Electro-hydraulic control including blocking features for mulit-speed automatic transmission

A control for a multi-speed vehicle transmission, comprising:

• a pressure control subassembly, comprising a plurality of pressure control valves including a first pressure control valve, a first electrohydraulic actuator operably coupled to the first control valve, a second pressure control valve, and a second electrohydraulic actuator operably coupled to the second pressure control valve, the first electrohydraulic actuator actuatable to apply a first torque transmitting mechanism of the transmission,
• a shift valve subassembly, comprising a plurality of shift valves including a first shift valve and a first pressure switch operably coupled to the first shift valve, and
• means for blocking activation of the first pressure control valve unless the first pressure switch is activated,
• wherein the means for blocking activation of the first pressure control valve selectively blocks application of the first torque transmitting mechanism when the transmission is in a non-forward speed ratio, and wherein the means for blocking activation of the pressure control valve prevents the first torque transmitting mechanism from being applied both when the first electrohydraulic actuator is actuated and when the first electrohydraulic actuator is not actuated.

A control for a multi-speed vehicle transmission, comprising:

• a pressure control subassembly, comprising a plurality of pressure control valves including a first pressure control valve, a first electrohydraulic actuator operably coupled to the first control valve, a second pressure control valve, and a second electrohydraulic actuator operably coupled to the second pressure control valve,
• a shift valve subassembly, comprising a plurality of shift valves including first, second, and third shift valves, and a first pressure switch operably coupled to the first shift valve, and
• means for blocking activation of the first pressure control valve unless the first pressure switch is activated,
• wherein the pressure control subassembly and the shift valve subassembly are in fluid communication with a plurality of selectively engageable torque transmitting mechanisms of the transmission such that at least one of the electrohydraulic actuators is actuatable to selectively engage a first torque transmitting mechanism, and the means for blocking activation of the first pressure control valve selectively blocks engagement of the first torque transmitting mechanism in a non-forward speed ratio of the transmission both when the at least one of the electrohydraulic actuators is actuated and when the at least one of the electrohydraulic actuators is not actuated.