{
  "$type": "site.standard.document",
  "description": "A method of controlling hydraulic shift clutch actuators in an automatic speed change power transmission of the type having an electronic controller (TCU) for energizing a solenoid operated valve to control each hydraulic clutch actuator. A pressure sensor is disposed to sense the hydraulic…",
  "path": "/patents/1085962",
  "publishedAt": "2004-06-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T13/46",
    "EATON CORP [US]"
  ],
  "textContent": "A method of controlling hydraulic shift clutch actuators in an automatic speed change power transmission of the type having an electronic controller (TCU) for energizing a solenoid operated valve to control each hydraulic clutch actuator. A pressure sensor is disposed to sense the hydraulic pressure (P s ) to each clutch actuator and provides an electrical signal to the TCU which also receives a clutch pressure command signal (P c ) from the vehicle powertrain computer. The TCU computes the differential P = P c - P s and determines the valve energization current I E from known relationships between P and the percentage of maximum valve current and repeats the process in real time to adjust I E until P is negligible.",
  "title": "Closed loop control of shifting clutch actuators in an automatic speed change transmission"
}