ECV controls the discharge of the Variable Compressor of the cooling cycle of the automobile A/C system. ECV receives the electrical signal [0-1.0A] from ECU and supplies of the flow (refrigerant) of discharge pressure [Pd] to the swashplate control case by proportional control using the suction pressure[Ps] / discharge pressure[Pd] of the refrigerant inside the compressor. We are proud to launch a structure-optimized and miniaturized cost-reduction model, which adopts 4-way method securing the Pc->Ps pathway to prevent the delay of initial activation.
ECV（External Control Valve)
ECV receives the current of 0-1 [A] from the vehicle ECU and earns the forward driving force from the magnetic field formed by the solenoid coil. It also obtains the driving force in the reverse direction from the restoring force of the plunger spring, bellows and bellows spring. At this time, Pd-> Pc, PC-> Ps flow is controlled by the control of the valve displacement in accordance with the current (0-1 A) through an appropriate combination of magnetic field by solenoid, bellows and spring force.
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Operation characteristics |
Requirements : Variation amount shall be within ±0.03 Mpa after reliability evaluation |
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Current [A] at Pd=1.0 MPaG |
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Without diode |
0 |
0.26 |
0.42 |
0.52 |
0.61 |
0.68 |
0.75 |
0.81 |
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Ps(upper) |
- |
0.37 |
0.303 |
0.254 |
0.21 |
0.175 |
0.146 |
0.123 |
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Ps(lower) |
0.55 |
0.32 |
0.228 |
0.176 |
0.13 |
0.095 |
- |
- |
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Flow rate characteristics (Pd→ Pc) |
Conditions : Pd=1.03MPaG, Ps released to atmosphere |
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Requirements : Air flow to Pc shall be 200L/min or more |
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Flow rate characteristics (Pc→ Ps) |
Conditions : Pc=0.1MPa, Pd= Atmospheric pressure, Isol = 1.4A |
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Requirements : 40L/min or more |
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Valve leakage (Pd→ Pc) |
Conditions : Pd=1.03MPaG, Ps released to atmosphere, Isol = 1.4A |
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Requirements : Air flow to Pc shall be 2L/min or less |
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Valve leakage (Pd→ Ps) |
Conditions : Pd=1.03MPaG, Ps released to atmosphere, Isol = 1.4A |
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Requirements : Air flow to Pc shall be 5L/min or less |
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Valve leakage (Pc → Ps) |
Conditions : Pc=0.1MPaG, Pd Atmospheric Pressure, Isol = 0A |
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Requirements : 2L/min or less |
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Insulation resistance |
Conditions : Applying AC 500V between terminal and body for 1 min. |
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Requirements : 10㏁ or more |
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Voltage resistance |
Conditions : Applying AC 500V between terminal and body for 1 min. |
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Requirements : No abnormality |
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Noise |
Conditions : Ps = 0~0.5 MPaG, Isol = 0.45A |
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Requirements : 64dB max @ 50mm |
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