Under the principles of not to change the main structure,it proposed a measure of improving the bumper and energy absorption zone to improve vehicle crash safety performance and supplied a refer.

The design of the buffer absorbing energy type in clined well catcher monitored by photoelectricity;

The operation principle of an extendable and retractable crash energy absorbing device was introduced.

A low-loss snubber for push-pull inverters and its effect to power circuits;