Split type internal combustion engine

Claim 1

An internal combustion engine comprising: (a) first and second cylinder units each including at least one cylinder; (b) an intake manifold divided into first and second intake passages leading to said first and second cylinder units, respectively, said second intake passage having therein a stop valve; (c) an EGR passage for introducing exhaust gases into said second intake passage, said EGR passage having therein an EGR Valve; (d) control means for providing a first control signal and disabling said second cylinder unit when the engine load is below a predetermined value, said control means providing a second control signal under high load conditions; (e) an EGR valve actuator for operating said EGR Valve, said EGR Valve actuator normally closing said EGR Valve and opening the same in response to a first drive signal; (f) a stop valve actuator for operating said stop valve, said stop valve actuator normally opening said stop valve and closing the same in response to a second drive signal; and (g) valve drive means responsive to the first control signal for generating the second drive signal immediately and the first drive signal with a first delay predetermined to ensure that said EGR valve opens after said stop valve closed, said valve drive means responsive to the second control signal for stopping the first drive signal immediately and the second drive signal with a second delay predetermined to ensure that said stop valve opens just after said EGR Valve closes.