Hydraulic control apparatus and an automatic transmission control system
AssigneeAisin Seiki Kabushiki Kaisha
InventorSuguru Futamura
Life of this patent
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Abstract
A hydraulic control apparatus includes a linear solenoid valve for outputting modulated pressure in response to electric current applied to the linear solenoid valve, a plurality of control valves outputting control pressure in response to the modulated pressure introduced from the linear solenoid valve, a shift valve for switching between the control valves to which is to be introduced the modulated pressure in response to hydraulic pressure supplied to the shift valve, and an ON-OFF solenoid valve for switching the supply of the hydraulic pressure to the shift valve in response to electric current applied to the ON-OFF solenoid valve.
Claims9
A hydraulic control apparatus comprising:
- a linear solenoid valve for outputting modulated pressure in response to electric current applied to the linear solenoid valve;
- plural control valves outputting control pressure in response to the modulated pressure introduced from the linear solenoid valve;
- a shift valve for switching the control valves to which is to be introduced the modulated pressure in response to hydraulic pressure supplied to the shift valve;
- and
- an ON-OFF solenoid valve switching supply of the hydraulic pressure to the shift valve in response to electric current applied to the ON-OFF solenoid valve.
An automatic transmission control system comprising:
- a linear solenoid valve for outputting modulated pressure in response to electric current applied to the linear solenoid valve;
- plural control valves outputting control pressure in response to the modulated pressure introduced from the linear solenoid valve;
- plural friction engaging elements to be engaged and disengaged in different combinations based on the control pressure to change a shift stage;
- a shift valve for switching the control valves to which is to be introduced the modulated pressure in response to hydraulic pressure supplied to the shift valve to switch the friction engaging elements to which the control pressure is supplied;
- and
- an ON-OFF solenoid valve switching supply of the hydraulic pressure to the shift valve in response to electric current applied to the ON-OFF solenoid valve.
An automatic transmission control system comprising:
- a linear solenoid valve for outputting modulated pressure in response to electric current applied to the linear solenoid valve;
- a start control valve and a lock-up control valve which output control pressure in response to the modulated pressure introduced from the linear solenoid valve;
- plural friction engaging elements to be engaged and disengaged in different combinations based on the control pressure to change a shift stage;
- a shift valve operable in response to hydraulic pressure supplied to the shift valve for switching between introducing the modulated pressure to the start control valve and introducing the modulated pressure to the lock-up control valve to switch the friction engaging elements to which the control pressure is supplied;
- and
- an ON-OFF solenoid valve switching supply of the hydraulic pressure to the shift valve in response to electric current applied to the ON-OFF solenoid valve.
Dependencies are inferred from the claim text.