  A $q$-covering design $\mathbb{C}_q(n, k, r)$, $k \ge r$, is a collection
$\mathcal X$ of $(k-1)$-spaces of $\mathrm{PG}(n-1, q)$ such that every
$(r-1)$-space of $\mathrm{PG}(n-1, q)$ is contained in at least one element of
$\mathcal X$ . Let $\mathcal{C}_q(n, k, r)$ denote the minimum number of
$(k-1)$-spaces in a $q$-covering design $\mathbb{C}_q(n, k, r)$. In this paper
improved upper bounds on $\mathcal{C}_q(2n, 3, 2)$, $n \ge 4$,
$\mathcal{C}_q(3n + 8, 4, 2)$, $n \ge 0$, and $\mathcal{C}_q(2n,4,3)$, $n \ge
4$, are presented. The results are achieved by constructing the related
$q$-covering designs.
