the electric storage device;an electric storage device temperature adjustment circuit for maintaining the electric storage device at the appropriate temperature;an engine cooling circuit cooling the engine with a first coolant;a warm-up switching valve that is provided in the engine cooling circuit and capable of switching between an electric storage device warm-up position in which the first coolant after cooling the engine is introduced into the electric storage device temperature adjustment circuit and an electric storage device non-warm-up position in which the introduction of the first coolant into the electric storage device temperature adjustment circuit is stopped;an equipment cooling circuit that cools, with a second coolant, the equipment that needs cooling, and that is capable of switching between a state in which the second coolant is introduced into the electric storage device temperature adjustment circuit and a state in which the introduction of the second coolant into the electric storage device temperature adjustment circuit is stopped;a lead-out switching valve that is capable of switching between an engine-side lead-out position in which the first coolant located inside the electric storage device temperature adjustment circuit is led out to the engine cooling circuit, and an equipment-side lead-out position in which the second coolant located inside the electric storage device temperature adjustment circuit is led out to the equipment cooling circuit;an electric storage device temperature sensor detecting the temperature of the electric storage device; andcontrol means for controlling operation of the warm-up switching valve, the equipment cooling circuit, and the lead-out switching valve in such a manner that the second coolant or the first coolant after cooling the engine selectively flows inside the electric storage device temperature adjustment circuit, according to whether the electric storage device needs to be warmed up or cooled, which is determined on the basis of the temperature of the electric storage device detected by the electric storage device temperature sensor. 2. The hybrid construction machine according to claim 1, wherein the equipment cooling circuit has a cooling pump capable of switching between an actuated state in which the second coolant is introduced into the electric storage device temperature adjustment circuit and a non-actuated state in which the introduction of the second coolant into the electric storage device temperature adjustment circuit is stopped, andthe control means:(A) sets the warm-up switching valve to the electric storage device warm-up position, sets the cooling pump to the non-actuated state, and sets the lead-out switching valve to the engine-side lead-out position in a state in which the electric storage device needs to be warmed up; and(B) sets the cooling pump to the actuated state, sets the warm-up switching valve to the electric storage device non-warm-up position, and sets the lead-out switching valve to the equipment-side lead-out position in a state in which the electric storage device needs cooling. 3. The hybrid construction machine according to claim 1, wherein the equipment cooling circuit has a cooling switching valve capable of switching between an electric storage device cooling position in which the second coolant is introduced into the electric storage device temperature adjustment circuit and an electric storage device non-cooling position in which the introduction of the second coolant into the electric storage device temperature adjustment circuit is stopped, andthe control means:(A) sets the warm-up switching valve to the electric storage device warm-up position, sets the cooling switching valve to the electric storage device non-cooling position, and sets the lead-out switching valve to the engine-side lead-out position in a state in which the electric storage device needs to be warmed up; and(B) sets the cooling switching valve to the electric storage device cooling position, sets the warm-up switching valve to the electric storage device non-warm-up position, and sets the lead-out switching valve to the equipment-side lead-out position in a state in which the electric storage device needs cooling. 4. The hybrid construction machine according to claim 3, wherein the equipment cooling circuit has an equipment-side bypass circuit for circulating the second coolant only in the equipment cooling circuit, without passing the second coolant through the electric storage device temperature adjustment circuit, andthe cooling switching valve supplies the second coolant to the electric storage device temperature adjustment circuit in the electric storage device cooling position, and supplies the second coolant to the equipment-side bypass circuit in the electric storage device non-cooling position. 5. The hybrid construction machine according to claim 4, further comprising an equipment temperature sensor that detects a temperature of the equipment that needs cooling, and supplies the detected temperature to the control means, wherein the equipment cooling circuit has a cooling pump capable of switching between an actuated state in which the second coolant is supplied to the cooling switching valve and a non-actuated state in which the supply of the second coolant to the cooling switching valve is stopped, andthe control means sets the cooling switching valve to the electric storage device non-cooling position and actuates the cooling pump so that the warming up of the electric storage device and cooling of the equipment that needs cooling are performed in parallel when it is determined that the electric storage device needs to be warmed up and cooling of the equipment that needs cooling is required on the basis of the temperature of the electric storage device and the temperature of the equipment that needs cooling that are detected by the electric storage device temperature sensor and the equipment temperature sensor, respectively. 6. The hybrid construction machine according to claim 1, wherein the engine cooling circuit has an engine-side bypass circuit that circulates the first coolant only in the engine cooling circuit, without passing the first coolant through the electric storage device temperature adjustment circuit, andthe warm-up switching valve supplies the first coolant to the electric storage device temperature adjustment circuit in the electric storage device warm-up position, and supplies the first coolant to the engine-side bypass circuit in the electric storage device non-warm-up position. 7. The hybrid construction machine according to claim 1, further comprising a water temperature sensor detecting a temperature of the first coolant, wherein the control means determines that the electric storage device needs to be warmed up when the temperature of the electric storage device is lower than a preset temperature and the temperature of the first coolant detected by the water temperature sensor is higher than a preset temperature. 8. The hybrid construction machine according to claim 1, wherein the equipment cooling circuit has a heat exchanger for cooling the second coolant,the equipment that needs cooling is provided in plurality in the equipment cooling circuit, andthe plurality of units of the equipment that needs cooling is arranged in ascending order of upper limit value of the appropriate temperature thereof, from an outlet side of the heat exchanger. 9. The hybrid construction machine according to claim 1, wherein the electric storage device temperature adjustment circuit has a urea water tank constituting an exhaust gas purification system of the engine.