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Find helpful information on Citroen Gearbox Models here:

Citroen C3 Gearbox
Citroen C4 Gearbox
Citroen Dispatch Gearbox
Citroen Xantia Gearbox
Citroen Xsara Gearbox

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Citroens Semi-automatic transmission, or also known as clutchless manual transmission, automated manual transmission, e-gear, or paddle shift gearbox is a system which uses electronic sensors, processors and actuators to do gear shifts on the command of the driver. This removes the need for a clutch pedal which the driver otherwise needs to depress before making a gear change, since the clutch itself is actuated by electronic equipment which can synchronise the timing and torque required to make gear shifts quick and smooth. The system was designed by European automobile manufacturers to provide a better driving experience, especially in cities where congestion frequently causes stop-and-go traffic patterns.

Citroen Gearbox Operations

In standard mass-production automobiles, the gear lever appears similar to manual shifts, except that the gear stick only moves forward and backward to shift into higher and lower gears, instead of the traditional H-pattern. The Bugatti Veyron uses this approach for its 8-speed transmission. In Formula One, the system is adapted to fit onto the steering wheel in the form of two paddles; depressing the right paddle shifts into a higher gear, while depressing the left paddle shifts into a lower one. Numerous road cars have inherited the same mechanism.
Hall effect sensors sense the direction of requested shift, and this input, together with a sensor in the gear box which senses the current speed and gear selected, feeds into a central processing unit. This unit then determines the optimal timing and torque required for a smooth clutch engagement, based on input from these two sensors as well as other factors, such as engine rotation, the Electronic Stability Program, air conditioner and dashboard instruments.
The central processing unit powers a hydro-mechanical unit to either engage or disengage the clutch, which is kept in close synchronization with the gear-shifting action the driver has started. The hydro-mechanical unit contains a servomotor coupled to a gear arrangement for a linear actuator, which uses brake fluid from the braking system to impel a hydraulic cylinder to move the main clutch actuator.
The power of the system lies in the fact that electronic equipment can react much faster and more precisely than a human, and takes advantage of the precision of electronic signals to allow a complete clutch operation without the intervention of the driver.
For the needs of parking, reversing and neutralizing the transmission, the driver must engage both paddles at once, after this has been accomplished the car will prompt for one of the three options.
The clutch is really only needed to start the car. For a quicker upshift, the engine power can be cut, and the collar disengaged until the engine drops to the correct speed for the next gear. For the teeth of the collar to slide into the teeth of the rings not only the speed, but also the position must match. This needs sensors to measure not only the speed, but the positions of the teeth, and the throttle may need to opened softer or harder. The even faster shifting techniques like powershifting require a heavier gearbox or clutch or even a twin-clutch gearbox.

Citroën is one manufacturer that committed to semi automatic transmission. First appearing in 1955 on the Citroën DS, a hydraulic system was used to select gears and operate the conventional clutch using hydraulic servos. There was also a speed controller and idle speed step-up device, all hydraulically operated. This was a clutchless shifting with a single column mounted selector. The Citroën 2CV gained a device named 'Trafficlutch', a centrifugal clutch that enabled clutchless changes in the first two ratios only (for town driving). The DS's semi automatic transmission was nicknamed 'Citro-Matic' in the United States. Later, the manufacturer introduced optional semi automatic transmissions on their medium and large saloon and estate models in the 1970s; the Citroën GS and CX models had the option of 3 speed, semiautomatic transmission marketed as 'C matic'. This was simpler than the previous inasmuch as it used a floor mounted quadrant lever operating a contact breaker and conventional gear selector rods in series, a fluid coupling 'torque converter' and wet plate clutch were cut in and out of phase by an electro valve controlled by the contact breaker. This system was simple in that it dispensed with the former use of hydraulics to operate a clutch AND select the gear ratios. Citroën semi automatic transmission of this era made no use of electronics, the entire gear selecting operation was carried out by simply moving the gear lever from one ratio to the next.

Some other Citroen vehicle:
Current vehicles include: - C1, C2, C3, C4, C5, C6, C8, C-Crosser, Berlingo, Picasso, Jumpy, Jumper, Xsara Picasso