Patent GB-1404445-A (GB)
Title: System for remote starting and stopping of diesel engines
IPC: F02N11/08
Filed: 1974-03-08
Abstract: 1404445 Stopping diesel engines J C BUCHER 8 March 1974 10529/74 Heading F1K [Also in Division H2] A system for controlling the starting and stopping operations of a diesel engine from remote locations comprises means for starting the engine span receipt in the system of an engine start signal together with means for stopping the engine by cutting off the fuel supply thereto upon the occurrence of a number of predetermined events. A momentary start signal from a remote location is applied to a terminal RECEIVER OUPUT when it is desired to start the diesel engine which turns on a transistor Q5 and subsequently a transistor Q12. Relay Kl is energized closing contact K1 to apply a potential BAT from a battery to a line d and, by way of a potential divider R16, R17 to a line 60 feeding a number of timing devices U 1 -U 6 . At the same time a relay K3 energizes momentarily to close contacts K3A, K3B which causes momentary energization of fuel solenoid 1 by way of a contact K4 to feed fuel to the engine prior to starting thereof. After a predetermined time and by a timing device U 1  a transistor Q6 turns on and hence a transistor Q2 wherefrom a relay K5 energizes to close contact K5 which causes ether to be supplied to the engine or glow plugs to be energized. Conduction of transistor Q2 causes turn of a thyristor SCRI which energizes :relay K4 to change over contact K4 to supply any accessories associated with the engine and to deenergize the fuel solenoid 1. Turn on of transistor Q2 also initiates operation of a timing device U4 which after a predetermined period causes turn on of a transistor Q13 and hence transistor Q8 to energize relay K2 and closure of contact K2 energizes the starter solenoid to start the engine. After the engine starts an output appears at the generator terminal ALT which breaks down a Zener diode D9 to turn on a transistor Q9. A  signal is thus transmitted to timing device U 1  by a line i whereupon device U 1  goes off and hence transistors Q6, Q2, timing device U 4 , transistors Q13, Q8 so de-energizing relays K5, K2 to place the starting system in the original state. The accessories remain supplied since the thyristor SCRI remains on and relay K4 remains energized. Diodes D4, D15 and resistors R4, R26 are associated with the timing devices U 1 , U 4  so that should the engine start momentarily and then stop, the system functions to restart the engine for a predetermined period. The system is further provided with mechanism to stop the engine in the event of undesired operation thereof and also includes a device for energizing and de-energizing auxiliary equipment at predetermined times after the relay K I has energized and the line 60 receiving a supply. A predetermined time thereafter a timing device U2 causes conduction of transistor Q7 and hence transistor Q3 to energize relay K6 to close contact K6 to supply a terminal AUX. EQUIP. After a further predetermined time a timing device Us causes conduction of a transistor Q14 and hence a transistor Q4, the conduction of transistor Q14 causing de-energization of the device U2 and hence relay K6 and conduction of transistor R4 causing the device U 5  to remain energized. Timing devices U 3 , U 7  form a mechanism to stop the engine in predetermined time after the starting thereof. A predetermined time after the transistor Q4 turns on the device U3 causes conduction of transistor Q15 which turns off transistor Q12 via line c and resistor R24 whereby relay K1 is de-energized and the supply to line 60 removed. When the transistor Q12  turns off a transistor Q18 turns on and device U 7  energizes. Thus a transistor Q17 turns on and relay K4 is energized to change over contact K4. Relay K3 also energizes to close contacts K3A, K3B whereby fuel solenoid 2 is energized to shut off the fuel feed to the engine. Energization of the device U 7  causes a thyristor SCR2 to conduct which turns off transistor Q18 to de-energize the relays K3, K4 such that the system is shut down. A device for detection of undesired operation of the system includes the timing device U 6  which turns on transistor Q15 to shut down the system should the device U6 receive a signal indicating that a starting operation has persisted for an undesirable time, should the auxiliary equipment fail to be de-energized or should the fuel solenoid 1 or starter solenoid be energized whilst the engine is running. The system also shuts clown, by way of transistors Q10, Q11 should a door be opened, the brake applied, an auxiliary device, such as a thermostat, operate or the generator fail to provide a signal at the terminal ALT. The system may be shut down remotely by applying a signal at the RECEIVER OUTPUT terminal whilst the engine is running.