Pressure modulating clutch control assembly

A pressure modulating clutch control assembly, comprising:

• a valve assembly in fluid communication with a clutch device;
• a pressure modulation assembly in fluid communication with the valve assembly, the valve assembly and the pressure modulation assembly being configured to function cooperatively to apply a clutch pressure to the clutch device in a series of stages, including:
• a clutch fill stage, in which the clutch pressure applied to the clutch device increases from a standby pressure level to a touch-up pressure level at a first unmodulated rate,
• a pressure modulation stage, in which the clutch pressure applied to the clutch device increases from the touch-up pressure level to a fully-engaged pressure level at a modulated rate, and
• a maximum pressurization stage, in which the clutch pressure applied to the clutch device increases from the fully-engaged pressure level to a maximum pressure level at a second unmodulated rate;
• and
• a modular relief valve in fluid communication with the valve assembly and the pressure modulation assembly, the modular relief valve configured to:
• facilitate a hydraulic feedback loop between the valve assembly and the pressure modulation assembly, such that an increase in a modulating pressure of the pressure modulation assembly causes a proportional increase to the clutch pressure in a continuous cycle until the clutch pressure reaches the maximum pressure level, and
• when the clutch pressure reaches the maximum pressure level, relieve the valve assembly, such that the clutch pressure applied to the clutch device is not allowed to exceed the maximum pressure level.

A pressure modulating clutch control assembly, comprising:

• a valve assembly in fluid communication with a clutch device and including a manually-actuated clutch valve, an electrohydraulic clutch valve, and a selector valve operative to selectively activate or deactivate the manually-actuated clutch valve and the electrohydraulic clutch valve;
• and
• a pressure modulation assembly,
• wherein, when either the manually-actuated clutch valve or the electrohydraulic clutch valve is activated by the selector valve, the valve assembly and the pressure modulation assembly function cooperatively to apply a clutch pressure to the clutch device and modulate the clutch pressure applied to the clutch device.